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Interceptor121

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Interceptor121 last won the day on November 10

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About Interceptor121

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    http://interceptor121.com

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    Male
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    Woburn Sands, UK

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    United Kingdom
  • Camera Model & Brand
    Panasonic GH5
  • Camera Housing
    Nauticam NA-GH5
  • Strobe/Lighting Model & Brand
    2x Sea and Sea YS-D2, 2x Inon Z240
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    Too many

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  1. John we are talking video here not stills so WB is required. I do not know what RAW is inside a camera like BMPCC 4K however I doubt it is uncompressed RAW and therefore white balance will certainly not hurt there either
  2. One of the issues when converting files between Lightroom and Photolab is that the colors are not retained. Apparently Photolab saves all color channel separately in a DNG while Lightroom does not. The conversion only works using TIFF however in this case I needed to process the raw file in photolab first as that is where I can alter the geometry corrections when I then get to lightroom and use DNG the colours go off so I am not able to reproduce anymore the same set up of the image I processed few months ago! For what concerns the image and the geometry correction there is what it seems a crop stronger in lightroom and to a lesser extent in the corrected photolab file, no crop in the uncorrected What I understand is happening here is as follows: 1. DSLR lenses have a profile for correction and you can decide as user if you want to apply it or not. Typically a DSLR wide angle lens of good quality has a distortion of 3.5% so in effect nobody corrects it and lightroom by default does not propose a correction even if a lens profile is available. 2. Mirrorless lenses have a smaller sensor and the error is higher than 5% (5.2% Panasonic 7-14 mm 6.6% Pana 8-18 7.2% Olympus 7-14) the manufacturers run a test on a grid and then put some parameters in the lens. This level of distortion IS visible on land images I will try and post some examples when I get back What lightroom does is to apply the correction parameters in the lens (you cannot disable) and then crop the edges and upscale the image. So even if you have full resolution of your camera the reality that it has lost around 2 Megapixels this is mostly in the corners that look badly The uncorrected image has those 2 megapixels more and if you were shooting a straight line you would see it is bent (i have done it and it looks horrid) underwater it is harder to see even if the lens has 6.6% distortion as in my example The corrected image from DxO looses less pixels than lightroom and still achieves a straight line what is good is that you can set the correction to 100% which is completely corrected or less all the way down to zero where you have all your pixels back depending on having or not straight lines in the image. So if you have them and it is important you correct them, if not you can leave uncorrected and keep the full sensor resolution generally it is not possible to really notice a 5-7% unless there is a straight line in the frame
  3. The metabones adapter Canon EF to Sony has no optical element is just a physical adapter to make sure the flange distance is the same. The person I met on the boat actually posted the pictures here on wetpixel this is the post As the Sony autofocus is great and @benignor says there is no difference using the metabones I can conclude positively that the adapter plays no role in the performance at least of this system it is however true that the Sony has on average autofocus of 0.25 seconds vs 0.08 of a Nikon D850 so clearly there is a gap there but it is the same on land and in water and adapters do not make this worse
  4. I am abroad for work at present so I had no time to update the post I will do that when I get back You can definitely load the LUT if you have a monitor I do not have one at present however the settings for CineLike D are just Noise Sharpness and Saturation -5 nothing particular and CineLike is REC709 compliant the highlight clip is at 100% not at 75% or 90% like VLOG or HLG so I am not sure there would be any benefit. In terms of contrast cinelike D gamma curve is stretched but it is not a difference between night and day like VLOG. Once you get the LUT on the camera profile this is just a baseline for grading the contrast is not affected so you still need to work it to bring it where you want it to be. I use the Pro Quickies and find the Film settings to work quite well in most cases. Using a filter naturally increase saturation so also on that front I tend to use the automatic setting for color in FCPX pro after the LUT is applied and then finally I look at the LUMA and Saturation curves for clipping. I have to say almost never I clip the highlight as I tend to underexpose -2/3 to -1 as recommended by magic filters however this has to be checked now that the GH5 has a highlight priority mode as this may not be necessary anymore When I have the pictures of the white balance card lanyard I will update this post to let you know
  5. I use the canon on my micro four thirds A guy I met on a boat had a Nauticam set up you need an N100 to N120 adapters then you get a 30 mm extension ring and a fisheye dome His images were great and he did not have focus issues Sent from my iPhone using Tapatalk
  6. Ah. The 10-18 mm is constant aperture? How big is your dome? Sent from my iPhone using Tapatalk
  7. I would keep the 16-50 if you have a dome well designed and placed you can shoot even wider Obviously that may not be the case but I can go all the way down to f/2.8 in a 180mm dome with a MFT so f/4 would be a possibility for sure I have been looking at malapascua for the last 10 years and so far i have not taken the plunge It is fairly blue so maybe a good one for black and white Sent from my iPhone using Tapatalk
  8. If you have a wet wide angle lens set the focus at beginning with your on something at 1 meter and then switch to manual Also at f/5.6 the scene will be fairly dark this is only a 1” sensor you can let the camera go wider Sent from my iPhone using Tapatalk
  9. Hey trimix Your pictures are pretty good I fully agree that the 16 mpix older sensor is not on par but the EM1 GH5 and EM5 III have a 20 mpix sensor And no am not saying that at the same ISO the EM1 performs like a DX What am saying is that when the Nikon says it is at ISO 1600 it really is 1250 when the Olympus says 3200 it really is 1250 too. DX and the MFT sensor differ more on dynamic range and to some extent colors You then have to consider that you need to close the aperture one stop between DX and MFT so at the end is similar With FX equally there are two stops but you loose them with dome sizes What is true is that a raw file from a sony a7 3 or a nikon d850 will recover much more shadows highlights etc as it is more iso invariant Anyway this is way to technical! Sent from my iPhone using Tapatalk
  10. The low light performance of the OMD EM1 MKII is pretty much identical to a DX camera. However the Olympus ISO is well known to be inaccurate when it says 3200 is around 1300 800 is less than 400 It is a marketing trick that creates issus to many. If you shoot at nominal ISO 3200 is like a nikon at 1600 which is also inflated but only a few hundreds Sent from my iPhone using Tapatalk
  11. I use a clip with a soft edge as otherwise it cuts the card but you are making a good point I will add a picture I just heard Keldan is coming up with a checker card and I will receive it for prototype testing
  12. The way I work is to use filter in the first 12 meters where the color rendering is good. Actually the URPRO can go deeper however you have a great housing with a flip which means you can get rid of the filter and use the lights The ambient filter becomes useful in situations where you are at shallow depth and are in the shadow or you want to have colors in the foreground and background that are homegenous For a close up you are going to use the lights as primary source so take filters off because you can If you keep the filter on at close range on both you need to make sure you white balance for the dominant light not on ambient because the light with the filter will be predominant. For example you are at 10 meters and your ambient filter is 12 if you balance for environment you set for 10 but at close range it will be like 12 meters because of the lights and you end up with cool colors or cast which is what happened to you With a housing like the gates you have the flexibility required use the ambient filter only in mixed light situation and skip otherwise
  13. I have been testing DxO Photolab primarily to deal with rectilinear lenses. At first sight the functionality is similar to lightroom then there are some really technical tools but what makes it interesting is the lens profiles by DxOMark The shots that I am enclosing here are 3 versions of the same RAW files, the first is the file as I processed it in lightroom, the second is the same file where I processed it exporting a DNG and then applying settings in lightroom to my surprise it turned out different, the third is a file where the lens distortion correction has been turned off What I can observe is that lightroom is using the lens parameters embedded in the raw file and there is no way to remove the correction the outcome is the lowest quality output in terms of sharpness with some limited pull in the corners but the image is still ok The second file has been processed by DxOLab using an optimised profile for the Panasonic 8-18mm lens as you can see there is less crop and the image is sharper with less pull in the corners Finally there is the same file where distortion correction has been turned off this results in no pull in corners however in my opinion the quality is less than the Dxo Profile. This image has residual barrel distortion in it which has not been corrected The images are at full resolution it will take time to load Images taken with Panasonic GH5 in Nauticam housing with 7 Acrylic port that is the best performing option on the port chart School vs School by Interceptor121, on Flickr DXO_Corrected by Interceptor121, on Flickr DXO_Uncorrected by Interceptor121, on Flickr which one do you like the most?
  14. What happens if you travel to Baja using an internal and not international flight?
  15. I was referring to the close up shots being cold and actually have a blue cast from the keldan filters Your system with a flip diopter is great you should limit the use of ambient filters only to shallower water to eliminate shadows or when you swim through a cave I would recommend the 6 meters blue green filter that matches better with the urpro filter and definitely remove everything in close up shots to take advantage of the high cri of the lights Sent from my iPhone using Tapatalk
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