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Marc and Alex
thanks for your time on this.
There are a few interesting ones there Marc - might make a good thread actually. We can call it Bring Out Your Dead. I have a few more to add believe me.
Looking at Marc's examples it seems my shot is closest to the fourth.
If I'm right, its a result of placing the MPCC too close to the focal plane. Happily that matches Alex's diagnosis.
I am having a motor fitted to the focuser in the next week or 2 so I'll have the Bintel boys check my collimation. And I agree that the polar alignment wasn't perfect which shouldn't be too hard to sort next time I am outside (damn clouds!).
I'll report back when I make some changes with the spacing.
Alex, on the FW, I'll email your fellow to see what he can do about an adapter and also contact SBIG direct. The yard certainly isn't big enough to satisfy the desire to have burn with the new vehicle as it is.
Pete
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