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dreifish

Member Since 25 Oct 2013
Offline Last Active Dec 04 2016 11:44 PM
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Topics I've Started

FS: 2x 5200 lumen Archon w42vr Video Lights - $450 each

09 November 2016 - 03:56 PM

Excellent lights -- come with both white, red, blue and UV modes. I've used them on about 50 dives. Selling because I've since upgraded to a set of Gates GT14s.

 

USD $450 each + shipping or best offer.

 

Attached File  175.pic.jpg   24.88KB   21 downloads

 

http://www.archonlig...ight-w42vr.html


Looking for GH4 10-bit footage

24 October 2016 - 05:46 PM

Does anyone have some sample 4k 10-bit 4:2:2 footage shot with a GH4 + external recorder in Prores that they'd be kind enough to share?

 

I'm curious how much the 10-bit files can be pushed in post-processing. With the GH5 coming out with 4k60p and 4k30p in 10bit internally, it seems like it might be a good option at a middling price point (though, a housed Shogun is still going to cost $5000, ugh).I'd really like to see how malleable the files are first though.


Color Correcting Purple Water

20 October 2016 - 08:31 AM

I've noticed that a number of cameras, including my current Sony A7RII and former GH4 tend to turn water an ugly purple color when custom white balancing at depth, with or without filters for assistance.

 

As best as I understand it, this is because they push the red channel a bit too much in order to give a pleasing appearance to the foreground objects and make the white balance slate actually white.

 

One approach to combat this might be to introduce some red/magenta into the white balance slate itself.

 

But it seems it's possible to adjust the magenta in post as well. Here's the results of my initial test using ColorFinalePro in FCPX and playing around with the blue slider is the 6 vectors. The footage comes from Backscatter's review of the Sony A7RII and was initially exposed using a orange filter and custom white balance, I believe. 

 

https://youtu.be/6_YnpLnnT1M

 

If anyone else has insight on how to improve on this, please share!


Tokina 12-28mm f/4.0 AT-X Pro DX Lens

07 September 2016 - 10:52 PM

Has anyone used this underwater? What are it's characteristics behind a 170mm, 200mm or 230mm dome?

 

On paper, the range seems perfect for 4k video on the Canon 1dx II, which has a roughly 1.3x crop -- effectively making this a 15.6mm-35.6mm equivalent lens.

 

Canon's own EF-S lenses can't be mounted on the full frame bodies, and the full frame wide angle lenses are too narrow (other than the 11-24mm, I suppose, but that's a beast!


Nauticam 180mm/Zen 170mm domes with fisheye lenses

03 June 2016 - 09:06 PM

Has anyone used either of these two domes with fisheye lenses on a full frame or APS-C camera? How was the performance and image quality if so?

 

 

My understanding is that both these domes are designed for wide angle lenses rather than fisheyes, so the angle of curvature is different -- they're slices from much wider diameter domes. How would this impact their use with fisheye lenses? Am I going to get better image quality with a smaller fully-circular dome like the Nauticam 140mm dome or the Zen 100mm dome?

 

Use case -- Canon 8-15mm lens w/ or w/o 1.4x teleconverter an a Sony A7RII camera. Potentially the Tokina 10-17 with a Nikon D500 in the future. I'm trying to find a dome that's a good balance in terms of image quality, price and size for travel.

 

I'm currently using the Nauticam 8.5" dome and I'm happy with the image quality at F8 or narrower (usually shoot around F11). But the size of the dome is a little inconvenient for travel, not to mention that it makes the camera a little too positive at the front (have to counteract by strapping a 1kg weight on a weight belt around the dome port extension). One further advantage I see to the 170mm/180mm domes vs a 140mm or 100mm dome is that they would make shooting over-unders a bit easier.