I have been plodding along with my Canon DSLR for some time now, and that’s gone reasonably well. So as a next step I got myself a ZWO ASI462MC. However I am having problems achieving focus, especially with a Barlow attached. I suspect it is something to do with back focus, and I have searched high and low for info on this, but to no avail, with the result that I am pretty much stuck and each session ends with me ditching the Astro camera and running for my DSLR in the hope that I can at least capture something for my night’s work.
so, basically, this is where I am:
I attach the nosepiece to the camera, put it into the diagonal - cannot see anything.
Remove the diagonal and insert the nosepiece directly into the visual back, can achieve focus.
Insert the nosepiece into a Barlow 2x lens and insert the Barlow into the visual back- can get some way towards focus but never reach it before it starts going out of focus again. (Technically I know it should be a 1.5x with this camera, but I am told that with good seeing it should push to a 2x with good results).
As I said I can’t find anything on this. How do I set up this camera for use with a 2x Barlow and Celestron 9.25 SCT?? I am using Sharpcap for capturing.
Thanks for any tips!