Bahtinov Mask Focusing Mask for Telescopes (for Outer Diameter from 125mm-180mm)

It is flimsy but you shouldn't be bending it. The size is what it says it is. Don't make the mistake of thinking it is for your telescopes diameter where it takes in light. Make sure you get a size a little bit bigger and smaller then your telescope

I had to return the Batinof mask since it arrived cracked. After careful inspection I don't think this item would last very long. The shipping box was not damaged but the mask was cracked. Seems pretty flimsy.

I received my first one and the screws were missing. Got sent another one and yep, the screws were missing. Time to look elsewhere.

Did not come with mountain hardware like pictured and described in the description.

well made mask

No screws!!!!

The mask arrived today and it appeared to be sturdy and well constructed. The edges were sharp, which provides good contrast for a sharp focus. The holding bolts were brass with a plastic coating to protect the telescope finish. The only problem I had was that one of the bolts was stripped and did not hold securely to the telescope. The bolt is inexpensive and fairly easily replaced, but I will have to do that. With that minor correction I would easily rate this as five stars.Update: ALL of the holding bolts were defective. They were not stripped, they were the wrong size for their nuts, and I've had to replace all of them. Other than that, it has been an indispensable aid for getting a precise focus for astrophotography.