birdbrain8
New member
The 50mm objectives of a vintage 7x50 binocular were replaced with 90mm objectives. This resulted in an 18x90 binocular with a 5mm exit pupil and a 2.8degree Tfov.
For how to see:
http://www.scribd.com/doc/10315218/Binocular-Rebuild-2
For how to see:
http://www.scribd.com/doc/10315218/Binocular-Rebuild-2