These masks have a fine-grade pattern and are placed on the lens hood.

The pattern of the masks is calculated for the original focal length of 200mm with the classic Bahtinov factor of 150. By experience, these are the optimal parameters for focal lengths from 135-400mm. If you interested in other sizes and parameters, please use the custom-made masks offering

All masks can be optionally ordered with a storage box. It is a recommended option especially for larger lens hoods, since the fine and long bars of the mask pattern are more fragile in larger sizes.

Unlike other Bahtinov masks on the market, the Bahtinov pattern of these masks has been calculated and adapted specifically for focal lengths of DSLR or mirror-less camera lenses. Many other masks are actually designed for large telescopes with very large focal lengths resulting in a coarse Bahtinov pattern.

Please note that the mask will sit with a slight play on the lens hood. However, this does not affect the function of the mask in any way. Please note that the material of the mask is heat-sensitive and starts deforming at 60˚C and hotter. The mask should be not left, for example, in the sun. Well, this should not be a problem in astrophotography 🙂