Difficulties REC.709 Transform Since Update 8.6 BMPCC6KPro

Dear all,

I have just recently updated my BMPCC 6K Pro to the latest firmware 8.6 beta, and now I am encountering a problem that I haven´t been able to solve, and I was wondering if anyone had some advice.

During my first shoot with the new firmware I noticed some problems monitoring my footage on an Atomos Shinobi 5 display - it´s way too contrasty and also too saturated, but not as much as there were two LUTs applied. But it makes it almost impossible to me to judge lighting and colors. It looks fine on the camera display though, but different (better, as if the dynamic range had been improved somehow) from the previous 8.1 firmware.

At first I thought I had a problem with the Shinobi monitor (or applied LUTs twice), but later I noticed that exactly the same is happening in DaVinci Resolve.

I have set the camera to ProRes or RAW recording, with Film Dynamic Range and the "Gen 5 Film to Extended Video" viewing LUT both for the LCD and the HDMI output. "Record LUT to Clip" is turned off. I haven´t done anything with the Shinobi, since it cannot be setup for Blackmagic log profiles, so it just takes the native "extended video" signal.

In Davince Resolve I am using a color managed workflow, set to Film Gen 5 input and REC.709 output. This has always worked fine as a starting point for grading, but now it looks wrong, maybe even as if there was a wrong gamma curve applied (blacks are crushed, too much contrast, too much color contrast and saturation, bright tones are too bright - just like on the Shinobi).

I went back to 8.1 and it looked okay again - but the image I am getting on the camera LCD with 8.6 is much nicer and I was hoping, that I could find a way to get this throughout.

I haven´t found anything about this so far, so maybe I am just making some mistake. Anyway, it would be great, if someone had any advice.

Thank you,
Wolfgang

Do you have Lut selected in Resolve? Turn it off.

Also the camera's monitor has Gamut compression turn on automatically.

Thanks for your reply.

No, I didn't have any LUTs applied. But I found the mistake - I used Rec.709 Gamma 2.2 in the CST and that messed up the contrast curve; so it happened independently of the firmware update ... I thought that 2.2 is better suited for internet distribution and was not aware that it can make such a big difference.

I could not figure out why the Shinobi display is behaving differently, so I ended up creating a viewing LUT for the Shinobi that brings contrast levels down so that it looks pretty similar to the display on the camera again and does not change exposure. With the LUT I could also get rid of the orange tint of the Shinobi which has always bothered me.

Can you share a problem clip, Wolf?

I haven´t done anything with the Shinobi, since it cannot be setup for Blackmagic log profiles, so it just takes the native "extended video" signal.

Just to clarify: Atomos might not have any built in LUTs made specifically for BMDFilm gamma, but that won't stop you from installing your own. Give it a shot! I would also just double check to confirm that you're 100% sure that your Shinobi isn't applying any adjustments.