Leitz Summarex 85mm f 1.5 m39 focus issues, need help

[Film Hunter]

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Hello all i having some problems with this lens : Leitz Summarex 85mm f 1.5 m39 with a k&f adapter to M mount will not reach to infinity.

I am missing something? 

And help will be welcome!

All the best and stay safe

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[Film Hunter]

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[wizard]

vor 28 Minuten schrieb Film Hunter:

Leitz Summarex 85mm f 1.5 m39 with a k&f adapter to M mount will not reach to infinity.

Does the lens reach infinity on an LTM camera? If so, your adapter may be out of tolerance. Else, your lens may need adjustment, but I suspect it is the adapter.

When you say "does not reach infinity", are you referring to the rangefinder patch or to the actual photographic result (images are not sharp at infinity)? In case it is just the rangefinder patch, have you tried to do some images? Perhaps they are sharp after all.

Edited April 24, 2023 by wizard

[Film Hunter]

Hello and thank you for helping me!

On my Leica iiif works perfectly fine, but on a Leica M9 and a Sony a7 iii will not reach to infinity.

So i think that adapter is not ok 

What i want to know , is there a special adapter for this lens? Or this one will work?

Thank you and all the best

 

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[romanus53]

The shown original Leica adapter should work fine. The K&F-Adapter you may have used to mount it on your M9 might look the same but seems to be different? I own a K&F adapter using Exakta lenses on Leica M and this adapter is a tiny little bit too long so I cannot reach infinity. Old LTM-lenses are calibrated for use on analogue film cameras and might show a different behaviour on digital bodies. Concering the mentioned ebay offering and perhaps custom and taxes it's expensive.

[luigi bertolotti]

The critical details in 3rd party adapters are two (apart the possible cutout, which is not so significant for the Summarex) :

1) Thickness, that must be EXACTLY 1 mm (this is simply  a question of manufacturing tolerancies)

2) (even more important) ; the thread initial point : if not correctly positioned, it can cause a not perfect positioning of the lens towards the body's rangefinder cam, bringing to uncorrect aligning of the rangefinder path inside the RF window ; in my opinion this is probably the origin of your issue : find an original Leitz one : so better if it is of the kind without cutout, so that it covers the LED strip for lens' recognition... in case, you can even code your lens as a 90mm, to activate the correct viewfinder mask -  there are even 3rd party ones (Voigtlander, typically) with the engraved "dots" ready for coding with black & white enamel

 

Edited April 25, 2023 by luigi bertolotti