My monster "pentaconar" 500mm (made before the order came through that Meyer should use Practicar as the new name), has a threaded ring holding the rear element and measuring (without my glasses on) the nonius scale gave 49,35mm.
p.
My monster "pentaconar" 500mm (made before the order came through that Meyer should use Practicar as the new name), has a threaded ring holding the rear element and measuring (without my glasses on) the nonius scale gave 49,35mm.
p.