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Nikon to 42mm adapter

Kat Lomas , May 25, 2006; 05:00 p.m.

I wonder if you can help me. I have used the same Praktica screw mount camera for almost 30 years. Unfortunately, the light meter and shutter have recently given up the ghost! I bought a Nikon FM10, used, without realising that the lens mount is bayonet. I now have 6 lenses with screw mounts and nothing to screw them onto. Is there a converting mount available or could one be made? A bayonet side that fits the camera body and a screw side for the lenses. I really can't afford to go out and buy a whole new range of lenses.

I enquired to S. K. Grimes about the possibility of obtaining an adapter to allow the use of screw mount lenses to a bayonet mount camera. The response I received was.... "Aside from modifying each lens to have a Nikon mount, the only option is a Nikon to 42mm adapter which will allow you to use the lenses on the camera, but will not preserve infinity focusing. These adapters can be purchased fairly inexpensively. I have used the search engine at B&H for 'Nikon to 42mm adapter' but got no results. Do you have any information on this item? Thanks.


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Dan Fromm , May 25, 2006; 06:16 p.m.

Tsk, tsk, tsk. Next time get a used M42 body or a new Bessa TM. Always look before you leap.

Jerry Litynski , May 25, 2006; 06:40 p.m.

Or look at the Pentax-type (used) bodies at


and see what is in your budget range. You might even be able to swap your Nikon FM10 towards a body that will use your lenses as is.

ian green , May 25, 2006; 06:46 p.m.

afaik there're two types of adapters
the cheap simple ones that cause infinity focusing problem
and rare pricy adapters with some kind of lens inside correcting the focusing problem
sorry i cannot provide no real data - just been browsing the forums and stumbled upon your question

Tommy Lee , May 26, 2006; 12:38 a.m.

Look at ebay. Jolo (Russian made)has a M42 to Nikon Adapter with corrective lens ($~50. Note: I never try one so don't know how the lens will effect quality. Photodiox (Chinese made) has an a version without lens ($13). Note: I wouldn't use this version unless you plan to shoot telephoto only. With the adapter, there is 2+ mm delta on flange to film. Not too small to ignor.

As other said, you can also get a M42 body for less then $50.

ian green , May 26, 2006; 07:59 a.m.

a little correction - Jolos adapters

Mark Wahlster , May 26, 2006; 03:21 p.m.

The Nikon lens mount has a registration distance (where the lens has to be from the film plane for proper focus registration) of 46.5mm the Pentax Practica 42mm screw mount has a registration distance of 45.46mm so your adapter would have to sink the lens into the body approx. 1mm to be able to achieve infinity focus. As this would not give any space for the adapter itself you would end up with even more extension there by causing the problem achieving infinity focus as the lens is being held to far away from the film plane to reach focus at infinity.

The suggestions of either selling your currently lenses (most likely for very very little) and buying proper Nikon lenses or just selling or trading the Nikon in for a working Screw mount body is your only option.

The adapters that include an optical element to correct the distance will negitively effect the quality of your photo's.

Bonsignore Ezio , May 30, 2006; 06:06 a.m.

I have the M42/Nikon adapter (model with lens), and it does not seem to affect the quality of the images and of course it preserve infinity focus. I'm using it to adapt a Flektogon 20mm and a Russian 500mm mirror tele on my F and F2. However it should also be understood that the adapter requires stop down metering. This is possible on the F/F2, but I'm not familiar with the FM10 and thus I'm not sure whether TTL metering would be possible at all. IMHO your best option is to look for a good used M42 camera in the Spotmatic/Konica range. Chances are that it would cost you little more than the adapter with lens.

Dan Fromm , May 30, 2006; 06:56 a.m.

Live and learn. I didn't know that Konica made M42 bodies, I thought Konica had its own bayonet mount.

Bonsignore Ezio , May 30, 2006; 03:56 p.m.

Ooops. Dan above is correct. Forgot once again that the proper procedure is #1) think, #2)open your big mouth.

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