Jump to content

Leaderboard


Popular Content

Showing content with the highest reputation since 09/20/20 in all areas

  1. 4 points
    For many years now I have been diving in the Mar Piccolo - Taranto (Italy) at all times of the year. I discovered this place 25 years ago thanks to the collaboration with a local scientific foundation and since then I have never missed an opportunity to return. In recent years, however, the summer temperature of the water reaches almost 30 degrees, creating great problems for the local fauna and flora. Many species move towards deeper waters and others, unable to move, end their cycle with a slow agony. I returned in these days and this little Mediterranean paradise is starting to revive.
  2. 3 points
    I would like to relay an incident I had Christmas Day 2016. I was in Ambergris Caye Belize for a holiday dive trip. It was my 34th dive trip to Belize. I arrived in Belize on 12-22-16. On 12-23 I did two dives on one of the more remote sites there. same thing the next day. On Christmas morning I did a single morning dive with the plan of spending Christmas with my wife. After getting back to the dock i started getting very very tired. I thought I would go back to my room and rest for a while. My condition continued to go down hill. Anyway, We decided to go to dinner and that I would just rest the balance of the evening. Things really went down from there. After arriving at the dinner location I was having problems walking. It was like I was drunk. after that I found that I could not urinate. This could be a big issue after a few beers. I was also having vision issues in my left eye. We blew off the dinner and returned to our room to rest for the night. Around 9:00 PM I used my Sat phone to call Duke University in NC. They manage DAN. I spoke with a tech and then a doctor who told me I was in crisis and required a medical evac. My dive computer data was downloaded and sent to Duke. Wow the day just keeps getting better. Dan said they would get a specially equipped aircraft flown down to get me and medivac me to Miami. When I told them that I was in Belize they were happy as they had just opened a new chamber there a couple of months before my issue. I was told that they were assembling a medical team and they would pick me up at my hotel in 15 min. 10 mins later there was a knock at my door by the med team. They took me to the chamber where i was examined by the doctor. He told me I was suffering Neurological DCS stage 2. very serious. As they were loading me in the chamber the doctor told my wife, You husband is in critical condition and we will do the best we can for him. She freaked out of course. So Christmas night I spent 6 hours in the chamber with a nurse. The following morning I required another 4 1/2 hour treatment. After that the rest of the vaca was just hanging out. stay out of the sun and no beer. The moral of the story is. Buy your Dan insurance. Dan cost me $85.00 a year. They covered all expenses for my injury and medical treatments. They are dedicated to dive medicine and have an outstanding crew backed by state of the art research at Duke. I met a man who also had a DCS issue while in Belize. I was going in to thank the staff for saving my life and for their kindness. The man I met was going in to pay far his 4 hour chamber treatment with staff. He had to put $22000.00 US dollars on his credit card because he did not have the DAN insurance. My bill without the DAN ins would have been over $44000.00 THANK YOU DAN AND DUKE UNIVERSITY. Everyone be safe and use the DAN insurance. This incident has forced me to stop diving. spinal cord injury as a result. I could most likely continue diving but could not place my wife in that situation again. Best wishes to All Bryan
  3. 3 points
    The Zeus faber or John Dory is certainly one of the most representative fish of the Mediterranean mesophotic zone. The John Dory has a high laterally compressed body: it's so thin it can hardly be seen from the front. The large eyes at the front of the head provide it with the binocular vision and depth perception it needs to catch prey. It hides among gorgonians and catches prey by stalking it, then extending its jaw forward in a tube-like structure to suck the fish in. I am always hypnotized by the ability of this fish to advance while remaining with the body motionless while moving only the anal and dorsal fins with an infinite vibration. These two specimens were filmed on Giannutri Island at a depth of 75 meters (250 ft.). In the central clip (00:48) there are 3 other mesophotic citizens: A basket star (Astrospartus mediterraneus) , a melon sea urchin (Echinus melo) and some colonies of red coral (Corallium rubrum). ------------------------------------------------------ Audio track: Antigravity 2 by Dan Skinner & Adam Skinner - via Audio Network Cover photo: Marco Bartolomucci
  4. 2 points
    Hi, Tinman: The first person to contact me was the first to send me the shipping costs, but not until 5 days after the notice had been posted. Everybody else had those days to contact me and send the shipping cost. Day before yesterday I shipped him the handles, they are gone. Sorry for any inconvenience or disappointment but everybody else had plenty of time to act. The funny thing is that some months ago I put these same handles up for sale at about 1/4 of their market value, and nobody was interested. But when they were offered Free to Good Diver, several persons have expressed strong feelings and feel victimized because somebody else was first. My decision was based on the simple First Come - First Served. Over and out.
  5. 2 points
    I am happy to share my latest video-interview with Max Ammer, the pioneer of diving in Raja Ampat, West Papua in Indonesia. About 30 years ago, Max came to Raja Ampat in a search of World War II relics. This is a story about how Max built the very first dive resort in Raja Ampat - Kri Eco Resort, and later - Sorido Bay Resort, about conservation efforts of Max and his partners, training local people and building the very first electrical boat in Raja Ampat. Video is shot with Sony NX80, and a few clips with Sony 7Rii. ENJOY. https://youtu.be/vcmAxOhLgEM
  6. 2 points
  7. 1 point
    Here are the silky sharks swarming the bait near the surface in Cuba.
  8. 1 point
    I don't know where this idea came from on the internet, that it's the professionals who are constantly chasing the latest and greatest. It's amateurs with too much money on their hands. Professional wildlife photographers have probably been locked into their respective systems (nikon/canon dslr) for years because you don't just replace your long tele glass easily. When you look at some of the (very few) wildlife youtubers (Morten Hilmer comes to mind) they don't carry zoom lenses. They use primes because zoom lenses at that range have only ever been consumer grade. It's the same thing in mu43 too with the 300mm prime and the 100-400 zoom which is nowhere near the same quality. If the 150-400 f4.5 TC ever comes out that will be an actual Pro Telezoom for mu43 and something that really no other system offers. The usual setup for a wildlife photographer seems to be one 600mm/800mm prime (because most of the time you'll be zoomed in all the way to the long end anyway) and then something like a 100-400mm zoom (for when stuff actually comes closer). Cropping from twice the resolution also gets you nowhere near mu43 reach. You would need four times the resolution for that. Personally I find that the kind of shots that become accessible only because we can carry smaller gear anywhere is much more important than some marginal image quality gains that only become apparent when pixel peeping. You can easily print 40x60cm from the 20mp mu43 sensor. Tell me, when is the last time you printed larger?
  9. 1 point
    Sony A7sii was used by the Blue Planet II team: https://wetpixel.com/articles/interview-dan-beecham-on-underwater-filmmaking-and-blue-planet-2 and used in many new BBC movies for low light situations: I think the new version is even better and probably not a bad choice for non professionals.
  10. 1 point
    Pretty good pic for a 10 year old camera. Just shows its the photographer not the latest and greatist camera which takes the pic. I use an aquatica housing with a nikon d60 and ikelite AI strobe and a nikonos sb 105 as a slave. The strobes are 30 years old. No ttl mannual setting only. Camera does not see strobe. I guess at settings but digital is very easy compared to film.I have seen on many liveaboards people with the latest and greatist housing don't know how to work it or the camera. Jim Church from the nikonos film camera days. One of his sayings KISS- Keep It Simple Stupid. reefscenics.smugmug.com
  11. 1 point
    If you mean TTL board for Sony A7-A9, the hardwire was upgraded even in spring this year. Probably you have a last version hardwire. Anyway, let's contact by e-mail to specify some technical details.
  12. 1 point
    Hi Arnau, Good light, but .... Model position is not the best, even he is touching the wall indicating bad buoyancy, and for i.e. judge contest point of view, this photo even would be penalized... My opinion....
  13. 1 point
  14. 1 point
  15. 1 point
    As Algwyn observes, coiling the fiber optic cables is not useful, as the coil floats about, is in the way, and can get caught; in fact, the coils waste cable as they are not necessary at all. All I do is thread the cable thru the holes in my strobe arms, and wind any excess around the clamps and arms. That way the cable is secure, out of harms way and well organized. (I had described this approach in this thread, on Sept 21, 2017).
  16. 1 point
    I guess that the main benefit of coiled fiber optic cables is that they may be adjusted to different arms setups. I find the coiling more bothersome than convenient when installing arms. With cheap fiber optic cables, there is no need to coil: just cut a cable length for each arm setup combination. Regulary fiber optic cables loose a lot of light when they are bent, so coiling them is not a great idea, unless you are using these multicore fiber cables, which are not so easy to get.
  17. 1 point
    That observation is how fiber optics work. If you look at the ESKA fibers for example, their 2 mm fiber has a minimum bend radius (0.5dB) of 80 mm or more than 3 inches. If you look at their 1 mm fiber the minimum bend radius is 25 mm or about an inch. If you look at the 613 core fibers (1 mm fiber diameter) the minimum bend radius is 1 mm, and for the 1.5 mm diameter fiber it is 3 mm. This means that it is easy to coil the multi-core stuff and that if you crimp a large diameter fiber it will stop transmitting. Certainly polishing of the ends (there are better ways than candles) will improve transmission. If you don't want coiled cables then large diameter fiber is fine. If you want them coiled then the multi-core stuff is easier to work with. YMMV Bill
  18. 1 point
    Hi, I'm new to wetpixel. I have both the A7r4 and A7s3 bodies. Been shooting UW video with a Sony RX100 Vii with Nauticam housing for a year or more and plan to upgrade to theA7s3. When I talked with Nauticam 2 weeks ago they felt the Nauticam housing for the A7r4 would not work with the A7s3 body. On a close visual inspection the Video trigger on the A7s3 looks to be ever so slightly larger than the C1 button (Same location) on the A7r4. It really looks like the 2 bodies are the same size, but I don't really have a way to measure to the degree I think is needed for assurances. Also the ports on the left side are different on each camera body if you were going to connect something external that can be a factor. Anyway I'm about to pull the trigger on the Nauticam A7s3 housing as soon as I get comfortable on the lens and port configuration that suits me best. When I do have the housing (Available but on backorder for 2-3 weeks) I will be able to physically put the bodies into the A7s3 housing and see what shakes.
  19. 1 point
    Spoken for, these two handles are on their way to their new home. Thank you for your interest!
  20. 1 point
    I was thinking of casting resin around a snooker ball to make a plastic ball head, then realised I have any number of ball joints in flash arms. I bought a cheap tripod from a charity shop. cut off the pan/tilt head and ground down part of a TLC arm to glue into the tube. I removed the lower leg section and glued rubber feet on. I put a metal hook into the base of the column which I can tension to a rubber lever-suction cup attached to a pool tile with bungee cord. (In the sea you would need weights.) I cut a 6mm aluminium plate and drilled clearance holes for the 1/4" Whitworth machine screw and the 5mm metric screws in the corners of the plate, (for a NA-D800 housing). An 8mm countersunk machine screw and epoxy secured the 1" ball fitting to the plate. Bits of TIG rod silver soldered to the screws allows me to attach the plate without tools.
  21. 1 point
    I agree it is very sad, but I don’t think it is the end. OM-D may well pull out of a lot of markets but may hang on in Japan. That was JIP’s model for Sony Vaio. Remember they are about to release a flagship (and expensive) 150-400 f4 Telephoto with built in teleconverter. The R&D is a sunk cost but why incur new variable costs for marketing and distribution? And if this move was just for the purpose of liquidation then why form a new company? Although Japanese business law may confer advantages for the new company for downsizing, redundancies, and tax. I’m fully invested in bodies, lenses, and housing. The format gives me advantages for macro and telephoto and the trade offs are acceptable for what I do. None of it stopped working with this announcement so I’ll keep using all my gear for a long time to come. If there are great deals coming then bring them on!
  22. 1 point
    Thanks for watching and your comments. Raja Ampat is a fantastic place: the best of the best!
  23. 1 point
    Elphinstone :-)
  24. 1 point
  25. 1 point
    Sorry for the confusion: I meant the difference fro Sony 6600 (APS-C) to Oly EM1II, that I have (MFT). In my case the 8-15mm performs best without teleconverter, that is not required for MFT (for APS-C, the 1.4x converter gives similar angles of view as 1x on MFT). Already at 8mm one gets a 180 degree diagonal fisheye without vignetting and longer focal lengths allow to zoom in further. I have also the Kenko 1.4x, that gives more narrow angles of view. Optically I cannot see degradation. AF becomes slower, sometime it does not work, especially when there is less light (deeper or sun is not shining). I also tested the Kenko 2x teleconverter with Canon 8-15mm on EM1II, that would provide perfect angles of view for a future FF setup: the images become very soft and AF very unreliable, almost impossible - so the 2x converter is unfortunately not an option... Great work - I did not know that macro-diopters can be used with domeports and still provide good IQ (this was the confusion and curiosity from my side). It would be great if you could provide a special tread on domeport/macro/diopter with sample photos, this sounds interesting.. Wolfgang
  26. 1 point
    Evening folks, been a while since I made a video, hope you enjoy. Little Wild Things (watch in 1080p if poss, if not Youtube compression isn't the best) Thanks.
  27. 1 point
    Hello everybody, A little introduction, I am into video making a couple of years now, and we added diving to our hobbies since last year. Did OW and AOW, and this year our first dive-oriented holiday in Marsa Alam, Egypt. We had some back luck with the weather and therefore some murky water here and there, but overall Egypt was a lovely place to dive. I am kinda experienced with camera's, but this was my first time bringing it underwater, so still figuring some things out. Anyway, looking forward to some constructive feedback! Thanks in advance fore watching and replying! I Used a Sony A6500, with 16-50mm lens in the Fantasea 6500V2 housing, and Sealife Duo 5000 lighting. Greetings! Roberto
  28. 1 point
    Hi David, Thank you very much for your effort of replying and your feedback! Will look into it next time!
  29. 1 point
    Nice video indeed. I really liked it. Maybe the color grading a little far reddish in several shots but nice. On scuba musical videos I would stay within the 3 minute limits. Daje!
  30. 1 point
    Great video and interesting story! Raja Ampat is definetely on our list! :)
  31. 1 point
    I do know someone selling one, PM me your email address and I can give it to him if you like. Almost unused and bought from us at Nauticam UK last year.
  32. 1 point
    Thanks for sharing, I have wonderful memories of R4 and this brought many of them back. Max has had such an interesting life
  33. 1 point
    This would be so tempting as I still prefer using DSLR's over any current MILC.
  34. 1 point
  35. 1 point
    Fantastic! My favourite fish (obviously)!
  36. 1 point
    I have always taken photos and video before the underwater but with covid-19 I have gone to shoot much more on land out of cancelled diving trips and other trips Majority of us have a fisheye and a macro lens and some have also a mid zoom. Unfortunately underwater imaging is not relying on fast lenses so most of your traditional photography is not matching the equipment, besides with covid-19 travel restrictions make it harder to go around and shoot landscapes So what can you do if you have a macro lens and a wide angle lens? One interesting option are star trails that unless you are in the centre of a very bright city are possible almost anywhere from your backyard. A fast wide angle not too wide is preferred but you can even get by with fisheye Home Sweet Home by Interceptor121, on Flickr Macro gives you access to flowers or bugs You can also use macro lenses for abstract I hope this is inspiring those that are stuck at home and have their equipment collecting dust to try something new
  37. 1 point
  38. 1 point
    Thank you two, had not been so lucky, so some floodings during the years... And thoughts that are not 100% on your line... My first was a S&S DX1 on my first asia trip. Third day of 3 weeks.... My fault, catched the secure ribbon of the front cap between oring and back door... Exact behind the lock buckle... Didn see it, murphy was on board, was a dive there you had to swim 10 minutes from boat to site, national park... When i started decenting, i saw it, small bubbles inside, so much too late... Did the dive, as soon as back on the boat rinsed everything in sweet water, but much too late. So back in the hotel, i through everything in sweetwater again, but camera was gone, battery corroded and it was 2008, no laptop or storage device with us, the 2 days before gone... Somehow i keept the SD card, and back home, it was dead. But it was laying in the shelf, and after 8 or 9 months, mistakly was used again. And there were pics on it. More the 90& were ok! So as Alex said, keep your dead gear and keep trying!!! As a Hugyfot user of the older generations, using one of the first Nikon D300 housing, i had 3 floods. One was a broken snap ring, during a dive, again 3rd day, in Thailand, during the dive suddenly one of the buttons came out... Catched it, and pressed my thumb on the hole until the end of the dive .... The button i put in a jacket pocket with zipper, was easy to repair afterwards at home. Was only a minor water entry, but because i kept the camera horizontal, it was too much.. Some water came to the card slot, and it quitted working. All camera was ok, but no card accepted... Dont ask... So, thank Alex for that, will help! The two others have been a construction issue of Hugyfot, that ended in introducing vaccum systems. The old housing generation was desinged to be a front and back part, holded together with two screws. No snap locks like other companies, only two screws with an allen key. What was great, because the housing was round shaped and so easy to hold... No unwiedly edges where you hold it. Backside was, that both times it was the second dive of the day, on boats, so my idea was that the temperature difference and the boat shaking startet loosing the screws... And thats the point against Alex theory, the problem appeared at the end of the dive. Starting was easy, everything worked fine. At the end of the dive, last meter to surface, after the safety stop, suddenly a curtain of bubbles came out of the seal area on top. Pressure that keept the two housing parts together was lost. So getting up was important, but with a dslr rigg, and not much air in the jacket because you want to be slow, it was a kicking event, until another diver came close enought to blew up my jacket. and as Alex said, keep the port downside. It was once a wide angle, these ports can take a lot of water, and the other was a macro, but with my Nikon 70 to 180mm micro zoom. There is some space to the port from the front element, since it is a old lens that neds it... Both times no losses. After that i thought about leaving Hugyfot, 3 times issues is not the best recommandation, and i got a new camera, Nikon D500, and from that model they changed to snap locks... But from history, the brought vaccum systems on the market, simply because they had a construction problem... So there couldbe a lot of different problems, its only important to know how to deal with them! And thanks for explaining that very good! So wish you allways a dry housing, Wolfgang
  39. 1 point
    I recently got into 3d printing and cad design. I printed some dome port protectors and gears out of flexible nylon. Also printed some rings to cover the lens info that can reflect off a port.
  40. 1 point
    Male cuttlefish can evaluate the likelihood of winning a fight by assessing their competition, according to a new study... Nikon D7000 f/8, 1/250, 7mm, ISO 250 Housing Nauticam
  41. 1 point
    Hi, I recently got an AO Cooler bag: https://aocoolers.com/24-pack-carbon-cooler-black.html I got the black carbon model because it is very water repellent and dries really quickly. I typically just hose it down at the end of the day, then wipe it down dry. Salt seems to just slide off, did not notice any salt build up on the zippers. Used it for about 3 weeks out on fieldwork for my camera system. It worked well on the boat. For travel what I did was I bought a camera bag insert: https://fstopgear.com/products/icu/pro-icu-large So the cooler serves double duty as my camera bag during travel. I typically arrive at my destination and i can just pull out the camera insert and all my stuff is there. That camera insert stays in the hotel room nice and dry. Then I assemble my camera and just drop it in cooler bag and that serves as my wet bag which i can take onto the boat. Hope it helps Sent from my iPhone using Tapatalk
  42. 1 point
    @oneyellowtang No doubt that such technology can offer benefits not achievable otherwise. Where I work, we have access to devices with EVF’s that outperform what todays cameras offer and yet for certain applications, the OVF continues to handily outperform the EVF counterpart. There are needs for both. As for AI augmentation, there is a company with an EVF binocular that in theory could load data for say birds, such that on top of presenting you an image of the subject, it will also provide an identification. Is that the future of birding? I certainly hope not and I’m not even a birder. I too grab my kindle when I’m heading out on travel but when I have the time to read at home, I still prefer by far and away to read from a book. There are numerous studies indicating that comprehension and retention are higher when reading from printed pages than from a device. So while I love technology, I do realize that it has limitations as well and when it comes to more ‘artistic’ endeavors, technology can be a double edged sword. AI sky replacement in some of today’s photo editing software is becoming quite believable but I’d personally never use it and ‘look down’ upon its use. So while ‘change is inevitable’, we must realize that it is not always for the better. However, I’m not trying to change anyone else’s opinions just offering my view.
  43. 1 point
    last weekend we went dove the 'Flagpole' dive site in Hood canal, it is probably one of the best diving spot in that area, and behold, this easily wingspan 10 foot plus giant pacific octopus decided to come out of its den and say hi to us. absolutely once a life time experience for myself. shot on 1dx + retra strobs, WACP1 7-1 by Joe Hua, on Flickr 13-1 by Joe Hua, on Flickr 12-1 by Joe Hua, on Flickr 2-1 by Joe Hua, on Flickr 1-1 by Joe Hua, on Flickr
  44. 1 point
    Interesting article on one of my favorite non-scuba related sites. Enjoy! http://www.openculture.com/2020/09/the-first-underwater-portrait-in-the-history-of-photography-circa-1899.html Kind regards, Ajay.
  45. 1 point
    I think you need to consider overall that a 4.33 dome has a radius of 5 cm while a 140 dome is 7cm Most of the bulk of a lens depends on the extension used so at the end you are only getting 2cm closer it is not that much Yes a 4.33 dome is smaller but 140 is fine I have it and I don't see a major issue with the size is the weight that is a problem
  46. 1 point
    I have used the Canon 8-15 Fisheye for several years on Sony FF cameras from A7 II to A7R IV and with at least five different camera brands. I have also used the lens with the Metabones and Sigma MC 11 adapters which both work equally well. The idea of the lens is to give you a traditional full frame fisheye and a circular fisheye (360 degree) in one lens. Any of the zoom settings in between just cut off the top and bottom of the frame. On M43 you get a fisheye zoom range but you don't get the circular fisheye. I have used the lens with both optical glass and acrylic pome ports from 100mm to 230mm. As others have said you can also used the Sigma 15 fisheye with the Canon adapted. Nikon also has an excellent 8-15mm FF fisheye but alas the adapters for nikon AF on Sony don't work well. If you would like more information on using the Canon 8-15 with Sony go to uwpmag.com, back issues and you will find more than a dozen reviews where I used the lens.
  47. 1 point
    I dive with a Sony 6500 and Tokina 10-17 (canon fit) on a Sigma MC-11 adaptor (this is about 1/2 the price of the Metabones and the same size). I've had no issues with this set up, the Tokina is the go to lens for APS-C and the Sigma adpator works well with this lens. It also provides a much more flexible solution than the Sony 16mm. I hope this helps
  48. 1 point
    HI, Im selling my Hasselblad H38 Peterson Gates Underwater Housing for 903 SWC, 903SWC (Superwide). It's in excellent condition. The angle of view is so wide that one usually just points the housing, but I found the viewfinder useful as well. The dome is mint with no scratches. The housing has been used maybe 50 times at the most. Fantastic housing!! It was developed in collaboration by Lee Peterson at Marine Camera Distributors and Gates with Hasselblad. It was designed to optically match the Zeiss Biogon 38mmm on the 903 SWC Superwide and take full advantage of it's unique (non retrofocus) optical design. I enjoyed using it immensely. It's so well balanced, that it weighs only a few ounces underwater. Over the years, I've found myself using it less and less, so it's unfortunately time for it to go. The selling price was $5575.00 USD in 2005. And I believe 2005 was the when they stopped making them. This is super rare item. I can't find them anywhere online to make a price for selling. It comes with everything - new nuts and bold, o-rings and two light meters. one working and one for parts. I Have no idea of how to price and I have spoke to Hasselblad USA to find out and they response was wow!!!! how do you have one? they are so rare. I live on the Gold Coast Australia I have images if needed
  49. 1 point
    Cause I’m using the GH5s which lacks IBIS, I had to come up with a way to balance my rig to to make it feel like a traditional video cam rather than the DSLR restricted position. This setup up helps me avoid all types of roll, pitch and yow. It is not a final setup up but it is so balanced that I can let go of the camera midwater and it will just stay there :). I rely totally on the external monitor for all my needs: exposure/focus etc... I can adjust the camera vertically (lookup/down) by adjusting the DIY floors position.
  50. 1 point
    Geo, I think you'll be quite happy sticking to no picture profile for your Grand Cayman trip. You can acquire very nice footage in this mode underwater. The Cinegamma settings allow you a bit more control about how the camera records highlight and shadow information. Some of them will allow you to capture slightly more light-level gradations in the highlights or shadows areas of the image before those areas clip to pure white or pure black. That's the theory. It's not as much extra gradation as a log gamma curve (e.g. SLOG2 or SLOG3) would allow you to capture, but it's more than you get using the no picture profile settings. They also have the advantage of letting you use the Rec709 color space (which is the color space you'll be outputting your video in for TV/web use) rather than the SGAMUT color space that you're forced to use with SLOG. This means you won't have weird color shifts that you need to fix in post as you would with SLOG. In practice, there's some disadvantages and things to consider: You need to post-process your footage to get the best out of it. Like with SLOG, you're squeezing more dynamic range into the same 8 bits of luminance data. The camera records all light levels from 0 - 255, with 0 being black and 255 being white. Cinnegamas and SLOG give you the option to try to squeeze in 10 or 12 stops of dynamic range into those 255 levels, rather then the roughly 8 stops you get with no picture profile. This will end up producing a video file that has less contrast initially. So to get the same "pop" you'll need to boost the contrast in post processing. No picture profile lets you use the video files as is, without this extra step, so it's a distinct advantage if you have tight deadlines or you don't want to spend loads of time color correcting the footage. You trade detail in the midtones for extra detail in the shadows/highlights. Because you're squeezing in more information into the same 255 levels, you'll get less levels to represent the midtones -- which is usually where your subject is. So instead of having 255 levels to describe the black-to-white gradation of a manta's belly, for example, with cinnegamas you'll only get, say, 128, because the other 128 are now being used to record the gradations in the shadows of the coral the manta is hovering over, and in the sunrays. These are details you would otherwise lose clipping. So by choosing a cinnegama or slog profile, you're basically choosing to emphasize detail in the highlights and shadows at the expense of midtone detail. Now, there may be scenes where this is the right choice, but, overall, I think it's rare that you need more than 8 stops to showcase the underwater world well. Do you really need that much detail in your sunbursts? Or in the shadows? Or would you rather use that data to make your main subject look better? Personally, I'm ok with sacrificing a bit of detail in the highlights and shadows to get a picture with more contrast/pop with limited post-processing. Over the years, I've come to believe that a wide dynamic range is really not that important underwater, since we're often working with artificial light (strobes or torches) that fill in the details in the shadows. Does more dynamic range help? Sure it does, especially with careful post-processing to tone-map that dynamic range into the smaller space of you output format. But it has less visual impact than nice colors and nice contrast. To give you guys a visual reference for what I'm talking about, here is a short video with two scenes shot using no picture profile, cinegamma 1, cinegamma 2, cinegamma 4 and slog2, in that order. I took this footage yesterday with the A7RII set to UAWB, depth 3m, midday, good visibility. SLOG2 footage is at ISO800, F11. Other footage is at ISO200, F11. No post-processing was done. I also thew in a shot at the end to show what WB: Sunny looks like by comparison to UAWB. https://youtu.be/Ap84hmJ4gpQ As you can see, it's not a huge difference between No PP and Cinegamma 1, 2 and 4. SLOG does show a big difference, but that's because of the SGAMUT color space messing everything up. If there's any colorists out there that want to play with the footage to see if you can make the Cinegammas or SLOG look nicer than no picture profile, I'm happy to share it. It's about 144MB in h.264 1080p. If someone can suggest a web host, I can even put up the original 4k files.

Sponsors

Advertisements



  • Newsletter

    Want to keep up to date with all our latest news and information?
    Sign Up
×
×
  • Create New...