This is bad and driving me crazy.
I have been playing with my spacing of FR lately along with dabbling with OAG which is on hold for the time being. I had a pretty good night out last night as far as guiding, plate solve and autofocus but everything I have seen has the "shadow" of the secondary showing up in it although it is not the 1st time I've had this lately, but it's really getting old.
I thought is was purely from my flats but it's also in stacks not using flats.
Is this a matter of spacing at all or could the scope setup be that sensitive to collimation, which I know is not perfect.
Here's a few samples.
My flats are normally taken before dark using a new run of SGP's flats cal wizard to assure the right setting, then take bias & dark while waiting on dark skys.
Could it be the flats make it worse when taken to the east but much of the imaging is "now" done to the west?
This is really becoming a major hindrance, even more than using an AVX