Bahtinov mask CUSTOM size for telescope or camera lens

Product code: BAT-CUSTOM
in stock
£25.00 UK Price
£20.83 (ex. VAT) International Price
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Product information

We can make a custom mask for you. Maximum diameter is 200mm.

Please enter the following information in the order comments field on checkout:

  • Telescope or camera lens make and model
  • Dewshield Diameter in mm (this will determine the inner diameter of the item so should be as  accurate as possible for a good fit).
  • Aperture in mm
  • Focal length in mm (this will determine the pattern type)

Please note: Product colour may vary.

The Bahtinov Mask is a great accessory to get the sharpest focus for your telescope quickly and easily.

Credit goes to Russian amateur astronomer Pavel Bahtinov for making his idea available to the astronomy community. Masks help you get sharper stars in images, by making focusing easier.

When in place, the Bahtinov forms a pattern of spikes or "rays" of light around a star or any point light source, easily visible in your camera in live view mode or eyepiece. (See the thumbnail images for examples). When the pattern becomes perfectly symmetrical, the telescope is perfectly in focus.

Even with a difference in focuser position of only a few tenths of a millimetre, the pattern of rays created changes significantly. This sensitivity means less time hunting for best focus. There's no more need to guess when you are focused during times of poor to moderate seeing. Simply put the mask, and the status of your focus will become immediately obvious.

Focusing is quick and easy saving you time hunting back and forth to find the optimum focus, because the pattern formed by the mask is easier to see, than trying to judge the size of a tiny point source of light.

Product Info

Brand Altair
Product Code BAT-CUSTOM
Delivery Weight Package