After getting the new ASI 533mc to work, actually didn't need an extension tube as my previous questions were about focusing now i'm left with a few more questions.
I managed to get up and running using the ASI studio which seems a very uncomplicated way to do things after i've viewed a couple of other programs albeit probably good enough to get me started at least, my main questions are in relation to the histogram.
Having used a DSLR for a year this looks somewhat different and i'm not sure where i should be aiming to get my curves (see attached image), this seemed to be a decent exposure, does this histogram look where i should be aiming for exposure wise (about a 1/4 over from the left hand side), similar to the histogram on my DSLR?
Next question is about calibration frames, mainly flats, darks i assume should be same setup as the "Lights", however when shooting flats should i be looking for a matching histogram curve or slightly different I always shoot my lights with the DSLR to be 1/3 over from the left hand side.