Michael M.
12-Nov-2003, 07:12
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.
http://www.hibrno.cz/files/ApoRonar06n4.gif
Can anybody explain what are they useful for?
Thanks, Michael
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.
http://www.hibrno.cz/files/ApoRonar06n4.gif
Can anybody explain what are they useful for?
Thanks, Michael