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The WO 66 Petzval does require the longer light path of a 2” diagonal in order for it to come to focus. This was explained to me by Ron at Sirius Optics when I purchased mine some 5 or 6 years ago.
However, I have found that it does come to focus with my Orion Deep Space Star Shoot CCD camera (1st generation) using a Takahashi 1 ¼ inch prism diagonal (i.e. not a mirror) – the longer light path through the prism makes this possible. I haven’t tried it with an eyepiece though.
Cheers
Dennis
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