Hello all, long time reader / lurker and recent Sigma fp buyer here.
I wanted to join into the fp conversation and ask if anyone else is experiencing black level flickering with firmware 1.01 with 12bit 4K capture?
There are a handful of quick technical tests I've done to figure out the flickering behavior, and this is the most comprehensive:
It doesn't show in the above video, but ISO 400 actually still flickers. With my own camera, 320 is the highest I can go on the low end, and the next one up without flickering is 2500.
On the other hand, it doesn't seem to be a massive loss right now since 320 + F1.4 seems to be enough to capture a dark city road close to how it appears in person, as you can see with this clip:
Would anyone be willing to do a quick ISO test of their own camera to see if you have any flickering blacks at each ISO level? It shows up quickly, so each ISO wouldn't need more than 5 seconds of capture time to see it. It doesn't seem to matter what the light source is, either, as it happens in sunlight as well as with LED lighting.
It may be subtle in the image if it happens, but you'll definitely see it happen in the bottom of the waveform on playback in your post software of choice. Oddly, it seems to mostly affect the red and blue channels.
I've tried resetting the camera and re-installing the firmware to no avail.