Page 1 of 1
Helical focuser on a 1-speed R&P?
Posted: Wed Oct 19, 2022 1:39 pm
by pakarinen
Has anybody used a helical focuser with a single-speed R&P for fine focusing? Would that even work? Seems like it would in theory, but I know nada about helical focusers. Crazy idea?
Re: Helical focuser on a 1-speed R&P?
Posted: Wed Oct 19, 2022 4:31 pm
by notFritzArgelander
Not crazy at all.
Re: Helical focuser on a 1-speed R&P?
Posted: Wed Oct 19, 2022 6:15 pm
by Lady Fraktor
Helical focusers are great for fine focus.
I think you will like using one.
Were you looking at a specific brand?
Re: Helical focuser on a 1-speed R&P?
Posted: Wed Oct 19, 2022 6:52 pm
by Bigzmey
I have Baader T2 diagonals (with helical focuser built in the
EP holder) on a few scopes. Works nicely for fine focusing.
https://agenaastro.com/baader-1-25-t2-e ... cuser.html
Re: Helical focuser on a 1-speed R&P?
Posted: Fri Oct 21, 2022 6:01 pm
by pakarinen
Well, fuh on me. I found a
RACI diagonal on Agena with a helical focuser - not looking at any specific brand. If I had known they existed / could be used with a single-speed for fine focus, I might not have bought Crayfords for my ST80 and ST120.
Live and learn...
I've been casually looking at some 90mm fracs, but most are single-speed and I didn't want to bother with potentially replacing a focuser, so I wrote them off. Maybe I should reconsider.
OTOH, I probably should get the tripod / mount combo for my 102ED figured out first.
Re: Helical focuser on a 1-speed R&P?
Posted: Fri Oct 21, 2022 6:16 pm
by Bigzmey
pakarinen wrote: ↑Fri Oct 21, 2022 6:01 pm
Well, fuh on me. I found a RACI diagonal on Agena with a helical focuser - not looking at any specific brand. If I had known they existed / could be used with a single-speed for fine focus, I might not have bought Crayfords for my ST80 and ST120.
Live and learn...
I've been casually looking at some 90mm fracs, but most are single-speed and I didn't want to bother with potentially replacing a focuser, so I wrote them off. Maybe I should reconsider.
OTOH, I probably should get the tripod / mount combo for my 102ED figured out first.
One benefits from a good focuser in other ways, not just for fine focus. Better alignment, larger payload, diagonal rotation, no slope.