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A.Y.

Member Since 04 Jul 2009
Offline Last Active Jun 27 2015 06:50 PM
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Posts I've Made

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.


In Topic: Nauticam Shogun Housing is here

20 May 2015 - 07:40 PM

Found the original, thanks!


In Topic: Nauticam Shogun Housing is here

20 May 2015 - 04:06 PM

 

Since this Shogun Showreel contains footage from Eric Cheng, most people on Wetpixel must have seen it already.

 

1:02 into the video - such impressive dynamic range.

 

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CORRECTION: The GH4 and A7s were mentioned on the page, but I just realized only A7s ProRes 8bit 422 footage appeared in the video credit, not the GH4 10bit 422.


In Topic: Nauticam Shogun Housing is here

16 May 2015 - 02:13 PM

Prores supports any resolution but was designed for 1080p it's an inefficient codec without temporal compression that came up when the best you could do was avchd 24 Mbps.

For what concerns the shogun it's an interesting tool but 220 Mbps seems a bit too low for extensive grading in 4K. At 1080p instead is plentiful

The shogun will produce fine results the amount of color correction you will be able to do with 220 Mbps at 4K is not a lot as every frame is pretty small in size.
Take an 8 megapixel image in raw squeeze it in a 1.14 MB JPEG now try to do some color correction you will see you can't do a lot.

 

To the moderators:

 

Amazing! This person keeps repeating these false claims as absolute fact! The truth is 220 Mbps is ProRes HQ 422 target data rate for 1080p30 only, its maximum data rate is 880Mbps or 110MB/s so each 4k frame size will be 1.8MB for 60p, 3.6MB for 30p, and 4.6MB for 24p. Atomos Shogun document shows it can record at 880Mbps or 110MB/s.