Quote:
Originally Posted by multiweb
The field looks pretty good. You'll nail it when you get your MPCC spacing spacing right. Get into flat fielding as well. If you're using a newt check the offset during collimation as you have uneven illumination.
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Yes - it's an 8" f6 Newt.
Obviously I didn't take any flats.
Yes - My collimation needs tweaking.
I just moved the mirror up on 3 out of 6 bolts to obtain focus.
( 3 L brackets that normally have 2 bolts in each)
I did collimate it with a laser afterwards but it needs off setting too.
What causes the doughnuts?
Could it be a relection off the OAG?