Binorum Bahtinov Focusing Mask 120-160 mm
Precise focus is everything in astrophotography. Even the smallest deviation shows up in every single frame. The Bahtinov focusing mask solves this problem simply and reliably. The plastic mask fits over the front of your telescope - covering apertures from 120 to 160 mm - and produces a characteristic diffraction pattern that lets you achieve focus with an accuracy impossible to reach by eye alone.
How to use the Bahtinov mask
The process is straightforward and anyone working with a camera on a telescope can do it.
- Place the mask over the front of your telescope.
- Point the telescope at a bright star.
- Switch on your camera and observe the star on the screen using live view.
- If the focus is off, the central spike of the Bahtinov grid appears shifted away from the other two spikes.
- Adjust the focuser until the central spike sits exactly between the other two. At that point, focus is optimal.
- Remove the mask and begin exposing your target object.
About Binorum
Binorum is a brand created by astronomers for astronomers. The philosophy behind the brand is built on quality construction and practical usability - every product comes from the real needs of observers and astrophotographers. Binorum offers a wide range of astronomy accessories, from masks and filters to eyepiece accessories, and has built a lasting reputation as a reliable partner for those who take the night sky seriously.
Technical specifications
| Parameter |
Value |
| Compatible aperture |
120-160 mm |
| Material |
Plastic |
| Fitting method |
Slides over the front of the telescope tube |
| Pattern type |
Bahtinov diffraction grid |
| Intended use |
Astrophotography focusing |
| Brand |
Binorum |
Why choose a Bahtinov mask?
Perfect focus, every time
The diffraction pattern makes it immediately obvious when focus is correct. There is no guesswork involved.
Simple to use
The mask works with any camera that supports live view. No additional software or equipment is needed.
Built for real use
Binorum designs its accessories based on actual field experience. The Bahtinov mask fits securely and is quick to attach and remove, even in the dark.
Compatible with a wide range of telescopes
The 120-160 mm aperture range covers many popular telescope models used in astrophotography.
