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A.Y.

Member Since 04 Jul 2009
Offline Last Active Aug 22 2015 05:13 PM
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Posts I've Made

In Topic: Annoying Final Cut Pro Stutter

22 August 2015 - 05:13 PM

Try adding a short transition between clips to see at which duration the problem goes away. (or not)


In Topic: Sony a7s and MWB

22 August 2015 - 04:30 PM

White-balance RAW tests I did show a red filter is needed to get accurate MWB for both Sony 5R and 5N under more than 9m/30ft of water. This may be true for A7S also.

Manual WB without filter:
@ 12m/40ft requires 12000K and +150 Magenta
12000K is outside 5R/5N's 9900K maximum color-temperature range which produces an error message. I think +150 Magenta is also outside the camera hue range.

MWB with an Equinox red filter:
@ 12m/40ft requires 6400K and +150 Magenta
Even though 6400K is inside 5R/5N's color-temperature range, I think +150 Magenta is just outside the hue range, resulting in an error message. However, MWB produces very good colors.

MWB with an Equinox red filter:
@ 9m/30ft requires 4600K and +75 Magenta
Both color temperature and hue are within the camera MWB range so no error message.

BTW, shooting AWB with a red filter, NEX-5R and 5N produce strong green cast in backlit situations. Shooting MWB definitely prevents the drastic color shift, which = less headache in post.


In Topic: 4K: Current Pro- and Semi-Pro Underwater Filming Options

22 August 2015 - 03:53 PM

Nauticam NA-A7II Underwater Housing for Sony A7RII.


In Topic: What camera for video?

12 June 2015 - 01:45 AM

What's special about the GoPro 4 Black is that it features 2.7K (2704x1520) 60p, 50p, and 48p video which appear noticeably sharper than 1080p video on 27-inch desktop and 15-inch laptop monitors with 2560x1440 and higher resolution. Of course 60p, 50p, and 48p videos are lifelike smooth when playing back at the the native frame rates and slow motion. A computer that can play 4K 30p smoothly should have no problem with 2.7K 60p.

The slowest shutter speeds for GoPro are 1/fps - 1/60sec 60p, 1/50sec 50p, and 1/48sec 48p.

The camera ISO can be limited to 400, and 1600.

The White Balance can be set to 3000K, 5500K, and 6500K. For underwater, 6500K with a dive filter rated 6-15 meters (20-50 feet) produce good results under ambience light that can be corrected quite easily with NLE.

I'm happy with the Flip Filter System since switching filters and getting rid of the bubbles on the lens are so easy, although I have not tried the Macromate macro solution yet.

In Topic: Nauticam Shogun Housing is here

22 May 2015 - 02:58 PM

fcpx-a7s.jpg

 

Thank you Eric Cheng for making the ProRes 422 700Mbps clip available for us to examine. The white balance of the original footage is excellent. Is it right out of the camera? The details and dynamic range this system captures are amazing.

 

Since I dive the California kelp forests often, this is my suggestion on grading to restore some of the kelp colors. It's just a quick adjustment, masks should be used to add more contrast in the mid-tone areas.

 

I'll remove this image in case it violates Wetpixel copyright policy.