A t-mount lens has the same thread diameter but a different thread pitch as
the pentax screw mount lenses. Vivitar made many lenses in the t-mount.
Eric
>From: "Conrad Samuels" <[EMAIL PROTECTED]>
>
>Yet another question please. I promise not to speak again for a while..
>
>Amongst my various screw mount Pentax lenses is a Vivitar 28mm f2.8 lens
>which at first sight looks like a Pentax screw mount. Yet when you screw
>it
>in it stops about 20 degrees short. In other words the diaphragm
>activating
>pin stops about 4 o'clock on the camera flange so that it cannot be stopped
>down by the camera stop down mechanism.
>
>Now I've looked at it from every angle I can, even dismantled it but there
>is just no way one can adjust or re-set the thread. Does anyone on this
>list know whether there is a similar thread which almost but not quite
>matches the M42 thread?
>
>
>Conrad F. Samuels
>Kirstenhof RSA
>
>
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