#188. Leica-M or Leica-R: which Red Dot for your Sony A7r ?

By pascaljappy | Opinion

Dec 19
[Note : Access the complete summary of our review of the Sony A7r system (camera review, native lenses, alternative lenses, opinions … )]

The lure of mounting a tiny & fantastic Leica-M lens on a (reasonably) tiny & (unreasonably) fantastic Sony A7r is one of the major reasons so many people took the plunge … only to be disappointed by the complexity of the lens compatibility issues on this sensor.

Polar Bear - Sony A7r. The FE 35mm is a superb lens, but legacy glass is also worth looking into

Polar Bear – Sony A7r. The FE 35mm is a superb lens, but legacy glass is also worth looking into

Count me among the grumpy as co-author Philippe’s Elmar 24mm f/3.8 was right up there in my shopping list for hiking purposes, yet doesn’t live up to its M240 or NEX-7 promise on Sony’s new mirrorless flagship.


But there are two good reasons not to despair :

  1. Many M-mount lenses work perfectly well on the Sony A7r
  2. Leica-R lenses are superb in their own right and far cheaper
A ruin in Saint Maximin, France - Sony A7r & Leica Elmarit-R 90mm

A ruin I’d love to convert – Sony A7r & Leica Elmarit-R 90mm

Great M-mount lenses for your Sony A7r

A tricky question that, as reports vary greatly – for identical configurations – on forums and review websites. Individual users have different photographic styles, display varying tolerance levels and use different adapters, rendering any statistical analysis totally pointless. I can’t recommend a list, sorry.

That said, you’ll find some interesting reports in the links below :

Sainte Baume fall colours - Sony A7r & Leica Elmarit-M 90mm

Sainte Baume fall colours – Sony A7r & Leica Elmarit-M 90mm

But beyond this, I think a few guidelines for your personal evaluation are more important than other people’s point of views.

First of all, most long M-mount lenses will work perfectly fine, as the photograph above testifies. From f/2.8 to f/11 pictures made with the Elmarit-M 90/2.8 are very sharp from corner to corner. Aperture has far more impact on depth of field and subtle glow than on sharpness.

An old Summilux-M 75/1.4 will make you weep. An Apo-Summicron-90/2 on an A7r will be sharp enough to cut through adamantium as easily as through your wallet (please, Philippe, buy one and let me review it πŸ˜‰  A nice APO-Tely 135/3.4 combines great sharpness with a tiny hint of wide open glow that softens contrasty images.

Sunset over Provence - Sony A7r & Leica APO-Telyt-M 135/3.4

Sunset over Provence – Sony A7r & Leica APO-Telyt-M 135/3.4

Secondly, try to understand your lens before evaluating technical performance :

  • Landscape lenses should be perfectly sharp all over the frame at f/5.6 – f/8 at infinity. The rest matters little as you’ll probably be using a tripod if you are serious about landscape photography.  Any corner smear at that aperture is a definite reject in my eyes, particularly as better alternatives exist.
  • Portrait lenses are designed to isolate a subject from its environment. They often have a curved focal plane and shooting test charts or brick walls will provide absolutely no indication of performance for the intended purpose.
    A Summilux-M 50/1.4 may disappoint in the corners, as Philippe’s account will show, but tone and image beauty are second to none in the right conditions. A specialist lens such as the SLR Magic HyperPrime 50/0.95 is ever worse. Forget technical reviews for these lenses.
  • Generalist lenses don’t really exist. The excellent and heavy Zeiss OTUS 55 may fall in that category if weightlifting isn’t an issue, but most lenses of Leica-M caliber are designed with a clear purpose in mind. Judge accordingly.

Finally, it’s probably too early to draw any conclusions regarding WA M-mount lenses as it appears not all adapters on the market are designed for full frame many mess with image corners. When the new range of Voigtlanders and others arrive (Philippe will soon report on these), things may begin to look up.

Lens R Us

But remember there’s also Leica-R.

A few examples :

Snobs view this range of lenses as technically inferior to the M line and yet, in the 90’s Leica themselves called the (last generation) R range their Best Lenses Ever Made. Since then, a few M lenses have overtaken them in technical quality – albeit with a different rendering – and not that many.

Two versions of the Leica Elmarit 90mm f/2.8 lens

Two versions of the Leica Elmarit 90mm f/2.8 lens

“But they’re huge!”, I hear you lament. Not so.

Almost all R lenses are wider than their M equivalent, but also shorter, as you can see above. On the camera, the much longer adapter does make the lens protrude significantly more, but the handling is simply perfect – better than with the shorter Ms in my book, with the aperture ring closer to the camera – and, in the bag, size and weight are not any higher.

Plus, as explained by Thorsten Overgaard, looser tolerances in the design often make R lenses optically superior to their M counterparts ! In real life comparisons between the only 2 equivalent pairs I have owned (Summicron 50/2 and Elmarit 90/2.8) I have never been able to distinguish between the two.

Led bokeh - Sony A7r & Leica APO-Telyt-M 135/3.4

Led bokeh – Sony A7r & Leica APO-Telyt-M 135/3.4

Minimal focusing distance and wide angle compatibility are two additional reasons not to discard the Leica-R too hastily.

The twin lens picture above was made with a last generation Summicron-R 50 at f/2 (reviewed here on a Sony NEX-5n). Note the superb bokeh and the close up ability that is way beyond what the Summicron-M 50 could achieve.

Leica produced a wide range of very fine wide angles such as the Elmarit-R 19/2.8 (which I own but haven’t been able to review yet), the Elmarit-R 24/2.8 (samples here), the Elmarit-R 28/2.8 (expensive in its version II E55 guise) and the Summicron-R 35/2, which I use a lot and reviewed on a D800e. Their MTF curves may not compare favourably to the more recent M wides, but on the A7r, they’ll give you better pictures 90% of the time (no fringing, no smear).

Then obviously, there’s the price … A (technically superior) APO-Summicron-M ASPH 50/2 will set you back 10 times the cost of an A+ Summicron-R 50. Put another way, the AA 50 costs the same as a Sony A7r, an Elmarit-R 24/2.8, a Summicron-R 50/2, an Elmarit-R 90, filters, bag, tripod, adapters and a trip to a great location … Your choice πŸ˜‰

Cathedral spire - Nikon D800e & Leica Summicron-R 35/2

Cathedral spire – Leica Summicron-R 35/2

A word of caution! Many of these lenses were produced in multiple versions and not all are great (eBay prices reflect this). A good starting point for information, brochure, MTF curves … is the Leica Wiki R page.

Closing thoughts

There is a very strong focus in lens reviews on sharpness at all apertures and focusing distances. And it is important to use sharp lenses, particularly on a sensor as fantastic as the A7r’s.

But image aesthetics are at least as important.There are many gems in the older M-mount lineups that I hope to explore, such as the old Summitars or the Summicron 40. These are nowhere near good enough according to modern reviewing standards but beautifully sharp where it matters and render scenes and portraits with a finess that is all but lost in the more clinical lab champs. The latter, however, offer a transparency and clarity unobtainable with the older designs. These considerations are far more important than sharpness.

So Leica-M or Leica-R is more a matter of compatibility with the sensor than relative technical merit. Stay away from any deisgn, however brilliant on a M240, that shows smearing in the conditions you plan to use it in. Compared to this, any wave in an MTF curve is absolutely negligible.

A food and wine market in Rognes, Provence - Sony A7r & Zeiss Distagon 25mm f/2 @f/2

A food and wine market in Rognes, Provence – Sony A7r & Zeiss Distagon 25mm f/2 @f/2

Finally, relax and enjoy shooting. In the picture above, the two chaps on the left were handing out tasters of truffle-butter on home-baked bread accompanied by a glass of their best white. That’s so much more enjoyable than lp/mm count, rigth ? πŸ˜‰

NEW: Signup for DearSusan’s new tutorial on lens testing in the field. 7 aberrations explained plus tips on how to test for them and how to fix their effects in post-processing. It’s totally free and totally awesome πŸ˜‰

  • Lignum Draco says:

    Thank you. This was useful. I’ll stick to my current m-mounts on the a7 though as there is only limited room in my dry cabinet, and to start a R lens collection may drive me mad. πŸ™‚

  • […] Leica-M or Leica-R: which Red Dot for your Sony A7r ? […]

  • Megatron says:

    I got some R’s for my Canon 6D, and they are amazing. The cron 50mm is by far my favourite lens, perhaps of all time. Perfect size, weight and amazing rendering. It balances perfectly on the 6D (which has interchangeable focusing screens), and I got a leitax mount, so it’s borderline fused to the body. Stopped down to f4 or 5.6 it can out-resolve my sensor. Sure, the otus can perform better, but it weighs 1 kilo and costs more than twice my camera and entire lens collection combined! Highly recommend the Summicron-R 50 as a perfect and affordable FF lens. If only it went to 1.4….

    • pascaljappy says:

      Yes, they are amazing. After using Nikon lenses (which may be as sharp in lab tests) for years, these were a revelation. Ironically, I didn’t like the Cron 50 on my NEX-5n. The 75mm eq focal length probably didn’t suit me. But on full frame, it is absolutely perfect. All my Leica-R lenses use a Leitax adapter, so I am now using them with a Nikon adapter on the A7r πŸ˜‰ πŸ˜‰ 1.4 would be great but I never bought the Lux-R 50. For some reason it didn’t appeal to me as much as the Cron. I’d love the 80/1.4 though … If anyone reading wants to get rid of his … πŸ˜‰ Cheers.

  • […] reviewing a slew of Leica lenses on my A7r. My first discussion on Leica-M vs Leica-r is here : http://dearsusans.wordpress.com/2013/12/19/188-leica-m-or-leica-r-which-red-dot-for-your-sony-a7r/ and I will soon be posting a review of the Apo-Telyt-M 135/3.4 (great lens on this camera ! […]

  • mb-de says:

    I have been using Leica M and Leica R “glass” on film for several decades now, and I have successfully ‘transplanted’ most of them to digital bodies (Novoflex, Fotodiox, Leitax and others have made this possible at very reasonable cost by delivering good quality adapters…).

    Leica R glass + A7 has been a winning combination for me, as has been the combination of ‘longer’ (f>=28mm) Leica M lenses.

    I particularly like the Summicron 50 (1976+ R and both Type III (1969+) and Type IV (1979+) M), the Summicron M 90 Type III (1980+), the Elmarit R 135 and the Summilux M 35 (1961+ = 11871) – the latter being a rather specialized lens (wide open it is ‘dreamy’, at f/8 its contrast and rendering comes into the Summicron range)… I tried the Summilux R 80 (and have decided that I need to sink some money into it) and the
    Elmarit R 19 (1975+) with good results as well… the Summilux M 75 is a dream for portrait, but too specialized for its current price tag…

    Even on the NEX-7, these lenses allow for very decent results.

    Best regards,


    • pascaljappy says:

      Hi Michael, your experience mirrors mine. I think these R lenses are greatly underestimated. The Summilux 35 would be nice to test! I’ve never had one myself. The R80 must be a glorious lens too. I’ll review the R19/2.9 II soon and that too is very good, although a bit pricey.

      All the best,

  • M says:

    You ought to find an 80 Summilux to test out as well. Optical design is closely related to the 75 Summilux M. Classic portrait lens, forgiving and not all-to-sharp at Ζ’/1.4 but with a dual personality, high-resolution stopped down.

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