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Okay, I'm feeling a little foolish. I didn't realise you're supposed to *remove the tilt plate from the camera for my particular configuration. That saves me 5mm, and then the screw-in adapter accounts for the other 2mm. Solved!
Just to clarify though, the *camera manual says 55mm. The *telescope manual says 75mm, that's why I was trying for 75mm. Maybe different models have different BF? [Edit; it's 55mm from the back of the Field Corrector extender which, as you can imagine is exactly 20mm long]
I guess if my stars start looking like I'm shooting through a snowglobe, I'll know I'm doing something wrong!
Thanks for your help guys.
Markus
Last edited by Stonius; 06-10-2022 at 09:14 PM.
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