rick.lang wrote:Mark, if I set Clean Feed Off for the BMPCC4K camera and have the HDMI Zebras set to 100% and have the BMVA12G7 Zebras On at 100%, I see the identical amount of Zebras. If I turn Clean Feed On for the BMPCC4K, I only see the same Zebras when I set BMVA12G7 Zebras at 85%.
Not sure why, but the moral of the story appears to be keep Clean Feed Off on the camera while judging exposure.
I also took a look at False Colour and with a camera Clean Feed On, you don’t see False Colour on the BMVA12G7. With camera Clean Feed Off, you see the False Colour but it’s not a perfect Colour match. For example when the BMPCC4K shows a lot of pink with some red and yellow, the BMVA12G7 shows a lot of light grey with my lens at T2.1. With the lens at T4, both screens look quite close with lots of green and pink on them.
Then I thought about my codecs. I had BRAW in the BMPCC4K and of course ProRes on the BMVA12G7. When I switched the camera to ProRes, now the False Colour looks identical at T2.1 and neither has red. And when I go back to the Zebras, both BMPCC4K and BMVA12G7 have identical Zebras! No more problem.
So the Zebras and False Colour do not behave identically if the choice is a BRAW codec on the camera. This makes sense given the inherent differences between those codecs.
Thanks Rick for checking this. It seems the G2 and 12k in combination with the OG VA 5" and new VA 5" do not behave this way. It seems no matter what I choose, it is still clamping (I believe is the correct term) the scopes and zebra. The image, though, does look the same (I think).
Jamie LeJeune wrote:I'm not seeing anything necessarily unexpected from the Video Assist, but the zebras do work differently than the BMD EVF when connected to the Ursa Mini Pro.
With the Ursa Mini set to record BMD film and a clean feed with the 3D LUT off out of the front SDI, the Ursa EVF zebras will match the zebras on the camera LCD.
On the Video Assist, its video scopes and the zebras only report exactly the signal fed in. With the camera set to record BMD film and a clean feed with the 3D LUT off out of the main SDI, the values of the log signal are what the internal zebras and scopes on the Video Assist will read.
This difference makes sense as the Video Assist is designed for all sorts of cameras as opposed to the purpose built Ursa EVF. The Video Assist scopes and zebras respond the same as any external display would.
A work around if you want to record in BMD Film and have the zebras match on the Video Assist is to turn on the zebras from the camera out the Main SDI and turn off the zebras in the Video Assist.
EDIT - And I should add that this method for matching the zebras between the camera and the Video Assist works regardless of any LUTs on either the camera feed or in the Video Assist itself.
Thanks, Jamie for the info. Much appreciated.
"On the Video Assist, its video scopes and the zebras only report exactly the signal fed in. With the camera set to record BMD film and a clean feed with the 3D LUT off out of the main SDI, the values of the log signal are what the internal zebras and scopes on the Video Assist will read."
- My setup, unfortunately, is not behaving this way. When I have it set up to reflect what you just described the zebras on the VA are still not displaying correctly (the only kick in at 60% and the scopes are clamped).
- Yes, your workaround does work. But, one of the biggest reasons to use the VA (for myself anyways) is the dual record function, and the zebras would ruin the image.