When i push my (and others') scopes to see their capability, i often get the mag up to about 50X/inch. So for the baader perhaps ~180X which is a 0.5mm exit pupil.
I seem to find that it pulls out the differences in the quality of the optics from that point. Of course, perhaps my eyes are so bad that i need that image scale to 'see' those differences that others can see at lower mags. But it would be great to hear your thoughts at these mags.
ps. Gavster was it you that bought an AP130GTX like me from Skypoint?
I find a 0.5 exit pupil pushing it for me due to eye floaters but I can give it a go. I have a 3mm and 4mm delite and a 3.5mm Pentax XW. Using the same eyepiece would give slightly different exit pupils and magnifications or I could match the magnifications but use different eyepieces (eg 3mm delite in Baader and 3.5mm Pentax in Stowaway).
Yes I got my Ap130gtx from Skypoint which was also where I got my Stowaway.