I understand that Leica Ultravid and Swarovski EL use Schmidt-Pechan lenses but that Zeiss FL is brighter because it uses Abbe-Koenig lenses.
Question, if Abbe-Koenig is so clearly superior, why doesn't every Alpha bino maker use Abbe-Koenig design?
Abbe-Koenig prisms system will increase the size and weight of binoculars. Now I think vacuum coating techniques can resolve the weakness of Schmidt-Pechan prisms system.
Such as FBMC, phase corrected, super high reflection dielectirc coating, etc.
Hello Etc,
The 32 mm. models of the FL line do use Schmidt-Pechan prisms. I believe that the use of A-K prisms still have a slight edge in light transmission.
Happy bird watching,
Arthur