Nothing I know of, but then again the only M42 lens I'm likely to use on 
a digital camera is the SMCT 135 f2.5 which covers the contacts nicely.

Shel Belinkoff wrote:

>In another thread JCO and Adam are going at it about how easy/difficult it
>may be to focus the DSLR's with an M42 lens stopped down.  I decided to see
>for myself how hard it would be to focus (it's not at all difficult).  In
>so doing I could see that the various contacts on the lens mount were
>exposed.  Is there some way to cover those contacts while using a screw
>mount lens?  Any suggestions?
>
>BTW, it seems easier to use a screw mount lens on the ist-Series camera
>than a K mount.  At least in the limited circumstances that I've tried thus
>far.
>
>
>Shel
>
>
>
>
>  
>


-- 
Things should be made as simple as possible -- but no simpler.

                        --Albert Einstein



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