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dreifish

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dreifish last won the day on February 24

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About dreifish

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    Manta Ray
  • Birthday 02/10/1983

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    http://www.andreiv.com

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    Finland

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    Canada
  • Camera Model & Brand
    Panasonic GH5
  • Camera Housing
    Nauticam NA-GH5
  • Strobe/Lighting Model & Brand
    Sea&Sea DS-02
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    Fridge Magnet Films

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  1. These lights all use the same COB LEDs (other than the Big Blue, which is not a good option, IMO), so the differences between the quality of the light are minimal. More meaningful differences exist between the beam angle and ergonomics. Note that both the Keldan and the Sola have 120/110 degree beam angles, which is a waste unless you're solely filming video with a fisheye. Unless build quality and ergonomics are much more important to you than price, I'd look into the DivePro G18 Plus lights (the Jaunt G18 in the post above).
  2. F4 on and 1/50 with the WWL-1 will allow you to shoot the same sequence at Iso 400 instead of 3200, which is clean enough. Not that the quality of what you posted is bad by any means. A touch of noise reduction and you'd have clean blacks also. Rather I'd pay a bit more attention to the positioning of the lights and the light intensity so they blend together more seamlessly. From that video, it seems the light on the left is noticeably stronger than the one on the right. And they're turned in too much.
  3. I'm in the market for a new set of wide angle strobes. Any recommendations as between these two? Seems Seacam finally announced their 160D in December, but not sure if anyone has one in their hands. They seem to be quite similar, though Seacam includes high speed sync but only has a Guide number of 15 while ONEUW has a guide number of 20.
  4. I have a 67mm URPRO filter sitting around that I wouldn't mind unloading if you still want to get one.
  5. Interceptor, have you compared the 8-15 + 1x adapter vs the WWL-1 in the overlapping range? How does the barrel distortion and image quality compare?
  6. One comment on the post-processing -- the underwater footage comes across as much too crisp and unrealistic -- I think if you've applied a sharpening filter, it's way overdone in that area. I realize that conditions can be a bit murky in the Banda Sea, but I'm not sure the oversharpening is helping you at all here. I echo Interceptor21's comments re: lens selection. A fisheye lens can be nice for certain shots (and it's great for wide-angle photos), but as your primary lens for underwater video, it's really quite limiting and makes it difficult to put together wide-medium-close sequences. Supplementing with a zoom lens, either a wide-angle zoom like the 7-14 (or more ideally 8-16) or the 14-42 + WWL-1 combo would let you capture a wider variety of shots. None of that to take away from the overall result though, which I think shows a lot of promise
  7. For photo only: Nikon D850 or Sony A7RIV. Probably leaning towards the Nikon for Macro and the Sony otherwise, simply because of past experience with the 90mm macro focusing on the sony A7RII. Unless it's significantly improved as Simon has heard, in which case I don't see much benefit to the D850. But I'd be happy with either if all I was shooting is photos. In terms of lens selection, the Canon 8-15 works great on the A7RIV with adapter, the Sony 16-35F4 worked great for wide angle for me in the past (I prefer it to the Nikon 16-35F4), even with a 180mm dome, and the Sony 90mm macro is a great lens, albeit it slow to focus on the older sony A7RII/A7RIII. For video predominantly: Probably Panasonic S1R today or wait for Canon 1DX Mark III. Stabilization is important, adopted lenses are fine on the S1R. But I tend to agree with Interceptor21 that full frame may not be the best option for video, and there's a lot of interesting m4/3 and s35/aps-c options out there. Also, if you're shooting predominantly video, I think an argument should be made to go for a purely video camera rather than a hybrid. I'd take a hard look at the BMPCC 4K and 6k and the ZCAM E2 (along with the GH5, which I own). The Canon C500 Mark II looks very tempting if you've got that sort of budget. If shooting 50/50 Photo/Video: ???? I don't think currently a great full frame option exists. The Panasonic S1R arguably, though I'd prefer to have higher resolution for the photo side. Sony white balance isn't great, and none of their offerings even shoot 4k60, which I've come to love on the GH5, so I wouldn't 'upgrade' to any camera for video that didn't at least have 4k60, stabilization, and prefereably a raw codec. For photos, I'd like to have >= 36mpix. I guess the Panasonic S1R technically meets those specifications, if shooting video in the 4k mode, but no higher bit rate options at 4k60 and no raw. One can hope that the Sony A7SIII when it finally comes around gives us a 36mpix sensor, sensor stabilizaton, 8k30/4k120 (or at least 60) and some form of raw recording. Now that would be perfect. But so long as it doesn't have raw and the sony white balance remains as it is today, I won't be buying it either. What's conspicuously missing from all the above categories IMO is anything from Nikon & Sony's new mirrorless range. Lens selection for these cameras may be fine, but there's nothing particularly compelling about the Z6, Z7 or EOS R for either underwater photos, videos or in a hybrid role.
  8. The 140mm dome works perfectly with the 8-15 on the a7rii, Simon. I used that combo for a couple of years. Downside is splits are difficult, but for travel and currents, it's a big asset to have the smaller port. The 170mm dome is made for rectilinear lenses, just like the Nauticam 180mm. It's not the ideal option for a fisheye. I'd go with the 140mm + a seperate dome port dedicated for splits. The nauticam 8.5" acrylic dome works fine for that purpose and it's 1/4 the price of the 230mm glass dome
  9. I haven't shot with a rectilinear lens like the 8-18 or 7-14 on the GH5, but my experiences with the 7-14 on the GH4 amounted to the pespcetive distortion being too great at the 7mm end. On the other hand, now that I think back, I shot video with the 16-35mm on A7RII for a while with Nauticam 180mm dome and was overall fairly happy. Never experienced the severe pincushion perspective distortion you see with a 7 (14mm FF equivalent) lens. Now, if I read you article correctly Massimo, the horizontal angle of view of a 16mm (full frame) is more or less the same as the horizontal field of view of the WWL1 at the widest end, right? Maybe that suggests that this is the widest angle of view you can deploy for video before perspective distortion becomes too distracting. I should play a bit more with my 9-18mm olympus lens with GH5 and 180mm dome. If the horizontal AoV is really quite close to the WWL-1 and the rectilinear percepective distortion is under control at 9mm, it does give some advantages over the WWL like being usable for split shots and better reach and IQ at the long end.
  10. Hmm.. interesting observation Massimo. It hadn't occured to me that the fisheye distortion accentuates the WWL-1 diagonal FOV, but I see your point. Still, even if the horizontal field of view of the WWL-1 and 7-14 are roughly equivalent, the WWL-1 for sure produces much more usable results. The perspective distortion with a rectilinear lens at 7-8 MM is very off-putting.
  11. This doesn't accord with Nauticam's claims that the WWL-1 produces a 130 degree diagonal field of view with a 28mm equivalent lens. 28mm = 14mm in m4/3 terms. On m4/3, 130degree degree diagonal field of view with equates to a 5mm rectilinear lens (14*.36 = -surprise-surprise- 5.05). The 7mm end of the 7-14 only has a 114 degree diagonal field of view.
  12. As I explain above, the lack of a native fisheye is entirely negated by the fact that the adapted Canon 8-15 works flawlessly. By pretty much every other manufacturer, you mean whom? Canon and Nikon? Neither of them has such a 'native' fisheye if you look at their mirrorless offerings. Neither does Panasonic for full frame. Maybe a native Sony fisheye would have even faster autofocus, but it's completely irrelevant. I struggle to imagine any scenario where the adapted solution wouldn't be fast and accurate enough. In fact, I'd be willing to bet that if you paired up the Sony A9II with an 8-15 shooting at 20fps, you'd get more in-focus shots in the most demanding action scenario you can envision than pairing the native 8-15 with the Canon 1DXII or the Nikon D5. With all due respect, Adam, this is purely FUD (fear, uncertainty and doubt). Nikon and Canon rely on off-sensor PDAF which is inherently less accurate than on-sensor PDAF or contrast-detect autofocus. Maybe the autofocus was slower on first (and to some extent) second generation Sony A7s, but it has never been /less accurate/ and today there are plenty of tests online demonstrating the A7III, A7RIII, A7RIV and especially A9/A9II get you more in-focus images in action scenarios such as sports than their Canon and Nikon DSLR equivalents. If you still think DSRL autofocus has any advantages over Sony's mirrorless line, your opinion is several years out of date. This is purely speculation that sounds reasonable at a quick read, but is both technically inaccurate and not borne out by real world experience. From a technical standpoint, the simple electronic translation from the Sony control protocol to the Canon control protocol happens in fractions of a millisecond, so while there is objectively a delay introduced, it's completely irrelevant to the total time it takes to focus since actually moving the physical focus elements takes orders of magnitude longer. As for accuracy -- we're talking a completely digital transmission chain. How could the adapter possibly impact the accuracy of the autofocus? To answer your turned-around question, if I was buying an underwater system today purely for photos, I'd probably struggle to choose between the D850 and the A7RIV. I think I'd lean towards the D850 for macro, but the IQ from the A7RIV is superior in my view (more resolution) and for wide angle, the 100% autofocus coverage is better than what the D850 can offer. Not to mention that on-sensor PDAF is more accurate than off-sensor PDAF. If Sony's animal eye-detect ever expands to include fish, it'd be a no-brainer in favor of the Sony for both wide angle and macro scenarios. Right now, only three things weigh in in the D850's favor -- (a) better subject tracking with 3D tracking (this might no longer be true with the latest generation of Sonys, but I haven't tested it), (b) an optical viewfinder, which I prefer for underwater mixed light wide angle photography, (c) base ISO 64 and slightly faster 1/320 flash sync speed for slightly more ability to control the ambient light. Conversly, the Sonys offer (a) more accurate autofocus (no need for autofocus adjustments to lenses), (b) faster frame rates for action, (c) wider autofocus point coverage, (d) higher resolution, and (e) sensor stabilization. But hey.. don't just take my word for it. Backscatter has done an extensive comparison between the D850 and the A7RIII underwater. I think it's safe to say that the A7RIV would have performed even better in things like autofocus. If you bring video into the equation, it complicates things. Then I'd lean towards the Panasonic S1H or the newly announced 1DXIII.
  13. I've used the Sony A7RII (a 2 generation-old Sony) + metabones adapter + Canon 8-15mm for several hundred dives and never had a single thing to complain about when it came to wide angle photos. It had perfectly good autofocus (both fast and accurate) for wide angle and excellent image quality. I'm sure the A7R3 and A7R4 are even better. Prior to that, I used the D800 + Sigma 15mm fisheye for 100-200 dives, and the A7RII + Canon 8-15 was every bit as good or better in terms of both image quality and focusing for wide angle purposes. Not as good for macro focus and focus tracking for macro, but that's a different story. And yes, for wide angle mixed light shots, I do think an optical viewfinder is better than the current generation of EVFs because of the dynamic range it can display. If I was to buy today, I would without hesitation pick the A7R4 over any of the Nikon Z cameras or Canon mirrorless. Lack of a native fisheye option is irrelevant -- the adapted canon 8-15 works so well that it's very hard to imagine how it could be improved upon. The only full-frame camera I would rate as a better purchase for underwater (if only taking photos) would be the Nikon D850. For the record, I have no real skin in this game, as the only underwater setup I currently own is a Panasonic GH5
  14. 1. The color chart isn't necessary. It's there to confirm the accuracy of the technique. 2. The technique as I understand it requires multiple pictures of the same object from different distances in order to reverse-engineer the water filtration factor by comparing the colors of that object (or pixel) from different distances. 3. The advantage over a simple white balance as far as I understand is that it depth-maps all the elements in the picture in 3d space and appropriately color-corrects for all of them depending on the amount of water between that object and the camera. So you'd see warm colors extending far into the background, not just for the foreground subject as you would get with a normal white balance off a grey card at foreground distance. 4. For photos this process is rather cumbersome as it forces you to take multiple pictures of the same subject from different distances. So it will not provide a 1-click adjustment for photos in its current form. 5. For video however, this could be brilliant if your video clip involves movement anyway, as you can get a lot of distance information from subsequent frames of the video (the same way you can get 3d mapping from a moving video clip when doing photogametry). So potentially this could be implemented as a 1-click solution for a video file. Though it would obviously work better raw video.
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