Astromania Bahtinov Focusing Mask for Astronomical Telescopes - FM80mm — Open-Box, 19% Off

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; they are made from precision laser cut enforced plexiglass that is stiff and long lasting; they will never be brittle in the cold; unlike some other masks which are made from normal plastics

The masks grip the telescope tube gently but firmly with three metal posts which have non-scratching silicon sleeves to protect valued telescope surface; mask remains centered since 3-post mounting; while fitting a wider range of telescopes

Made from 2mm thick laser cut plexiglass and securing screws are capped with soft plastic so that do not damage telescope; They have adjustment latitude of about 85-120mm that adjustable to fit optical tubes unlike masks which only fit one telescope

Please be assured these focusing masks will work excellently for both reflectors and refractors with whatever focal length; all you need to do is to measure telescope tube size and choose right size of mask contact us if not sure where to measure

The Bahtinov mask has become the preferred method of focusing a telescope, either visually or when imaging with a CCD camera, DSLR or webcam.They are an inexpensive tool which will allow you to achieve pin-sharp levels of focus, saving you time and improving your work. Simply place the mask over the front of your ‘scope, align the scope towards a star. The mask displays a unique diffraction profile; one part of the diffraction pattern moves in response to changes in focus and displays error as a displacement from a clearly defined point.Whether you’re doing planetary visual observing, planetary imaging,or deep sky imaging, the Bahtinov Mask is a great accessory to get the best focus for your telescope quickly and easily.These high quality Bahtinov masks are adjustable to fit a wide range of optical tubes, unlike masks which are only able to fit one telescope.The masks grip the telescope tube gently but firmly with three metal posts which have non-scratching silicon sleeves to protect you valued telescope surface. This prevents slippage, whilst allowing the mask to remaining perfectly central. Because of this 3-post mounting, the mask remains centered, whilst fitting a wider range of telescopes.There is a myth about different Bahtinov grating pattern is required for different focal length telescopes. There is no real practical reason for the use of special patterns for different telescope types and focal lengths. In fact, the frequency and angle of Bahtinov mask patterns aren’t really that important. The diffraction effect is so sensitive to changes in focus, that the results are excellent regardless. 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.