Thanks to folks who chimed in on this thread. It turns out the
issue is not due to autoexposure on the GH2. Rather, according to the
DP, "the lens used didn't have an aperture ring so the aperture had to
manipulated via the camera and not the lens - and unfortunately the
system has click stops so isn't very smooth."
The BCC flickerfix effect wasn't much help with fixing the problem.
Sapphire's flicker removal filter worked quite well for smoothing
out single exposure jumps, where the change occurs over 1 frame. Where
the shift took 2 frames, the jump was still pretty visible. Problem
with this footage is there are about 8 exposure changes over the course
of 10 seconds, with the camera moving. Using the sapphire plugin to
match to exposure levels at the end of the shifts, for instance, means
the footage at the start of the shift gets compressed to a very narrow
range of luma values. It can be stretched out again via CC, but is very
degraded -- tons of banding. I think this could be minimized by working
in a higher bit-depth. It seems like the Sapphire filters support
floating point in After Effects, so that might be worth a try.
Cheers,
--Michael Brockington
On 12-07-31 11:50 AM, Michael Brockington wrote:
>
> I have some footage from a Panasonic GH-2. When it pans from light to
> dark areas, it shows a very step-wise change in exposure, rather than a
> smooth change. Exposure jumps from 1 setting to the next over 1-2 frames.
>
> Is this a known issue with the camera, or more of an operator issue?
>
> Has anyone come across a good solution for smoothing out this kind of
> thing? I suppose I could use add-edits at the jumps with CC to try to
> match the 2 exposures, but it looks fairly difficult to get the match to
> be imperceptible when the shot is continuous.
>
> Any magic plugins to recommend, either inside Avid, or using some other
> software?
>
> Thanks,
> --Michael Brockington
>
>
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