[MelD (Melvyn)]

Hi All.
I have a 714mm 102 Orion Triplet (CF) on an AZ/EQ6 GT mount. The imaging chain is:
a 2" Vixen flip mirror, a Xagyl 5-filter colour wheel, 1.25" Astronomik RGB filter set, then the ZWO at the end of the wheel. That gives me about 9 mm back focus on the draw tube.
I am using the latest version of FireCapture.
Any ideas why I am getting tiny (half frame) "porthole" Luna images? I thought I might be up for 2" filters and wheel but thankfully that does not appear to be necessary. But it does appear that something is masking the image.
I am using FireCapture's Moon preset.
Advice will be greatly appreciated.
Thanks,
Mel