Hello,
I am using a Pentax K2000 and I just acquired a Rikenon P-zoom 1:4-5:4 28-135mm MACRO lens from my father. The filter attachment is dented, so I can't screw any filters on, but the lens seems to work fine in manual mode. I'd like to learn more about this lens and am hoping that I can find some good information here.
So far all I know is from Robertstech:
Quote: Incompatibility Warnings:Avoid Ricoh P-series ("Program") lenses.
You can identify these lenses by a "P" or "(A)P" setting on the aperture ring similar to the A on the A-series Pentax. When the ring is rotated into the "P" (Program) position, it locks in place and you have to depress a small button to get the aperture ring to move again. These lenses have a small ball bearing contact on the rear flange of the lens that will pop right into the hole that holds the AF cam on Pentax autofocus bodies. The result will be that the lens gets locked tight on the body, only halfway mounted.
Early, non-P-Series Ricoh lenses should cause no problem because they have no extra electrical or mechanical contacts.
I didn't have this information before I tried the lens on, but it doesn't seem to experience any of these issues. The lens is easily removable.
What does the p mode on the aperture ring do? (It locks and has a release button).
It performs very well and the macro works nicely, too. The front glass is a little messy, as you can see. What steps should I take to clean it up?
I'm also curious about the value of the lens.
Thanks!
(I took the picture with my Sony cybershot, and I think it focused on the inside of the lens and not the front. Sorry that it isn't a sharper image).
Last edited by dragonfly; 09-04-2009 at 10:36 PM.