masks in Malta

Received an email from near the Mediterranean Sea.

Good afternoon,

I read some of your blog posts on using focusing masks for DSLR focusing and would like to ask you what is your final experiment result on the best type and size of mask to use please?

Best wishes,
Alexei
Malta

Shared that it was still a work in progress! I was still experimenting with bar thickness. But in general I thought the Y-mask type best for camera lenses and small telescopes in terms of light transmission.