Tag Archives: M37

Image Testing evening

It’s clear tonight and no moon, temperature about 0 C. I used the evening to start testing out the wide-field imaging train.

I eventually plan to image with the C9.25 and, for that, will use the Van Slyke off-axis guider to avoid differential flexure of a guide scope.  I tried that tonight with the SV80 refractor. It didn’t work – there isn’t enough back-focus in the refractor to hold the large VSI OAG.  I tried the old Mead OAG and it works ok, except I couldn’t find a way to attach it to the filter wheel – so I did some tests of straight monochrome imaging and OA guiding. Continue reading