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Horizontal banding

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John Delonghi:
I got some horizontal banding today while running some tests. It was approx. 1.5 deg C if that makes a difference. I saw the same effect an all clips. Width/relative position of band changed when I changed vertical resolution.



What should I check?

tesla500:
That looks like the shutter line artifact. I think what happened is you changed the shutter speed and didn't do a black cal. Try again, making sure to do a black cal after any shutter speed change. This isn't such an issue at full horizontal resolution, but at reduced resolution it's important.

John Delonghi:
I definitely did a black cal after every change I made and this happened on every clip (about 20) with different resolutions and frame rates. I even turned the camera off and on twice to try and clear it.

Maybe I should have done a proper re-boot, but I thought it had cleared viewing on the built in monitor. Only when I got back and looked at all the clips on a bigger monitor could I see it affected all of them.

I've turned the camera on now and the band is still there, so is there anything you want me to do to try and figure out what's happened and how to avoid it happening in the future?

tesla500:
Does either the top or bottom of the band move when you move the shutter slider?

John Delonghi:
Yes it does.

It almost seems as though the black cal. setting is being forgotten some time after setting it.

I just did a black cal and left the camera on (not recording) and when I came back 5 minutes later the horizontal band had appeared again.

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