Possible to adapt M42 for Olympus OM-1 (film)?

Started 3 months ago | Discussions thread
Lightshow
Lightshow Veteran Member • Posts: 7,618
Re: Possible to adapt M42 for Olympus OM-1 (film)?
2

Albert Silver wrote:

I am looking into a variety of affordable film SLRs, and the Olympus came under my radar but I cannot seem to ascertain if one can adapt lenses from other mounts to it.

Right now my alternate is something like the Canon AE-1 (I did find adapters), though I am open to suggestions.

The links below list camera/lens mounts and their distance from the film plane to the mount flange (mount registration) and the throat diameter.

https://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html

The same data, but from the creator's site: https://stephen-westin.com/misc/mounts-by-register.html

And another list: https://en.m.wikipedia.org/wiki/Flange_focal_distance

Take the lens mount register distance and subtract the cameras mount register distance...

A negative number means the lens can't be mounted without loss of infinity or modifications to one or both mounts(eg. Mount conversion), or you will require corrective optics in the adapter.

If you have a positive number a simple adapter should be possible if there is enough distance between the two to permit some sort of adapter, plus, the lens mount diameter will also fit within the camera mount diameter (Z39[Zenit] will fit within M42, LTM will fit within M mount, but M mount can not fit within Samsung NX mount), so if the diameter of the lens mount can't fit within the camera mount then the register distance must be big enough to have enough clearance and still have infinity focus possible.

So in general, if you can't find an adapter, it may mean it's not possible to use that combination, that's when I will investigate their registration distances and if there is a possible issue that may explain why there is no adapter, it could also be because the mount is not common like Pentimatic (an adapter was recently made available) or that combination is uncommon like Nikon F to Konica AR.

M42: Registration = 45.46mm, Diameter = 42mm

OM: Registration= 46mm Diameter = 46mm

The camera register is greater than the lenses register by 0.64mm, the diameters seem fine.

Hope that helps you out

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