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Elmar 135mm


jankap

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I bought the head of an Elmar 135mm f/4. Also the ring 16472k, an OTZFO and the adapter 14167.

With my crop camera this gives a 200mm lens with the possibility of using my APO extender 2x.

 

This worked fine, I was on Safari with Benny Rebel. Except that the combination focusses beyond infinity.

The ring 16472k is about 1mm too thin (axial direction). The ring is of one piece of metal, no manipulating possible.

But the OTZFO shows on the lens side 2 screws. 

 

Does somebody know, what purpose these screws have? Is it possible, that herewith the OTZFO can be made thicker (axially)?

The other possibility would be to shim the combination. Does somebody know, how I can do that?

Thanks, Jan

 

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Personally I wouldn't be particularily concerned about lenses focusing slightly beyond the infinity stop, although it might be inconvenient for some grab shots, you still need to manually focus anyway. That said, I occasionally have made temporary very thin shims for some combinations, usually using heavy duty aluminum foil cut out with a hobby knife.

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Not quite sure but the OTZFO serves the 65 Elmar too in my memory. Could be the head of some 90 too

Yes (Elmarit 90 f 2,8) : having to serve different lensheads, no strange it has some tolerancing on infinity.... happens to other "multipurpose" accessories too (for example, my 280 lenshead on Televit goes a bit over infinity).

Edited by luigi bertolotti
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Welcome, dear visitor! As registered member you'd see an image here…

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spydrxx: "Personally I wouldn't be particularily concerned about lenses focusing slightly beyond the infinity stop"

 

Of course not, but one needs an anchor in life sometimes. :)

Like these hippos. At night feeding bio food (grass) and during the day digesting and bathing.

 

It is of great help if one knows, that at one end there is the fix point infinity. I´ll look, how I can shim the lens.

Jan

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