Possibly find that the lenses are 'doublet' as dual spehrical grinding of lenses (both sides curved) is a fairly modern thing. The old way is a pair of flat pieces of optical glass, ground on one...
Type: Posts; User: No.3
Possibly find that the lenses are 'doublet' as dual spehrical grinding of lenses (both sides curved) is a fairly modern thing. The old way is a pair of flat pieces of optical glass, ground on one...