Why are M72x1 extension tubes so rare, if non-existent?
Or.. even M54x0.75 would work.
I'm trying to mate the QHY268M+FW to a FS128.
I have a CA-35 which brings M72x1 to M54x0.75(female).
I figure I can add a M54 male/male adapter and mount the camera+fw solid... no 2" nosepiece needed.
(Downside tho is this OTA does not have a Camera rotator, but I'm willing to deal with that for the time being.)
However, I need to add a bit of spacing so the focuser doesn't have to be racked out so far.
(Those focusers aren't exactly rock-solid, and I'd rather not replace it at the moment.)