Re: Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1
The helical focuser adds no extra length since you move the tube in further to accomodate it. The tube ends exactly in the same place as before inside of the extension at the end and is much easier to focus.toggle quoted messageShow quoted text
Adding a Crayford focuser will make the system unstable (flex) and defeat the purpose of the finder as a guide scope.
From: George <george@...>
To: firstname.lastname@example.org <email@example.com>
Sent: Wed, Oct 14, 2020 4:21 pm
Subject: Re: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1
As a reminder, the Baader finder uses the locking ring and lens as a fine focuser.
Phone: 815-222-6538 (direct line)
Phone: 815-282-1513 (office)
I don’t know about a Crayford style focuser, but Baader makes nice helical focusers for the Vario-Finder. The one I have is a 1.25” eyepiece holder with helical focuser built into it.
Unfortunately I’m not home now and can’t give you the Baader part number. But it’s NOT the stock one that comes with the Vario-Finder. As I recall it’s T2 thread at the scope side – so it just threads on. And unlike another 1.25” adapter for that scope from Baader, this one has a much longer 1.25” throat – so eyepieces or camera nosepieces don’t wobble nearly as much as Baader’s very short 1.25” adapter.
I would like to replace the sliding focuser on my Vario-Finder (10x60; 61x250 f/4.1) scope with a Crayford style focuser.
Does anyone have a suggestion?
Robert J. Bridges
Physiology and Biophysics
Chicago Medical School
3333 Green Bay Rd
North Chicago, Il 60064
Office: 847 578 3273