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Customers most agreed on the following attributes:
from Preston - lancahire- UK on 12/27/2011
Comments about GSO GSO Crayford Focuser for Refractors - Single Speed (with 86mm Telescope Adapter):
I did not understand the use of the word - buttery- thought it was a silly non engineering term. But yes the feeling is both buttery and precise. All telescopes should have a focus mount like this one, I am absolutely delighted, and it was well worth ordering it from America.
from Brazil on 11/1/2011
Comments about GSO GSO Crayford Focuser for Refractors - Single Speed (with 86mm Telescope Adapter):
If one wants to build a quality refractor, just add a tube and a 80 mm lens and here you go!
[1 of 1 customers found this review helpful]
from lansing, michigan on 7/30/2011
Comments about GSO GSO Crayford Focuser for Refractors - Single Speed (with 86mm Telescope Adapter):
I purchased the GSO single speed focuser as a replacement for my Orion ST80; it arrived from Agena well-packed and lightning fast.
This is a drop-in replacement for the stock focuser: the screw holes lined up absolutely PERFECT and the stock screws were exactly correct for the new focuser. Absolutely nothing had to be forced, tweaked, or fudged.
There are 4 hex head set screws (requires 2mm wrench) that allow you to rotate the focuser to the desired position for your particular mount.
Fit and finish of this focuser is excellent (like every other GSO piece of equipment I have ever owned). I do not currently have a 2" diagonal, but with a 1.25" diagonal and a (heavy) 40mm eyepiece there is no play or wiggle whatsoever. Focus is very smooth, no tight or loose spots.
My 8" Dob came with a GSO dual speed focuser and I noticed that it was so smooth and precise I seldom use the fine focus knob. Therefore when it was time to upgrade the Orion, I opted for the single speed because I am on a budget and would rather spend the savings on another EP (besides, it can always be upgraded to a dual speed at a later date).
The product description indicates you may loose some outward focus travel; I am happy to say that with the ST80 I gained about 4mm out-focus and about 9mm in-focus (with the 1.25 adapter in place; without the adapter you would loose only 1 or 2 mm of outward travel). In other words, I have more focus travel than the stock unit, which means I can use every combination of diagonal (mirror or prism), eyepiece, or barlow and reach focus every time, no adapter needed.
The ST80 always was a decent performer at low powers, but the sloppy stock focuser could be frustrating and made it feel like a toy. Now it feels (and looks) like a precision instrument.
from UK on 6/4/2011
Comments about GSO GSO Crayford Focuser for Refractors - Single Speed (with 86mm Telescope Adapter):
I used this to replace the cheap plastic focuser on a Meade 2090 refractor. [...]
from Saxony/Germany on 4/18/2011
Comments about GSO GSO Crayford Focuser for Refractors - Single Speed (with 86mm Telescope Adapter):
I have upgrading the original rack&pinion focuser from 80/910 achromat with this item and have not regretted the purchase. The focusing is functionaly and stable with my long sun-prominence-filter-assembly(~3 pounds).