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Exakta to M42 adapter question

Simon T (Ireland) , Oct 14, 2007; 04:03 a.m.

Hi, Can someone tell me please if focus to infinity is possible with a Kine Exakta lens on to an M42 screw mount adapter. I intend to but one of these adapter to use a Topcon RE lens on a Praktica MTL3 M42 body.

http://cgi.ebay.ie/KINE-EXAKTA-LENS-to-M42-Pentax-mount-adapter- RARE_W0QQitemZ170158113404QQihZ007QQcategoryZ4702QQssPageNameZWDVWQQrdZ1QQcmdZVi ewItem

Thanks, Simon


richard oleson , Oct 14, 2007; 10:51 a.m.

According to a list i just looked up, the exakta bayonet register is about 1mm shallower than the M42. if this is correct, then infinity focus would be impossible.

I have never used or seen an exakta/M42 adapter, so I can't offer anything from experience.

richard oleson , Oct 14, 2007; 10:55 a.m.

Actually, I take that back: I do have a little personal experience. I have an old Meyer lens that appears to have been factory (or repairman) converted from Exakta to M42 mount back in the 40s. They did machine a little bit off of the lens to correct the register, then attached an M42 ring over the bayonet with screws. It's still possible to remove the ring and mount the lens on an Exakta, but it wobbles a little bit.

Paul Shinkawa , Oct 15, 2007; 10:42 a.m.

But the standard over-the-counter Exakta mount to M42 didn't allow for infinity focusing. It was just a means to use M42 lenses on a bellows or extension tubes for close-ups.

Seymour's Exakta (a store in New York City) sold a replacement M42 flange mount for Exakta's back in the mid to late 60's. It claimed to allow infinity focusing with only manual aperture control. I have never seen one of those mounts or a camera adpated to one one-Bay. Anybody remember those?


richard oleson , Oct 16, 2007; 11:39 p.m.

I haven't seen those, but there were some Exaktas (or maybe Exas) made in M42 mount. The register is not far off, and the Exakta bayonet flange has some depth to it, so it could well have been possible to fit an M42 flange in its place and get to infinity.

pablo cravioto , Oct 29, 2007; 01:12 a.m.

there is a russian ring m39 to m42 i put this into the exakta mount lens and fit ok in my biotar my kine exakta model4 with a zenit mount in there convert this to m42 focus both ok best regards from mexico

pablo cravioto , Oct 29, 2007; 01:18 a.m.

sorry the zenit mount in the exakta fit without the exa mount reverse the zenit mount and two screws fit in zenit exakta mount bye bye amigos

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