[jerry3672 (Jerry Hailey)]

Originally Posted by Dennis

Hi Dave



So far, my testing has led me to believe that I can use one mask per OTA either at prime focus, barlowed or with a reducer/corrector. Also, $82.50 doesn’t sound too exorbitant for such a crucial task as focusing, which we may perform several times per session over the life of the OTA. Worth every penny!

Cheers

Dennis

Dennis, my testing has the same results that you see. One mask per OTA.

What currency is the $82.50?

I used 3003 Aluminum because it less likely to crack over time. Also cutting on a water jet will not over heat the base material like a laser. I was afraid that the small cuts for the 80mm scope would end up breaking if we didn't use a high grade of aluminum. A good quality Bahtinov mask will last more than the life of your OTA.