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R to M adapter


Infantasy
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When using R lenses on a M camera you need an electronic viewfinder or the LCD at the back for focusing.

This is not possible with the M9. You probably need to upgrade to a M240 or M246, or a SL

If you have a lot of practice and are good at estimating distances, you can also try to set the distance on the distance scale of the lens. This can be ok for wide-angles. But it will probably not work for a 90mm lens with its small depth of field.

 

If you do not want to upgrade the camera, then you should sell the R lens and buy an equivalent M lens instead.

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If you look into the lens mount of the M9 with the lens removed, you will see at the top a roller.

The roller is pushed in and out by a cam on the rear of a rangefinder specific lens as focus ring is turned.

This is a precision calibrated mechanical action which moves a mirror in the cameras rangefinder mechanism.

SLR lenses don't have this cam so there is nothing to move M9 rangefinder mechanism.

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The M9 can only focus with the rangefinder, so you need a rangefinder-coupled lens. That means a Leica M lens, a Leica screw-mount lens, a Zeiss ZM lens or a Voigtländer lens.

All adapted lenses can only be focused via EVF or LCD, so only with M240, M246, SL.  (Also not with M262, because it has no life-view).

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The old lenses you probably heard about are probably screw mount lenses, for an earlier version of the Leica bodies. Yes, they mount and focus just fine (& to infinity) with the proper mount.  I use Leica, Canon & Tanack ones just fine on my screw mount & M bodies. Where caution should prevail is with some of the FSU (former Soviet Union) lenses, typically manufactured after appropriations settlements after WWII...many can be adjusted by a qualified technician to work perfectly well, but there were some very minor differences in manufacture which may make some unsuitable without some work being done on them.

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  • 2 weeks later...

Have a new question on this topic. Was doing a lens comparison between my Summicron M 35mm v4 and an ancient Summicron R 35mm with R to M adapter on my M246. I noticed isn't a 1:1 image comparison as the R image was magnified. So, does the r to m also have some extender qualities? Anyone have any data on this?

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The marked focal lengths on lenses is often not exactly their true focal length. However, the difference you're suggesting seems more than normal. I'll check FoV between my Summcron-R 35 and Summilux 35 v2 when I get home ... I can do it on both SL and M bodies.

Either the Summicron R is longer than expected or the M lens is wider than it ought to be.

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Hello Billinghambaglady,

 

A few more questions, if you don't mind:

 

What is the filter size of your lens?

 

Is the lens hood built in or do you have to put it on?

 

Best Regards,

 

Michael

Edited. Rechecked and the hood is not changing the image. It is removable. The filter size, don't know. This lens is probably first version. Serial 243xxxx Edited by billinghambaglady
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