caila77
Well-known
I've a lens exactly like the one you can see here
the lens has an adapter ring at the base that allows it to be mounted on cameras with an M42 bayonet. The only problem I encounter is that there is no mechanism that closes the diaphragm to the set value nor is there any mechanism on the back of the lens. I can imagine it being a special purpose lens.
Tele Imperial 4,5 / 200 mm Prime Objektiv Tele Lens M42 Mount n15b | eBay
Blenden defekt. Anschluss /Mount : M42.
www.ebay.de
the lens has an adapter ring at the base that allows it to be mounted on cameras with an M42 bayonet. The only problem I encounter is that there is no mechanism that closes the diaphragm to the set value nor is there any mechanism on the back of the lens. I can imagine it being a special purpose lens.
petronius
Veteran
The shown lens has a ring marked O-C above the aperture ring which closes the aperture to the value you set on the aperture ring.
caila77
Well-known
No, it does not work …. Maybe it is broker?
mdarnton
Well-known
The description says "blades not working" so yes, as described it is broken.
caila77
Well-known
I’ve a Lens like the one in the link, not the one in the link
Cascadilla
Well-known
This looks like an old pre set T mount lens--you manually stop down the lens just prior to taking the picture. The T mounts could be changed to a variety of camera mounts and since there was no diaphragm automation these could function on many different cameras. When I used SLRs with stop down metering, I would focus and compose and then take a meter reading and click the shutter. After taking the picture, I would then open the diaphragm to set up for the next one. Since these lenses were mechanically much simpler than auto diaphragm models they were correspondingly cheaper.
petronius
Veteran
I have some similar lenses in which the front tube can be unscrewed to have a closer look at the O - C mechanism.