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Niklas Holsti wrote:

On 16-08-16 21:22 , Rick Jones wrote:
I was watching the technical webcast for JCSAT
https://www.youtube.com/watch?v=OERDIFnFvHs and during the second
stage burn, noticed something I cannot explain - it would seem that
for about ten seconds at a time, there would be some "lights" showing
on the dark "upper" portion of the bell. Then for about ten seconds
they would not be there. Lather, rinse, repeat. This also seems to
correlate with a step/shudder in the image.

Perhaps they are switching every 10 seconds between two different
cameras, one on each side of the engine, but with slight difference in
alignment so that the bell seems to "step" a little?

Yes they are. If you dig out one of the daylight launches you see Earth
changing position each time the camera switches.

Anthony