Moire type pattern in solar image.

[Andonyx]

I had a very short time with a PST today. I used my Neximage 5 and registax and got a half-way decent shot, but I'm wondering what the moire pattern is from. I had too much glare on my computer screen to see it during recording, but it's not an artifact of Registax, as it's present throughout the original video file. I had a 2x barlow in and bin 4x. My best guess is the binning, but I didn't have time to try a 2x.

[D4N]

Looks like Newtons rings to me.

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[michael.h.f.wilkinson]

Newton rings I would say

[Merlin66]

This is the interference pattern caused by the very narrow Ha wavelength in the glass cover of the CCD chip.....

It can be very annoying!!

Not all cameras suffer this problem, some are better than others.

If you can slightly tilt the camera relative to the incoming beam, this changes the effective "thickness" of the glass cover, and can sometimes suppress the Newton Rings.

[David Smith]

I get this sometimes with my QHY camera. Tends to be worse with a barlow in place (I don't see it at all without the barlow) although some barlows seem to make it worse than others.

Allowing the image to drift across the sensor a little and then stacking the result also helps to reduce their prominence.

[teleskopjo]

Try defocussing far out enough to get an even background then save it as a flat and subtract it later.