If you can see where it falls between the two numbers you can set the same ration on the lens.

Quote Originally Posted by Pioneer View Post
I have the Ansco Speedex Special R, which is the US version of the Agfa Isolette III
So do I. It was a gift from a member of this forum a few years ago. It seemed that he liked to buy them, repair and refurbish them, then give them away. Mine looks and works like new.