Bahtinov sharpening mask Binorum 140-180 mm

Binorum 140-180 mm Bahtinov Focusing Mask

Precise focus is everything in astrophotography. The Binorum Bahtinov Focusing Mask is a practical plastic accessory that fits over the front of your telescope and uses a characteristic grid pattern to help you achieve sharp focus quickly and reliably - no more guesswork in the dark. This mask is designed for telescopes with an objective outer diameter of 140 mm to 180 mm.

How it works

The process is straightforward and easy to follow even when you are out in the field at night.

1. Place the mask over the front of your telescope.
2. Point the telescope at a bright star.
3. Switch your camera to live view mode and observe the star on the screen.
4. If the image is out of focus, the central diffraction spike produced by the Bahtinov grid will sit off-centre.
5. Slowly adjust the focuser until the central spike aligns perfectly with the two outer spikes.
6. When all three spikes meet at the same point, you have reached optimal focus for astrophotography.
7. Remove the mask and begin your exposure.

About Binorum

Binorum is a brand created by astronomers for astronomers. Every product is developed with a focus on practicality and quality - not as an optional extra, but as a tool that genuinely makes your time under the night sky easier and more productive. Binorum offers a wide range of astronomical accessories, so you can build a complete setup from a single brand with a consistent standard of quality throughout.

Specification