Here's an early Weihrauch diopter and Falke diopter from the early-mid 1950's. Both are steel, hand machined/fit with assembly numbers, the Weihrauch with an old fashioned oversized aperture disk, the Falke with a cute little adjustable iris feature. The Falke has a mechanism to lock the diopter from sliding on the dovetail, the Weihrauch using the less elegant arrestor hole screw! Someone is copying someone? 
Other Interesting diopters...
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"The Falke has a mechanism to lock the diopter from sliding on the dovetail, the Weihrauch using the less elegant arrestor hole screw! Someone is copying someone?"
Isn't the Weirauch the one with the dovetail lock? Turn the screw with a tommy bar?
Isn't the Weirauch the one with the dovetail lock? Turn the screw with a tommy bar?
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Both these heavy steel diopters lock on the dovetail, the Weihrauch using the arrestor hole screw, the Falke engaging slots on the dovetail.
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Those are lovely! Thanks much for posting.
I have several of the old HW diopters - which must have been made in small batches as there are many variations - but not a Falke one. I'd never realized the position lock worked like that.
I have several of the old HW diopters - which must have been made in small batches as there are many variations - but not a Falke one. I'd never realized the position lock worked like that.
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