What's this on my Vivitar 135mm?

abdoujaparov

abdoujaparov

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I've been given a Vivitar 135mm f2.5 in screw-mount (Tokina-made I think).

Can anyone tell me what this thing on the left is? The silver bit pushes down, but it doesn't move anywhere despite the arrows. It's not the M/A switch, that's elsewhere.

vivitar.jpg
 
DoF - to stop the lens down - auto or locked I think. You can either stop the lens down or leave it on auto so that the camera closes it down when you take a pic.
 
simon ess said:
Is it long exposure, like on Bronica lenses?
Click to expand...

Hmm. I think that would only work with a leaf shutter in the lens, wouldn't it?

kendo1 said:
DoF - to stop the lens down - auto or locked I think. You can either stop the lens down or leave it on auto so that the camera closes it down when you take a pic.
Click to expand...

Sorry, that was the M/A switch I mentioned in my post, I wasn't very clear. This is something else, I think.
 
It's part of the Vivitar T4 or TX mount system which adapts the lens to different bodies... it's the adaptor lock (L) and release (O). With the silver part depressed the whole collar should be able to rotate between the two positions.

I believe it's a TX w/ an SMC M42 adaptor
 
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sk66 said:
It's part of the Vivitar T4 or TX mount system which adapts the lens to different bodies... it's the adaptor lock (L) and release (O). With the silver part depressed the whole collar should be able to rotate between the two positions.

I believe it's a TX w/ an SMC M42 adaptor
Click to expand...

Oh, interesting, thanks!
 
It might have been indexed wrong when the adaptor was mounted. According to the link, it should be indexed to the orange triangle when initially mounted. BTW, the P/ES on the adaptor means it supports Pentax ElectroSpot metering on those early cameras, and the M42 adaptor was for early Pentax screw mount bodies (and others).
 
sk66 said:
It might have been indexed wrong when the adaptor was mounted. According to the link, it should be indexed to the orange triangle when initially mounted. BTW, the P/ES on the adaptor means it supports Pentax ElectroSpot metering on those early cameras, and the M42 adaptor was for early Pentax screw mount bodies (and others).
Click to expand...

Brilliant, that sorted it
 
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