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Thanks for that Matt.
When we view a star at infinity, the incoming rays are parallel, and fall on the SCT main mirror with everything (hopefully) optimised.
As we focus on closer and closer objects, the light cone gets steeper and I'm wondering if we are now using the extreme edge of the mirror, which was perhaps masked when viewing objects at infinity?
I'll take a look down the front of my OTA over the next couple of days, just to see how the whole set up looks, racked in and racked out. Can't do much else right now 'cos of the clouds.
Interesting stuff eh - there's always something to learn isn't there?
Cheers
Dennis
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