Michael,
On some Rodenstocks (all?) the button will also act as a lock so that
you can focus and compose wide open and then just rotate down to your
standard exposure aperture, e.g. f/11. The stop lets you do this without
having to count clicks or look at the aperture. The button should let
you reset this locked position. Sounds like the previous owner left it
set at f/16. Play with it and see.
Gary
Michael Wong wrote:
> Have got a Rodenstock Rodagon 80mm F4 enlarging lens from B&H. There is a
> release button, it makes aperture ring is free instead of stopped by half
> stop. What is the function for? Besides, I cannot rotate the aperture ring
> to the slowest speed --- F22. It'll stop at F16 position. Although I am
> seldom to apply F22 but wish to know why.
>
>
> Thanks all.
>
>
> ---
> Michael
>
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