Hi all,
I've finally bought an APO Ronar 300/9 I wrote about recently. It looks O.K., with respect to it's 20 yrs. age, seems to have single layer coating, simply - I think I will love it.
What I don't know are two things: there is another (red) scale from 2 to 30 mm on the opposite side of the aperture ring, and a lever just above the ring (it can move about 100 degree or so, but seems to rotate with nothing inside). See both below.
Can anybody explain what are they useful for?
Thanks, Michael
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