Bahtinov Focusing Mask TS Optics 125-180 mm

TS Optics Bahtinov Focusing Mask 125-180 mm

Every astrophotographer knows the feeling: the stars in the image are not sharp, and hours of work at night are wasted. A Bahtinov mask is a simple but remarkably effective tool that solves this problem quickly and reliably. The plastic mask fits over the front of your telescope and gives you instant visual feedback on focusing accuracy - no expensive equipment, no complicated setup. The TS Optics Bahtinov focusing mask is designed for telescopes with an objective outer diameter of 125 mm to 180 mm.

How does a Bahtinov mask work?

The mask is named after its inventor, Pavel Bahtinov, who found an elegant solution to one of the oldest problems in visual astronomy - how to know reliably that your image is truly in focus. The mask's grid produces a distinctive diffraction pattern: three lines passing through the centre of the star image. When the central line sits exactly between the two outer lines, focus is perfect. If the central line shifts left or right, simply turn the focuser until all three lines meet at a single point. This method works reliably even in difficult conditions, and even less experienced observers will find it straightforward.

Quick and safe installation

Fitting the mask takes under a minute. Each mask comes with three screws. Remove the plastic caps from the screws, pass the screws through the corresponding holes in the mask, and replace the caps. This holds the mask securely on the telescope tube with no risk of damage to the optical surfaces.

Step-by-step focusing guide

1. Fit the mask over the front of the telescope.
2. Point the telescope at a bright star.
3. Activate the live view function on your camera.
4. Watch the diffraction pattern on the display.
5. Turn the focuser until the central line sits exactly between the two outer lines.
6. Remove the mask and begin your exposure.

Precise focusing for astrophotography now takes just a few seconds. Once the central line is in position, remove the mask and start shooting.

Technical specifications

Who is this mask for?

This focusing mask is a small accessory that pays for itself on every imaging session. It suits beginners who want reliable focus quickly, and experienced astrophotographers who want a consistent, repeatable method. A simple solution for sharp results - without compromise.