Farpoint Bahtinov Focus Mask — 77mm DSLR Lens

Focusing during BAD Seeing

Even at 10x I was getting soft inconstant focus especially with during bad seeing (Canon R6 UV-IR modified) w/400mm f/5.6 and a 70 - 200mm f/2.8 telephoto lenses with filters. With the Bahtinov screen, perfect focus every time.

Don't think it's working

I'm only giving it 2 stars in case I'm doing something wrong, but I'm not sure what. All the instructions from Farpoint, as well as all the examples I've seen everywhere else on the internet show a clear 6 point star pattern that helps with focusing. I don't see that with this mask. I basically see the same pattern as the mask itself, which gets smaller as focus improves, so it's absolutely no better than not using the mask at all. If I'm doing something wrong, it must not be a common problem because I haven't been able to find anyone else reporting similar issues.

Perfectly Convenient!

Upon placing my Bahtinov mask over the objective lens of my Televue 76, I found no need to find focus afterwards once I began imaging.