Internal reflections

[peter_4059 (Peter)]

I'm seeking some advice on internal reflections in the imaging train - just wondering if there is any information out there on how to track down the cause and potentially eliminate them. This image was taken with my SN10 with a Televue Paracorr and QSI683. Only an issue near a bright star so far but it would be good if there is a simple fix.

[multiweb (Marc)]

That looks like those Schmidt reflections with the hyperstar. Same shape. The only way to get rid of them is offset then reject at stacking time.

[peter_4059 (Peter)]

Does that mean it is created by light reflecting off the inside of the corrector plate?

[peter_4059 (Peter)]

It does look a lot like the one in this link...

http://www.robertreeves.com/repair1.htm

[FrankyT (Frank)]

This is probably irrelevant - I have a an 8 inch f5 reflector and when I use the f5 coma corrector I get reflections of bright stars when they are in the field of view. I havent worked out why it happens but are you using a coma corrector? If so try without it.

[peter_4059 (Peter)]

Yes - I'm using a Televue Paracorr.