pentacon 2.8/135 aperture problem

[madtigerhide]

Hello

i just go a pentacon 2.8/135mm with a m42 mount. it is the manual focusing version with serial 8406xxx.

the problem is that it is supposed to have a minimum aperture of f32 but it only turns to point to f22. there is also a red dot on the f22.

does this mean that they had "extra" aperture rings marked up to f32 and decided to use it on a lens with a minimum of f22 or something is wrong with the lens?

thanks for your help in advance.

[peterqd]

This is a preset lens, although it doesn't look like it. This makes it easier to set the aperture without taking the camera away from
your eye. To preset the aperture you have to pull the aperture grip ring towards the front of the lens, turn it and let it click back to the
new position and then the dial will only close the aperture as far as your setting. If you pull out the grip and turn it clockwise (viewed
from the front of the lens) to the limit, you have preset the aperture to f32. If you're using it with an auto-exposure camera you can
leave it on f32 and just stop down using the dial.

Hope this helps. Many people ask this question!

[madtigerhide]

thanks so much for the reply. is there a video of this procedure anywhere please? .. i'm obviously new to manual lenses. what about the fact that it stop at f22 and there is a red dot over it instead of sliding to f32?

[Lloydy]

There's some instructions, and links to youtube videos, here. The second video is the more useful one.

http://www.pentaconsix.com/preset.htm


It's very confusing when you get your first pre set lens, and very difficult to describe to someone how to use them. But once mastered they are easy, and in some instances faster, to use than normal lenses.

[peterqd]

[peterqd]

[madtigerhide]

thanks so much for the prompt help guys.. really appreciate it