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Hi,

I'm hoping someone can help identifying this E. Leitz adapter ring. The base rotates with an alignment line on numbers 1 to 10. 1:3.5 is above the 1. It measures approx. 41mm across. any assistance is appreciated.

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 The VALAU for the 3.5 Elmar and the VOOLQ for the 2.5 Hektor were diaphragm adjusting rings that attached to the front of the lenses. They made changing aperature much easier, especially when these lenses were used in the darkroom.  The 1 to 10  marks were useful for enlargement work. In this photo, there are VALAU on the left, the ealiest had no company engraving or large block letters "LEITZ WETZLAR", later units had the condenser logo. In the center is the VOOLQ for the Hektor and is marked 2.5 in the same spot your ring has 3.5. Your ring is for the Elmar.  On the right are late issue in chrome finish, I have not see the 2.5 version in chrome.

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