Just been given some Petri lens ......

Welcome Mike! I'm not familiar with Petri lenses but they seem to have an excellent reputation judging from that review. Hope you sort out the adapter. Looking forward to some Petri sample pics...  

 

Hi and welcome Mike

Cool! that's a brand you dont see too often and they're actually quite good. Their main competition was the Nikon SP and Canon P back in the 60's with Petri being just as good at a much cheaper premium (didn't stop them from going belly up though).

Try Fred Miranda or rangefinderforum, hopefully theyh'll have someone who shoots with it.

Happy hunting

 

Welcome Mike,
good to hear about Petri again.
Cheers,
Paul

 

welcome my friend...

 

Hello,

Petri made lenses in M42 screw-mount, but also in their own proprietary bayonet mount. Which one you have?

 

I don't know anything about the Petris, but the adapter you listed says, "Not for infinity" on the page. So this adapter is the wrong way. It looks like there are adapters that go from M42 to Petri, which is the correct adaptation, but won't help getting them mounted on your NEX.

Could be useful to check some Pentax forums - There might be a way to remove the rear bayonet mount leaving an M42 screw. Or other people more knowledgeable on what the mount type really is and how to convert/adapt it.

 

If you got a Petri bayonet lens, you will need an adapter like this:

PETRI BAYONET MOUNT to PENTAX M42 SCREW MOUNT METAL LENS AND ACCESSORY ADAPTER | eBay

to "convert" it to M42 screw mount. Then you would "plug" it to standard M42 adapter (there are plenty, I have one from Fotodiox that I'm happy with).

If you got a M42 version of lens, then all you need is a M42 to NEX adapter.

It easy to tell which is which - M42 is basically a big screw and bayonet has three large "teeths".

 

And what problems you are experiencing?

With the Petri bayonet adapter, the problem might be the pin that controls the aperture, that little metal tab that's sticking out. Does your aperture react to pressing it in? If I remember correctly, it should be pushed in and forced to stay that way prior to mounting the lens on the adapter. Some advised glue to keep it still, some sticking something around it for friction, some even to cut it off (but after that, or using glue, you can never use it again on film body or resell it as fully functional).

All this I say from memory when I was educating myself on M42 lenses before buying. I eventually decided to go only for older "manual" lenses (without that tab; the lens as yours is called "automatic" as the camera, by screw in the mount, controled the aperture). So I never head to deal with the problem actually, but others did and you can find more on the subject if you decide to follow.

For the second, I see no problem in theory. If you cannot screw the lens into adapter, try cleaning the threads on both lens and adapter (but off the camera, of course, to avoid dust falling inside the body). I had that problem with one of my Russian lenses that was dirty, but after thorough cleaning and careful bit-by-bit screwing everything went fine in the end.

Of course, I'm no expert - all of this is just guessing and thinking out loud.

 

And this is probaly THE place to get some help:

Index

 

Sorry, I see now that the diameter of the adapter opening seems to be wider than M42 screws. What adapter is it? Can you link to place you bought it from?

 

And there seems to be just one varation of Petri mount before they went M42; scroll down to Petri.

SLR Lens Mount Identification Guide