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This is a 2" GSO focuser for Reflectors in pristine, perfect condition. We do not believe the previous owner ever used this. Includes the original box and foam.
The box says that this is specifically for a 303mm reflector OTA. That would correspond to a 10-inch reflector. Be sure that that's what you have, because there are no returns on used items. These appear to be sold out everywhere; the copy below is from a similar-looking item being sold on eBay. The specifications there may or may not be correct.
Because the world of 10-inch reflectors is pretty limited, we have priced this to move at just $100.
This very high quality, dual-speed Crayford focuser for reflector telescopes from Guan Sheng Optical (GSO) is a joy to use. You will wonder how you ever lived without it once you install it! It will make achieving precise focus for visual observations and astrophotography a breeze and you will experience very smooth and precisely controlled focuser motion with zero backlash and zero image shift.
Focuser Specifications (With Curved Base Plate):
Minimum focuser height (with 1.25" adapter) = 3.27" (83mm)
Maximum focuser height (with 1.25" adapter) = 4.84" (123mm)
Minimum focuser height (without 1.25" adapter) = 2.87" (73mm)
Maximum focuser height (without 1.25" adapter) = 4.45" (113mm)
Tube travel = 1.57" (40mm)
Drawtube outer diameter (cut-out in your telescope tube must exceed this) = 2.29" (58.1mm)
Focuser weight (with 1.25" adapter) = 1lb-10.5oz (751gm)
Focus knob diameter = 1.57" (40mm)
Microfocuser knob diameter = 1.02" (26mm)
Microfocuser reduction ratio = 1:10
Maximum outer body diameter = 3.15" (80mm)
Millimeter markings on focuser drawtube: Yes
Rotatable: No (But body can be rotated by loosening two allen screws that connect the focuser to the base plate)
Dust plug: One 1.25" dust plug included
2" to 1.25" adaptor with compression ring and 2" filter thread