GSO 2" Crayford Focuser for Reflectors - Single Speed
Brand | GSO |
Part Number | - |
Availability | available |
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Product Info
Manufacturer Description
This very high quality, single-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 greatly aid in achieving precise focus for visual observations and astrophotography and you will experience very smooth and precisely controlled focuser motion with zero backlash and zero image shift.
CNC machined from aluminum and anodized black, this focuser comes with a base plate to attach to your reflector telescope. The inner drawtube glides on 4 precision bearings and a roller shaft and provides 35mm of focus travel. The inner barrel is baffled and painted a flat black to minimize reflections for maximum contrast.
The 2" focuser barrel features a brass compression ring so your eyepieces and other accessories will not be marred by the set-screw. Also included is a 1.25"-2" adapter with brass compression rings that is threaded to accept standard 2" filters.
The focuser also has two large thumbscrews. The thumbscrew on the telescope side can be used to lock the focuser, allowing the use of heavy accessories or cameras without fear or slippage or losing focus. The other thumbscrew on the eyepiece end can be used to adjust the tension of the focuser to achieve a focusing "feel" that you like. At the easiest (lightest) setting, the focuser moves extremely smoothly. At tighter settings, you can still use heavier accessories without sacrificing much of the smooth focuser action. GSO's rated load capacity for their Crayford focusers is a little less than 6 lbs (2.7 kgs).
Focuser Specifications (With 8"/10" Base Plate):
• Minimum focuser height (with 1.25" adapter) = 3.23" (82mm)
• Maximum focuser height (with 1.25" adapter) = 4.61" (117mm)
• Minimum focuser height (without 1.25" adapter) = 2.83" (72mm)
• Maximum focuser height (without 1.25" adapter) = 4.21" (107mm)
• Tube travel = 1.38" (35mm)
• Focuser weight (with 1.25" adapter) = 1lb-6.7oz (643gm)
• Focus knob diameter = 1.57" (40mm)
• Microfocus knob diameter = N/A
• Maximum outer drawtube diameter = 3.15" (80mm)
• Millimeter markings on focuser drawtube: No
• 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
Please note: Most GSO Crayford focusers have or will soon develop two bearing marks/lines on the upper side of the drawtube. This is caused by wear on the barrel anodizing where is makes contact with the roller bearings. In some focusers, you have to look hard to find these marks. In others, it is very prominent, even for brand new items received from GSO. This does not indicate a defective or used product and is essentially just cosmetic.
Reviews
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Oct 13, 2017
Quality focuser
Pros: Cons: Comments:This single speed focuser I purchase to replace an older style screw tube focuser on a Meade 6SN. This was a manual fork tube mount, so I wanted just a good quality, modestly priced focuser. (didn't need dual speed, short base, etc.). This will make this telescope more user friendly now for switching eyepieces and refocusing with the crayford style tube. Construction is quite good and I have no complaints for its intended application.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Fred Mullins Member
- Skill Level
- Unknown
- Time with Product
- Unknown
- User Notes:
- Review by Fast Freddy of Charleston, WV.
Apr 25, 2011Smooth Performer
Pros:Strong Construction
Cons:Heavy
Comments:Replaced a well known brand rack and pinion focuser on my 10" hybrid reflector with this unit. The extra mass required a counterweight increase but not excessively so. Focuser is very smooth in operation and great for CCD camera work, but came with two(of the original four) base attachment set screws missing. Otherwise I'm happy with the unit and can readily fix the base attachment issue.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Aug 18, 2009Very worthwhile upgrade
Pros:Smooth,Solid build
Cons: Comments:No bells or whistles, just a solid performer. The drawtube is held firmly in place, making precise focus for lunar/planetary viewing much easier to achieve. Noticed a big improvement in collimation, as well. Overall, this focuser improved my entire 'scope and, therefore, my enjoyment of astronomy. Definitely money well spent.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
Feb 2, 2009GSO Crayford Focuser for Reflectors
Pros:Zero backlash,Very nice upgrade,Smooth finish
Cons:No bad reviews
Comments:Nice upgrade from the rack-and-pinion focusers!! Zero backlash which makes it the best for the buck when it comes to CCD images! 2" to 1.25" adapter holds the eyepiece right in place unlike some other 2" focusers I've had!! Very nice looking also :-)
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
May 9, 2007GSO Crayford Focuser for Reflectors - Single Speed
Pros:Zero backlash, smooth finish, very nice upgrade!!
Cons:No bad reviews!!
Comments:Nice upgrade from the rack-and-pinion focusers!! Zero backlash which makes it the best for the buck when it comes to CCD images! 2" to 1.25" adapter holds the eyepiece right in place unlike some other 2" focusers I've had!! Very nice looking also :-)
Bottom Line: Would you recommend this item? YesSort bySpecifications
Manufacturer GSO Focuser Telescope Type Reflector