John Brawley wrote:At the moment the zebra only goes down to 75%. The other thing to note is that it works of the sensor's LINEAR data. No gamma is applied to the zebra setting. That means when you set it to clipping, at 100%, it's basically showing you sensor clip IRRESPECTIVE of the ISO you might have set. This has more ramifications when shooting ProRes and DNx.
I know there are other exposure tools being looked at for down the road. For the moment Zebra works very well for me. There's so much DR that as long as I know what's clipping or near clipping, I know everything else is being captured. jb
You might not be able to answer these questions because of your NDA, or because the current firmware -- or, possibly, "certifications" -- simply don't allow it, but here goes:
(And my questions may not make sense since I'm still attempting to figure out how I might use the BMCC's zebra feature, at least at first.)
When shooting BMCC ProRes or DNxHD, given that the zebras are reporting sensor clipping, might it be possible for a user to determine a zebra value (say "75" or whatever) which consistently reports a fairly accurate
relative "normal" exposure point for skin?
So, for example, through testing I may find that BMCC zebras at 75 on skin means the skin is 2 stops over (or whatever), so I know I have to adjust exposure settings accordingly?
If I remember correctly you've reported that when shooting RAW you set zebras at 100 and, given the BMCC's 13-stop latitude, "everything" falls into place exposure-wise other than very bright areas you've decided are OK to clip.
But when shooting ProRes/DNxHD, how might a DP use the BMCC's zebras to gauge typical exposure settings for skin? Or, is the DR/latitude in ProRes/DNxHD close enough to RAW that one sets exposure more or less the same way?
BTW, I've never used a light meter for shooting video and I'm not about to start. I have, however, used zebras in video cameras for decades.
Again, my questions might not make any sense, or can't be answered today. Either way, cheers!