Fotodiox x Novoflex x Voigtlander: M-mount adapter cagematch

Started Nov 19, 2013 | Discussions thread
Letsgokoulos Senior Member • Posts: 2,168
Re: Fotodiox x Novoflex x Voigtlander: M-mount adapter cagematch

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.


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