Farpoint FP402 Bahtinov Focus Mask for Telescopes with Dew Shield or Tube Diameter from 5.5" to 8.5"

This mask works very well and I actually somewhat prefer a plastic one over metal as others have complained the metal counterparts can have very tiny metal shavings come off. This mask ships in shrink wrap. In my case, the shrink wrap had warped the mask quite a bit by the time I received it. When I removed it from the shrink wrap, I gently tried to bend the mask back into shape and then, SNAP! It broke in two places. The plastic is quite thin, so DO NOT try bending it! I called Farpoint however and they shipped me a new replacement mask for free. I am quite pleased with their customer service!

It's amazing how someone could come up with such a thing, but Bahtinov did it and it works. This is a very cool invention that makes your stars perfectly crisp.

Not sure how I focused my AT6RC without this. This is the best accessory I purchased for astrophotography. It is a must have.

best thing ever for focusing on bright stars

Crazy but it works

Actually no stars, it's flimsy and poorly made, the set screws don't function properly...The Bahtinov design originated from Russia, at best this is a poor copy...After looking at different types there are better mask for the money, Astrozap or the Gosky Bahtinov hands down!

Prompt delivery! Just had the opportunity to use it for one session ,so still getting familiar with the image. Worked as expected giving a fine-tuned focus.