Rodagon literature doesn't say how it's used but does say that all
Rodagon enlarging lenses are equipped with pre-set aperture capability.
Chuck Norcutt
Michael Wong wrote:
> Gary,
> IC. Thanks, Gary :-)
>
>
> ---
> Michael
>
>
>
>
> 2009/4/15 Gary W. Marklund <gary@xxxxxxxxxxxx>
>
>> 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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