This is all good stuff chaps, keep it rolling
When I started taking snaps a couple of months back I wasn't sure about the diagrams for my kit. My refractor specifies 68.32mm or something ridiculous, so naturally I added a 12.5mm spacer into the optical path, but the stars are all funny out to the edge. Not using the spacer gives acceptable results (to me!)
Same for my Edge 8...I recently took some shots from Bretti and kicked myself when I saw them on the computer because I'd left the extension tube on by accident which meant my optical path was about 30mm too long for my Edge 8 + reducer, so there's ugly coma outside of the centre circle
For this scope, Celestron specify 105mm +/- 0.5mm - how practical is that!?!?