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.
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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.
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