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joncroweucl

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joncroweucl last won the day on September 18

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About joncroweucl

  • Rank
    Clownfish
  • Birthday 05/10/1987

Profile Information

  • Gender
    Male
  • Location
    Cambridge

Additional Info

  • Show Country Flag:
    United Kingdom
  • Camera Model & Brand
    Panasonic GH5
  • Camera Housing
    Nauticam NA-GH5
  • Strobe/Lighting Model & Brand
    Retra Prime Pro

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  1. Already have 1 Retra Flash Pro (non-x) and am looking for another unit for a matching pair. Based in the UK so would prefer to purchase from British seller. Also interested in white and wide angle diffusers and reduction rings if seller is interested in parting with these also. Seller offers welcome.
  2. I am absolutely astonished that the toothpaste and microfibre cloth technique worked. Both the manufacturer and a local servicing company recommended dome replacement at high cost. After 20-30 mins the scratch was completely removed with no trace left. Tested it in the bathtub and no optical issues or ghosting where the scratch was impacting images prior to the fix. Thanks @Gudge for the advice!
  3. I can see there has not been much discussion on this topic, at least on this thread, for over a decade. Hopefully people have been having success! I have unfortunately suffered an abrasive scratch to the glass dome of my Zen DP-100 thanks to an accident on a boat. See picture attached. The result is a dark spot in pictures where light is blocked by the scratch. The scratch is barely perceptible by running a finger nail across the surface of the dome. It is approximately 5 mm x 1 mm. Has anyone had success with DIY glass dome polishing and repair?
  4. LX10 does not play nice with wide angle wet lenses. The port is too long. If you're set on the LX10, Issota sell a housing where you can swap in a shorter port.
  5. I used my dive skin glove as a template to cut out a section of a 18% grey microfibre cloth and sewed it to the palm: The palm of my hand is plenty big enough for the white balance function on my GH5. Please note I have not used this on a dive yet. I'll get the chance to use it in Sept 2021.
  6. Does using a colour checker only allow you to balance the colours for subjects at the arbitrary distance the chart is held at from the lens? Would it not be simpler and more economical, when using ambient light, to use red filters and white balance off of a white or grey card before hitting record? I'm planning to sew a section of my 18% grey microfiber cleaning cloth onto the back of my HECS dive skin glove to use a a white balance reference when shooting ambient light video. The back of my hand is slightly bigger than the manual white balance set box on my Panasonic GH5 with a 14-42ii behind a WWL-1.
  7. As Alex states in the video, I am concerned that one day I may lose or break my focus light ACDC battery charger and be left with a paperweight. My focus light has a proprietary LI-ION battery pack (14.8V 3400mAh 50.32 Wh) charged with a DC pin from a proprietary ACDC adapter (Out 16.8V 2.8A). I'm making the assumption there a 4 Li-ION cells in the battery pack rated to be charged at 4.20V/cell. Said charger is big and heavy and requires a free wall plug. The battery pack says 'Do Not Charge It Other Than With Exclusive Battery Charger'. I'm interested in the potential of charging this battery pack over USB power delivery. I have a 65W PD USB charger and am interesting in running USB-C to a type-c female to DC jack adapter. These come in all sorts of sizes and voltage classes. For example: https://www.ebay.co.uk/itm/233853237121?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3D8578709eb63e43e1bc14b5c08840fc06%26pid%3D100675%26rk%3D1%26rkt%3D15%26sd%3D233853237121%26itm%3D233853237121%26pmt%3D1%26noa%3D1%26pg%3D2380057&_trksid=p2380057.c100675.m4236&_trkparms=pageci%3A5eaf3b50-db54-11eb-831c-0621da914732|parentrq%3A6818dc9517a0acf3822d1081ffe59aba|iid%3A1 Would it be safe to use a USB PD - 15V DC adaptor for this battery pack? Does using less than specified voltage do any harm to the battery other than charging it at slower rate? Could this in fact be advantageous? I expect if I were to use a 18V or 20V USB PD - DC adaptor, this will likely exceed the 4.20V/cell and cause damage to the battery pack and cause a hazard. I do not know the extent of overcharge protection on the battery pack and therefore the acceptable risk is zero. Any expansion or clarity on this solution highlighted at the beginning of the video would be greatly appreciated.
  8. Thanks for the insights, @Interceptor121 I had the Panasonic Image App running and watched through my phone as I filled the sink to see if I could notice the FOV narrowing. I was so pleased to see that there was no noticeable difference that it didn't occur to me to take a before and after shot. I'll do it next time. After some investigation I've determined that the interior ring of the dome port is just making contact with the face of the zoom gear extension ring. This is causing increased resistance when turning the knob on the port adapter and making changing the focal length difficult. I'm also concerned that persisting and accepting this situation will eventually lead to stripping the teeth from the port adapter knob gear. I plan to file away the exposed face of the zoom gear extension, or ask my maker friend if he can amend the design of the extension for my port. I'll post an update once I've made progress.
  9. See below a limited summary of the equipment setup and and test results. This summary is not designed to be a comparison to other setups for the Canon 8-15 on m43, simply an investigation into the feasibility of this specific equipment setup. https://www.flickr.com/photos/193329934@N02/albums/72157719526251695/with/51278536908/ The equipment fits comfortably. The extension built into the Zen DP-100-N120CR minidome removes the requirement to use a N120 extension ring. IMG_20210627_102210 by Jonathan Crowe, on Flickr My experience is that the operation of using the knob on the port adaptor to adjust the zoom on the 8-15 was a bit stiff and clunky. @Interceptor121 and @Architeuthis, did you experience the same? I'm wondering if the dimensions of the zoom ring adaptor I had printed are a bit off and I'm experience sub-optimal performance. With no extension ring, the positioning of the lens front element is 5mm closer to the glass dome that is determined to be optimal by Zen and Nauticam. This is because the 1x adaptor is 5mm deeper than the Metabones Speed Booster Ultra 0.71x Lens Adaptor that the Nauticam N85-N120 34.7mm Port Adaptor is designed for. IMG_20210627_101826 by Jonathan Crowe, on Flickr It is difficult to determine the impact on image quality and field of view, with this deviation from optimal entry pupil positioning, in the absence of comparison images captured using the 30mm N120 extension ring and N120 140mm dome. With a recent opportunity to dive on the North Norfolk cost eliminated by poor weather and diving conditions, I resorted to the controlled photography environment of my kitchen sink. IMG_20210627_163003 by Jonathan Crowe, on Flickr The subject was a small spool with line positioned on a small ceramic bowl. The base of bowl was touching the dome shade. This was to simulate golf ball sized subject with interesting skin texture and facial features on a rocky outcrop. The bath mat has a very subtle rough texture and was positioned so the printed images were close to the corners of the frame. I think the image quality is excellent. The depth of field necessary to resolve the texture on the bath mat is achieved at f8 and corner sharpness is not improved by stopping down any further than f11. P1111054 by Jonathan Crowe, on Flickr More images at different apertures are available at the Flickr link at the top of this post. I saw no point in testing the lens at 15mm in the sink as I could not position any suitably sized subjects and a reasonable distance from the port. I'm happy with this setup as it delivers very good image quality and accomplishes my goal of fitting all my equipment in a IATA compliant carry on rucksack. This would have been very difficult/impossible if an extension ring and 140mm dome were substituted. If I ever get a free house in the future I plan on testing the zoom range and IQ of the Canon 8-15 FE and the Panasonic 14-42ii behind the AOI-UWL-09 wet lens in the bathtub with subjects at different distances. There is very little analysis of the AOI wide wet lens on WetPixel, so I plan to make a contribution. I'll be diving off of the Farne islands in September 2021 so my objective is to have a better understanding of the capabilities and limitations of both lens setups before I go and deploy them in the real world! I'm happy to receive any thoughts, feedback or suggestions for further testing.
  10. I would advise against the Nauticam LX10. The port is too long and does not accommodate any of wet wide angle lenses without significant vignetting and extreme soft corners. You need to zoom to ~36mm and close the aperture all the way down, which really is really restrictive and a major issue for shooting stills. I'm unfortunately speaking from experience. This is far less of an issue if you are planning 4k video as it this applies a significant crop and 16:9 aspect ratio also crops out the most offensive soft corners. The Isotta LX10 housing has an optional short port that remedies the issues with wet wide lenses at the expense of reduced zoom-through range. This also limits the utility of swapping to a wet macro lens, if desired. For not much more you could upgrade to an Olympus PEN, EM range or Panasonic GX80, or stretch to a used GH5. I'm currently using the latter and I expect it will keep me happy for years before my abilities begin to outgrow the capacity of the camera or m43 format. I can also fit all my kit into a IATA carry-on rucksack. I love it and heartily recommend it. Happy to discuss more of you want additional info.
  11. So there were no Nauticam dealers in my local region that stocked the 41.5mm port adaptor. I've gone ahead and ordered the 34.7mm adaptor and have managed to obtain the 3d printed extension for the zoom ring. Thanks for the design, Wolfgang. To summarise; I'll be testing the Canon 8-15 FE with Viltrox EF-M1 Smart Adaptor on Panasonic GH5 in NA-GHV housing, 34.7mm N85-N120 port adaptor and Zen DP-100-N120CR minidome. If all the kit fits my initial tests will be limited to my bathtub. I've not done and lens-dome testing before; I plan on making CFWA test shots with small SCUBA kit (15m reel, torch, boltsnaps etc.) with vivarium foliage stock to the walls of the tub to assess DOF and corner sharpness at different apertures. Community; are there any specific assessments you'd be interested in seeing?
  12. Good point, Chris. I'll be sure to ask Nauticam the same question re: positioning of the adjustment knob and gear meshing relative to each adaptor. My concern with using the 34.7mm N85-N120 adapter with the Zen DP-100-N120CR minidome is that the front of the lens will sit ~5.6mm closer to the port than is optimal. Maybe this is an irrelevance or indeed preferable to being 1-2mm further away? Maybe all this fuss over a few mm amounts to imperceptible differences in the real world the feedback from Zen gave me that undesirable sinking feeling, but then again they stated repeatedly they hadn't tested my specific combination, so were right not to make a specific recommendation.
  13. Interesting to hear about custom extensions.... I'll get in touch with Nauticam to confirm if the Viltrox and Metabones smart adaptors can fit in the 41.5mm port adaptor. I expect this will be no issue personally, as I can remove the tripod mounting foot on the Viltrox. As you said, best to check! Assuming positive feedback from Nauticam, I'm going to pull the trigger for the 41.5mm port adaptor with the DP-100-N120CR. At least that will get the system in the water for some testing. I'll be doing some shore diving in August and seal diving in the Farne islands in September, so it'll get a real-world test then. If all works I'll be delighted to be able to take the 8-15 underwater with just the adaptor and minidome. Very travel and "relatively" budget friendly kit
  14. Apologies @Architeuthis for inducing a bout of GAS! The reason I brought up the question re: minidomes is I managed to pick up a second-hand as-new Zen DP-100-N120CR for less than half-price new; I just couldn't resist. I reached out to Zen re: DP-100-N120CR compatibility with smart adaptors and this is their feedback: "We have never tested the Viltrox EF-M1 adaptor so unfortunately we cannot make a recommendation when using the Zen DP-100-N120CR. We have only tested this combination when using the Metabones Speed Booster Ultra 0.71x Adaptor. With the speed booster, you would only need the 36064 N85 to N120 adaptor plus the DP-100-N120CR as the extension is already build into the DP-100-N120CR. An extra 5mm of extension is the recommended solution for the smart adpator. The smallest extension ring Nauticam makes is 10mm so I am afraid that would push the dome too far forward and cause vignetting. Again, we have never officially tested this so you are welcome to try, but I do believe you will see vignetting if you were to add 10mm of extension." Question for the community: using a EF-M43 smart adaptor and 8-15: If you were to go with the 36184 - 41.5mm n85 - n120 adaptor and Zen DP-100-N120CR the lens would be 1.175mm further from the dome than optimal. Similarly, if you paired this 41.5mm adaptor with a 30mm N120 extension and Nauticam 140mm Dome, the lens would be 1.8mm further from the dome than optimal. Do my calculations add up correctly? Would this variation from optimal positioning be expected to result in noticeable degradation to image quality/vignetting? I think you can see where I'm going here. If I can find one port adaptor and one extension that supports both of these domes for the 8-15 adapted to MFT, I'd be very happy.
  15. @Architeuthis and @Interceptor121: To follow up on the adapted Canon 8-15 FE on MFT: If one were to go for a lighter setup, would the Zen DP-100 Fisheye Dome Port be a viable alternative to the Nauticam 140mm dome? What is interesting from the Zen N120 port chart is that the DP-100-N120CR does not have a specified extension ring: https://www.portchart.net/zen-only/by-combination-group/nauticam-n120/ I'm not sure how this can be feasible; I've reached out to Zen customer support for clarification. Have either of you considered the 100mm dome for 8-15FE on GH5?
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