Trouble with 'Adaptall -2 ' lens

pentaxpete

pentaxpete

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Peter
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I was given a CONTAX RTS II Quartz and a Yashica FR-1 then an Olympus OM10 that I gave away as I had an OM2n from my Son but with the OM10 was a TAMRON 'Adaptall -2 135mm f2.5 close-focus 18* BBAR MC with OM Mount so I KEPT the lens and put the 'Adaptall -2 CONTAX/YASHICA mount on it -- now I find it stops down OK when on the Yashica FR-1 BUT when on the Contax it will not stop down !! Any ideas from you Tamron experts ?
 
Yes -- i have tried f22 and f5.6 on the Contax and set shutter to 1 second then looked down into lens and aperture does not close down BUT doing same on Yashica it stops down OK .
 
Well, if it works on the FR 1 it should work on the RTS II, which suggests a problem with the RTS mount.

Is there any obvious difference between the two?

I've just checked mine and the stop down lever is at the bottom of the throat.
The other lever is the aperture indicator.
It moves freely and adjusts the shown f stop in the viewfinder.

I checked my RTS, RTS II, and FR 1.
 
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No 'Stop Down Pin' on the adapter as the Stop Down thing is inside camera lens mount but I DO try the stop down button on the RTS II and that is where i can see the lens is NOT stopping down.
 
Without the adapter mounted on the camera (RTS) when you press the camera stop down lever/button does the lever inside the camera move, this would actuate the corresponding lever in the lens when mounted on the camera. Without mounting the lens on teh camera body the adapter should have a lever that goes right through its body that actuates the corresponding lever in the lens, if it does then when you press the lever on the adapter do the blades move inside the lens (they probably will because it works on the other camera), if they do then the lens is fine, you may need to select different aperture values on the lens body to see this working.
Final check, not sure it is valid but without a lens mounted when you press the shutter button on the camera does the aperture actuating lever move? Not sure if that lever will move without a lens mounted, you may need to fool the camera that a lens is mounted, dont suppose you have any macro rings you can mount on the camera body to fool it?

Any pictures of lens mount, camera throat etc?

Matt
 
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