rscheffler
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ISO1600 wrote:
If it is indeed using the FP sensor with no changes to readout speed, that is disappointing. MOST of the time, it was not an issue, but handheld video would get wobbly, and I would often get banding under artificial light that could get pretty ugly. I don't like having to work around those kind of limitations, especially on a not-insignificantly priced camera.
Malabito wrote:
So, it was not an issue for photography, but it was for video?
Are you planning to do video with the pixii?
Please note ISO1600's point about two distinct effects that result from the slow sensor scan speeds. There is the rolling shutter 'jello' effect that is getting most of the attention, but also banding under artificial lighting that can become very noticeable and impossible to ignore.
Rolling shutter distortion will be more prevalent the lower the sensor scan speed but is often disguised in a given image unless there are other images from a sequence as points of reference. And what is video other than high frame rate stills sequences?
I don't usually see rolling shutter effects in stills from my Canon cameras with 1/60 sensor scan speeds. But it becomes more noticeable when culling sports sequences shot at 20 or 40 fps. For example, if a running athlete suddenly changed direction during a sequence, rolling shutter distortion on parts of their body is noticeable when compared against other images in the sequence. However, this distortion usually isn't obvious when viewing the stills in isolation. That's at 1/60. Drop to 1/15 and IMO rolling shutter distortion will become more noticeable in standalone images when content is moving in such a manner that it's 'out of sync' with the e-shutter, for lack of a better description. For example, a certain kind of rapid movement might result in more visible distortion in a vertical photo than horizontal because the sensor scans in a specific direction that might be 'blind' to the movement in one orientation but not the other.
Regarding banding - in one of my Canon cameras there is a 'high speed flicker compensation' setting where the camera analyzes the cycle rate of the light source and recommends a custom shutter speed to eliminate the banding. It actually works really well, for example fixing banding of LED display boards, LED theatrical lighting and video projection systems. But it can only fix one cycle rate if there is more than one in the scene. It also appears to only work with cycle rates higher than typical 50/60Hz alternating current cycle rates used by many common light sources.
We should ask Juha about his day to day experiences using the Sigma fp while wandering the streets of Tokyo. It's probably a use case shared by many interested in this camera.
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