Fotodiox x Novoflex x Voigtlander: M-mount adapter cagematch

Started Nov 19, 2013 | Discussions thread
Letsgokoulos Senior Member • Posts: 2,204
Re: Fotodiox x Novoflex x Voigtlander: M-mount adapter cagematch

turnstyle wrote:

Letsgokoulos wrote:

PaulR wrote:

How did you shim the adapter?

If you want an accurate hard stop on infinity, the only solution is shimming the adaptor. I have made the choice of cheaper adaptors so I could purchase one per lens and then shim it accurately. Since it is dedicated to a specific lens, it never is dissassembled and therefore does not deteriorate.


I remove the steel plate of the adaptor on the lens side (usually 3 or 4 screws), then place little strips of adhesive tin/aluminum foil evenly around inside the adaptor, around the screw holes. I then reassemble the top, and check the infinity setting. If it still is not accurate, I repeat the operation. I usually have to place 2 or 3 layers of foil to get an accurate infinity setting, this is a trial and error procedure.

The Focus Assist magnification helps finding the infinity point easily, the time consuming part is the number of iterations you need to get the number of layers of foil right.

For what it's worth: short lenses have a shallow depth of focus so the shim has a larger affect on the focus scale. If shimmed accurately with a short lens it should be equally accurate with a longer lens.

I just found back a link to a more graphical explanation of the procedure.


Just double-checking -- you remove the lens side? I had thought it was body side (and, as best as I can see in the link, it looks like the body side there).

Anyhow, these manufactures should just include a few shims.

fwiw, when I tried to shim, it turned out my tiniest glasses Phillips head screwdriver was still too big. I'd rather just have an adapter that reaches infinity out-of-the-box (and plenty of people seem to have them).

Yes, it is the lens side. There usually is no plate to remove on the mount/body side.

No manufacturer offers a shimming possibility, except for the helicoid types of adapters. But the prices are not the same as standard adaptors.

The tools to use for photography hardware just are not regular tools. The phillips screwdriver do not have the correct angle, so you ought to use JIS screwdriver types (see

If you think that it is possible to have an adaptor "that reaches inifinty out-of-the-box", I do not see why you should hesitate to purchase one. I am only advising based on my personal experience. If I had found adaptors that do not require either a shim or focus setting, I certainly would have purchased them...

With regards to the lack of accuracy of "ow cost chinese" adaptors, most of the manufacturers are equipped with either high-level accuracy lathes or CNC, so there is no reason why they should not be as accurate as the top-notch companies. The quality of materials used being, of course, a totally different matter.


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