Abbe Koenig roof prisms VS Schmidt Pechan roof prisms | Optics Trade Debates

so what's Bak4 prisms?

so what's Bak4 prisms?

so what's Bak4 prisms?

The Nikon WX binoculars have Abbe König prisms so there are not only european binos with that prism

What were the names of the two other European Companies that make Abbe-Koenig Prism Binoculars? I already recognized Zeiss and Swarovski but I didn’t quite catch the name of the other two.

I went to DDoptics website but I cannot read German. Do you know about their warranty for US buyers?

One binocular in Bushnell's Forge line uses AK prisms. I suspect the prisms are not European in origin.