3D printed accessories for hassle-free astrophotography

Made in Germany - Shipped from Germany

Custom fine-grade drop-in Bahtinov focusing mask for 50-95mm apertures

After quite a long trial-and-error (8-10 different masks with different patterns and manufacturing methods) and researching what fits best, I came up with design of a Bahtinov mask that meets all the characteristics so that I finally don’t have to worry about focusing anymore.

This mask can be used with photographic lenses and small refractors.

(use the arrows on the left and right sides in the middle of the frame to scroll through pictures)

What are the special characteristics of these mask?

  • The Bahtinov pattern has been specially calculated and adapted for focal lengths of photographic lenses and small refractors. Various other masks are actually designed for large telescopes with very large focal lengths, even if they have a small diameter
  • The mask fits and was tested with focal lengths from 100 mm to 600 mm
  • The same mask can be used with other lenses with the same filter diameter and comparable focal length
  • The mask is installed by putting into filter thread ring of the lens. This makes it very compact and it can be used without a sunshade. If a filter with the same diameter is screwed on, the mask will hold even then. A protective ring makes sure that the mask does not touch the lens surface
  • I always used such a mask myself, because I sometimes use a few photo lenses with the same filter thread size for astrophotography. This is the best solution I'm aware of
  • The mask comes in a storage box. The box can be labeled.

Please specify the filter thread size as marked on your lens.

If you need a custom text on the storage box, please send me this text of the inscription with a message after purchase. Please note that only one line is possible. One letter takes around 0.22 of the filter size, i.e 17 letters fit on a box for 77mm filter thread size. If you do not order a custom text, the size of the filter thread will be used.

Attention: the minimal supported focal length is 100mm. You can certainly use it with a shorter lens, but you will need large magnification on the display or an external monitor.

Please note that these masks can tilt and fall out at around 5˚ before the vertical position. Well, on so close to the horizon there are hardly any stars to see well... 😉

Please note that the material of the mask is heat-sensitive and starts deforming at 50˚C and hotter. Thus, the mask should be not left in the sun, for example.

If you have questions, feedback or suggestions for custom changes, please contact us using this form.


VAT exempted according to UStG §19
Delivery Time: ca. 3-4 workdays
Additional costs (e.g. for customs or taxes) may occur when shipping to non-EU countries.

The filter thread size is marked on the front side of the lens. For refractors, please measure the diameter of the front metal ring holding the front lens
Around 0.22 letters per mm of the filter thread size