Improved Sensitivity Tri-Bahtinov Mask

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Improved Sensitivity Tri-Bahtinov Mask

Focusing and Collimation Tool

The Skylabs Improved Sensitivity Tri-Bahtinov masks are designed to obtain a very accurate focus and very precise collimation of reflector telescopes, including Schmidt-Cassegrain, Maksutov-Cassegrain, Classical Cassegrain, Ritchey-Chretien, Maksutov-Newtonian, and Newtonian Telescopes.

The Tri-Bahtinov mask improved by C.Y. Tan and Satoru Takagi has incorporated several enhancements compared to the traditional Bahtinov mask. It allows to evaluate an even more accurate focus and it also allows to detect and correct a misscollimation of a reflector telescope.

This affordable tool is the result of vibrant cooperation and open-source contributions inside the astrophotography community.

While the traditional Bahtinov masks deliver a diffraction pattern, creating a set of three fine spike lines around a bright star, the Tri-Bahtinov masks generate a set of 18 spikes, which is crucial to assess an accurate focus in astrophotography.

The Skylabs Improved Sensitivity Tri-Bahtinov mask is based on eco-friendly high density cardboard (kraftboard). The material is not only durable but also delicate with the telescope optics, especially for MCT, MNT, and SCT. The thin material and the CNC precision cut shape ensures an extraordinary precise diffraction pattern.

How to order

Each Skylabs Improved Sensitivity Tri-Bahtinov is created on-demand as it depends on each telescope caracteristics. In order to requests one of this masks, you will need to provide the following accurate values in millimeters:

  • Telescope brand and model.
  • Focal Length.
  • Secondary Holder Diameter: is the diameter of the secondary holder.
  • Secondary Diameter: is the diameter of the secondary mirror.
  • Aperture Diameter: is the diameter of the main mirror.
  • Inner Tube Diameter: is the diameter of the inside wall of the telescope tube.

Size Compatibility

We recommend this type of mask for telescopes over 140mm of aperture. If you have a smaller telescope, consider using the Skylabs Enhanced Bahtinov masks, which has been designed for camera lenses and small telescopes, and it is several times brighter than traditional ones.

Learn more about Skylabs Enhanced Bahtinov masks

Currently, Skylabs can not provide Tri-Bahtinov masks for telescopes with an outer diameter bigger than 300mm.

Each order includes:

  • Tri-Bahtinov Mask
  • Tri-Bahtinov Mask Cover (for collimation)
  • Quick Guide

Telescope, camera or other elements shown in the pictures are not included.

How to use the Skylabs Improved Sensitivity Tri-Bahtinov Mask

Download Quick Guide