Alstar Bahtinov Mask - Bundle with - 1.25Inch Metal Collimating Cheshire Eyepiece - A ALSTAR

• 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 105 to 150 mm The masks grip the telescope tube gently but firmly with three metal posts which have non scratching silicon sleeves. protect you valued telescope surface. Prevents slippage. Allow the mask to remaining perfectly central because of this 3 post mounting The short collimator for mirror or reflector telescopes has a 45 degree plate for easier visual accuracy Fits in 1.25 inch focusers and easy to use. simply cap the telescope. remove the diagonal. and place the eyepiece directly in the focuser