GH13 HORRIFYING artifacts.

D

dumile

Member
But this was my first night shooting with this camera, so I'm not surprised.



Rolling shutter I assume. But what classification of artifact would this fall under? And, can it be fixed in post? Will Cineform or 5DtoRGB help?


Info:

GH17
20mm 1.7
Hand Held (pistol grip)
Aperture - 1.7
Shutter speed - 30
ISO - If I had to guess, 250
Blackout Powell 24p Patch
28.0 MBPS (low, no?)
Maximum bitrate - 54.0 MBPS
 
Rolling shutter doesn't appear in static shots, you'd need to pan or shoot a moving object to see it. I didn't see anything unusual in the clip, other than it being rather soft. I'd suggest raising your shutter speed to 1/60 and ISO as high as 400 with indoor lighting. Average bitrates in low light will range around 20-35Mbps, with a 55Mbps peak. You'd need to shoot something highly detailed and brightly lit to get average bitrates over 40Mbps.
 
I'm not seeing any artifacts or rolling shutter either. If you're referring to the flickering blue at the top, it's light from that television in the background.
 
He's probably referring to the light flicker

Basically there is an mismatch in frequency between the light Hz and your camera shutter

Search for "flicker" or "LED flicker" or "fluro flicker", terms like that, it's discussed quite frequently
 
PDR said:
Basically there is an mismatch in frequency between the light Hz and your camera shutter
Click to expand...

Most probably.
It depends on where have you been (USA/EUROPE/... I mean local AC frequency), camera's frames per second (24/25) and shutter speed. If local frequency is 60Hz, then in most cases light frequency is 120Hz. If you use 24p mode on the camera there should not be visible any high-speed flickering with any shutter speed. Of course, as soon as the local AC frequency is not 2-times higher than camera's frame rate, there might be problems with some shutter speeds.
 
In a word, you have to lower your shutter to hide the flicker, try a shutter under 50.
This issue has been present even with film camera and is not a recent problem. The only way ok detecting it. Know the light sources in your environment and do a test if not sure. Neon and LED lighting can produce this kind of flicker (and may not in some other conditions)
 
flicker can become more pronounced due to rolling shutter though. Be it a flash, or anything of that nature.
 
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