[1600 MC Cooled] Strange stars ?

frankastro

Hello,

I use a 1600 MC Cooled on my Clestron C9 (focal 2350mm) and the shape of the stars is correct.

But, With my Megrez 72 (focal 345mm), I ve a strange picture :

stars.jpg

Is-it a problem of ratio pixel size / focal ?

Or a problem with my Megrez ?

Or a problem of the camera ?

An idea ?

Thank you.

james_screech

The halo around the stars in unfocused ir light. Try an ir blocking filter, I had the same issue with my asi120mm and finder guider. Adding a filter gave nice sharp stars.

James

frankastro

Yes !!! Thanks a lot for your tip !

It's perfect with a ircut 8-)

Thank again,

Frank

Support@ZWO

Great news.