![]() This is probably a minor annoyance since most people will not use this feature very often. We inspect every single focuser and tweak/lube it as much as we can, but the rotation is often not smooth over the entire 360-degrees and may bind in a few spots, requiring additional effort to rotate it. However, please note that this is a relatively weak feature of this otherwise excellent product. These focusers are rotatable, i.e., you can turn the entire focuser body/diagonal/eyepiece combination into a better observing position by loosening or tightening a large silver thumbscrew on the top of the focuser. GSO's rated load capacity for their Crayford focusers is about 6 lbs (2.7 kgs). At tighter settings, you can still use heavier accessories without sacrificing much of the smooth focuser action. At the easiest (lightest) setting, the focuser moves extremely smoothly. 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. 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 focuser has two large thumbscrews on the underside. The inner draw-tube barrel is anodized black and features a laser-etched scale. Also included is a 1.25"-2" adapter with brass compression rings that is threaded to accept standard 2" filters. ![]() The 2" focuser barrel features a brass compression ring so your eyepieces and other accessories will not be marred by the set-screw. The inner barrel is baffled and painted a flat black to minimize reflections for maximum contrast. The inner drawtube glides on 4 precision bearings and a roller shaft and provides 79mm (3.11") of focus travel. High-Quality Construction and FeaturesĬNC machined from aluminum and anodized black, this focuser comes with a base plate adapter to attach to refractor telescopes. The Crayford style focusing control makes 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.Ģ. You will wonder how you ever lived without it once you install it! This very high quality, dual-speed Crayford focuser for refractor telescopes from Guan Sheng Optical (GSO) is beautifully machined and a joy to use.
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