All focusers come with a 1.25"-2" adapter with brass compression rings in the 1.25" adapter as well as in the 2" focuser barrel. These focusers will fit many models of telescopes on today's market with absolutely no modifications.
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 (shown on the top right of the focuser in the photo above). However, please note that this is a relatively weak feature of this otherwise excellent product. 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. This is probably a minor annoyance since most of us will not use this feature very often.
- Standard adapter bushing included with the focuser (86.1mm diameter) will fit most imported 80mm and 90mm refractor telescopes with a tube inner diameter of 86mm - 88mm.
- For help in selecting a GSO Crayford focuser for your telescope,
click here. For photos of customer installations of this focuser,
click here.
- The focuser is easily attached to the telescope with three M4 screws (not included) spaced 120 degrees apart on the flange.
- The inner barrel is anodized black and features laser-etched scale.
- Models with integrated 96mm and 112mm rotatable telescope adapters are also available.
- Used with Antares adapter rings (sold separately), can be attached to Synta refractors (including Celestron, Konus, Orions and Skywatcher). Rotation feature is maintained when these are used with Antares adapters available for tubes of various sizes.
- Adapter rings are available separately for 102mm (4.01"), 120mm (4.72") and 150mm (5.91") refractor telescopes. The outer diameters of these rings (equal to the inner diameter of the telescope tubes on these telescopes) are 3.8", 4.4" and 5.4" respectively. The 102mm adapter is required for the ED80 refractor.
