Astromania Bahtinov Mask Focusing Mask for Telescopes - Bundle with - 1.25" High Precision Double Helical Focuser with 0.05mm Scale

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High Precision double helical focuser for guider scope and finder scope Interface; the solution for telescopes or telephoto lenses with sluggish focusing; the Focuser has a fixed orientation so there is no rotation of mounted cameras or eyepieces or also the field of view with your guide star when focusing
Upgrade your R&P focuser by adding it to the end of the R&P focuser by using "Astromania M42X0.75 Female to M42X0.75 Female Thread Telescope Adapter 9mm"; note: please make sure that there is M42X0.75 male thread on your R&P focuser
Item was made by Full metal durable the one side of double helical focuser is M31X0.5 male thread "including a M31X0.5 female thread to M42X0.75 male thread Adapter which you can get M31X0.5 male thread or M42X0.75 male thread on this side" there are 1.25" accessory collar with male T-thread flange "M42X0.75" and Accesory collar thumbscrews on the other side that you can install StarShoot AutoGuider or 1.25" eyepiece
Bahtinov masks take the guesswork out of focusing and even get over the seeing conditions as it is a mathematical type approach to the task; the best focus for your telescope quickly and easily; suitable for use on all types of telescope reflectors rafractors Dobsonians Mak-Cas and SCTs; they are made from precision laser cut enforced plexiglass; which is stiff and long lasting; they will never be brittle in the cold; unlike some other masks which are made from normal plastics
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 "contact us if you are not sure where to measure"