Hi, everyone.
I recently acquired a Rodenstock 480mm APO Ronar f/9 barrel lens. I noticed tha t if you turn the aperture past nine, it keeps on getting larger (noticably) bef ore the petals are out of the line of view through the lens, maybe f/8?
So, I guess my question is, what does this mean on a lens? If you go into this aperture area, are you actually getting more speed, or am I just a very wishful, somewhat slow, thinker...
Thanks, Pete.
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