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VOOLA aperture adjustment ring for the Elmar 50mm f3.5. Later product code: 16621. Introduced in 1955, this is a classic accessory for Elmar users.
This handy ring allows you to adjust the aperture while keeping a FISON lens hood or an A36 slip-on filter, such as the FIOLA, attached to the lens.
To install the VOOLA, position it so that the Elmar's aperture lever fits between the two prongs of the ring. When using a FISON hood or slip-on filter, simply loosen the securing screw slightly and rotate the hood or filter together with the VOOLA to adjust the aperture.
There are some signs of wear from use, but no noticeable scratches or deformation. Overall, it is in very nice condition.
The ring has been tested for proper fit and operation with a FISON hood and an Elmar 50mm f3.5 lens.
The price includes domestic shipping within Japan.