Item was made by Full metal; The double helical focuser is M31x0.5 male thread and 1.25 inch accessory collar with M42x0.75 male T thread flange; Accesory collar thumbscrews that you can install StarShoot AutoGuider or 1.25 inch eyepiece
Upgrade your R/P focuser by adding it to the end of the R/P focuser by using Alstar M42X0.75 Female to M42X0.75 Female Thread Telescope Adapter 9 mm; Note: please make sure that there is M42X0.75 male thread on your R/P focuser
High Precision double helical focuser for guider scope / finder scope Interface; The solution for telescopes or telephoto lenses with sluggish focusing
Please be assured that these focusing masks will work excellently for both reflectors and refractors with whatever focal length; All you need to do is to measure your telescope tube size and choose the right size of the mask
They are made from 2 mm thick laser cut abs; Securing screws are capped with soft plastic so they do not damage your telescope; These Bahtinov masks are adjustable to fit a wide range of optical tubes; They have adjustment latitude of about 85 to 120 mm
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