I have a Saxon bino viewer with a internal threaded nose piece.
I bought a Bintel 2x Barlow to bring eyepieces into focus, the Barlow has a threaded optical cell that can be removed from the Barlow body and screwed into the bino nose.
Two questions for help please;
1. how do I calculate the magnification when the total Barlow is used as just a 2x Barlow with the bino inserted into the Barlow ( does bino length come into play?).
2. With the Barlow lens cell screwed into the bino nose piece how do I calculate the magnification.
Thanks in advance,
Norm.
