Do any of you have focuser recommendations for an 8" (tube diameter 254mm) I am mainly after a rack and pinion 1.25" and 2" preferred. I have emailed Matthew Lovell of telescopes-astronomy for his recommendation on one he sells (1.25"/2" RACK & PINION FOCUSERS $90AUD$ OR $54US$) About my price range. unless I can get a crayford for the same price
Any help appreciated, I just want a dedicated focuser for my dob, instead of using the one off the TAL-1 which is moulded for a smaller tube.
I think that Mike will agree with me that you should get Moonlite CR2 focusor. When I was visiting Mike he showed me the Moonlite installed on his scope. I must say just by handling it in daylight, it felt extremely smooth. It has a course focus which is fast and a fine focus which is very smooth. Mike could tell you so much more. I must say that I have a crayford focusor on my Orion 80mm ED and it was not as smooth as the Moonlite.
Anyway I suggest that you ask Mike for more detail.
Andrew, GSO is Guan Sheng Optics. They make all the GSO dobs we all own and buy from Andrews and Bintel. Good quality stuff for a good price.
If you're on a budget, the GSO crayford $99 is the way to go.
If you want to spend a bit more for better quality and a fine focus knob, get a moonlite. They're not cheap, but they really are good. Check out my moonlite upgrade page.
I bought the unit 2nd hand from Vermin, and then bought the install kit from DBA Astronomy in the US (link is on that page). You can get the whole units from them, or from the moonlite company main page.
So yes, overseas is really the only way to get these.
Yes, I have Guan Sheng 2" (with 1.25" adaptor) Newtonian focusers in stock at $99. I have Guan Sheng Crayford style focusers due into stock again about the end of this month at $149. I have generic Crayford style focusers (same quality) in stock now for $149.
Please add $11 for registered mail -or- express mail costs to Adelaide.
So I am guessing a newtonian focuser is a Helical or rack and pinion. See how I go saving to $150