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Telescope Making - Focusers & Parts

ScopeTronix Newtonian Focusers

   ScopeTronix offers two sturdy cast aluminum Newtonian Focusers, a 1.25" model and a 2"/1.25" model. These focusers feature smooth rack and pinion motion with internal teflon strips that let the barrel move very smoothly without any backlash or side-play. The 2"/1.25" focuser comes with a precision made 1.25" adapter that allows you to use 1.25" eyepieces in your telescope. 2"/1.25" Focuser Specifications: Mount Radius 10", Minimum Height 2.7", Maximum Height 4.2", Included 1.25" adapter adds 0.4" to height. 1.25" Focuser Specifications: Mount Radius 8", Minimum Height 3", Maximum Height 5.5".

ScopeTronix 2"/1.25" Crayford Focuser

   This Crayford focuser features a friction-drive that lets the barrel move very smoothly without any backlash or side-play. The focuser includes a precision made 1.25" adapter that allows you to use 1.25" eyepieces in your telescope. Both 2" and 1.25" ports include a compression ring. Specifications: Mount Radius 8", Minimum Height 2.9", Maximum Height 4.2", Included 1.25" adapter adds 0.4" to height.

ScopeTronix 2"/1.25" Refractor Focuser

   Here's a solid cast aluminum rack and pinion focuser for a refractor. This focuser will fit a 90mm tube. It comes with a dovetail groove so you can mount a standard dovetail finderscope bracket. It has a great deal of travel and has very smooth motion utilizing internal teflon guides for zero backlash or side-play.

JMI NGF-DX3 2" Crayford Focuser

   The Next Generation Focuser (NGF) is a low-profile, friction-drive focuser designed for both the amateur and professional market. The highly acclaimed Crayford design permits tolerances up to 100 times better than conventional rack-and-pinion focusers. Zero image shift and zero backlash makes it fantastic for visual and photographic work and a must for CCD imaging.