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Note: We have just received a new shipment of these focusers, and the inner drawtube (barrel) is now a beautiful, anodized black.
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.
CNC machined from aluminum and anodized black with a chrome-plated inner barrel, 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 40mm 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 comes with a curved base plate (available in 8"/10" and 12"
models) for mounting on many telescopes. Please make your size
selection while ordering this item. Flat bases are also available at an
additional charge. For help in deciding which base plate to choose
(including specifications and hole spacing), please click here.
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).
A "Low Profile" model is available for telescopes requiring more in-focus travel for
visual/imaging applications as compared to this regular model.
Focuser Specifications (With 8"/10" 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)
- Focuser weight (with 1.25" adapter) = 1lb-10.5oz (751gm)
- Focus knob diameter = 1.57" (40mm)
- Microfocus knob diameter = 1.02" (26mm)
- Maximum outer barrel 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
Description copyright: Agena
AstroProducts (2008). Reproduction without permission prohibited.
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