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Elongated stars after dither?
Hi all,
Having a quick look through my raw, uncalibrated light frames, I have noticed a trend with elongated stars. I dither every 2 frames using NINA, and have noticed that each frame following a dither has elongated stars. Not disastrously elongated, but enough to want to throw out those frames. The following frame always contains pretty much perfectly round stars.
Could my camera be starting exposure too early after the dither while the OTA is still vibrating from the dither? Or worse, exposing during the dither? This is terribly frustrating as I have noticed this 2 nights in a row now and feel like throwing out 50% of my frames. I could just dither every, say, 5 frames instead, but I would rather fix the issue if I can.
Below on the left is a typical frame immediately following a dither. On the right, the following frame.
Comments are most welcome!!
Many thanks,
Stéphane
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