Hi,
I have a WO Crayford Focusser for my C8 SCT - I also have a Bintel Crayford Focusser - Need to decide which one to keep, and also settle my mind about their strength etc.
They are a both in great condition and both pretty much seem to work the same (10:1 etc) however the Bintel one screws all the way on to the visual back - the collar is then flush with the rear of the scope- the WO one has a silver collar and only screws part way on to the thread before it runs up against an internal 'stop' and has no more thread anyway - (see images below)
They both SEEM to be secure on the rear of the C8 and cope with a 2" diagonal and some hefty eyepieces OK but I am wondering is this usual with WO SCT Crayfords?
I also just got a focus motor and it only fits that WO not the Bintel (Bintel shaft is thicker!) so I'm planning to keep the WO - any comments or advice?
Thanks
Chris