Leica APO-Summicron-M 50mm f/2.0 ASPH Lens

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Key Features

  • 50mm focal length
  • F2 maximum aperture; F16 minimum
  • Manual focus
  • 39mm filter thread
  • 0.70 m/27.56" minimum focus

Product Description

The Leica APO-Summicron-M 50mm f/2 ASPH uses specially developed glass in an apochromatic design which Leica claims minimizes chromatic aberrations. In fact, according to Leica at the time of its announcement, the APO-Summicron-M 50mm f/2 ASPH achieves the best results of any M-series lens in the entire 60-year history of the system. A floating element changes its position relative to the front group during focusing, ensuring that the lens achieves outstanding imaging quality throughout its focusing range, even at close focusing distances.


Principal specifications
Lens type Prime lens
Max Format size 35mm FF
Focal length 50 mm
Image stabilisation No
Lens mount Leica M
Maximum aperture F2.0
Minimum aperture F16.0
Aperture ring Yes
Number of diaphragm blades 11
Aperture notes Preset, with click-stops, half values available
Elements 8
Groups 5
Minimum focus 0.70 m (27.56)
Maximum magnification 0.088×
Autofocus No
Full time manual Unknown
Focus notes floating focus system
Distance scale Yes
DoF scale Yes
Weight 300 g (0.66 lb)
Diameter 53 mm (2.09)
Length 47 mm (1.85)
Materials metal barrel, metal mount
Sealing No
Filter thread 39 mm
Filter notes Inner-threaded for screw-in filters
Hood supplied Yes
Tripod collar No
Notes Built-in extending hood

Questions & Answers


Nex 5N or Canon 60D for slide copying?

First post. It's long. Sorry. My ancient Kodak RFS 3600 scanner finally bit the dust. I don't want to buy another scanner. I have a Nex 5N and a Canon EOS 60D, a big stack of slides, and an odd collection of lenses. Many of the slides are 35mm, but some of the older slides were shot on 127 film, and because they're all old family shots, I want to preserve them. I have a Canon FL Bellows and slide duplicator coming tomorrow, as well as an FL to Nex adapter. I bought the FL Bellows because it was dirt cheap. $20 for both it and the duplicator. The Novoflex bellows look great, but that's totally out of my budget. I have a bunch of Leica M lenses from 7 years ago, when I shot my M6 a lot-- 21/2.8, 35/2, 50/2, all from ~2002, and an old 90/2.8 from the 60s. I got the Nex so I could finally use the M glass again, because nowadays I cannot afford anything Leica. At all. I also have an EF 50/1.8, and the 17-55/2.8 EF-S zoom for the 60D, and the kit lens that came with the Nex. None of ...

rifo asked
2 years ago


Interesting discussion.  I've done something similar, though I had a different approach to the problem of capturing a full frame slide.  Instead of using a shorter focal length lens, I used a shallower NEX adapter, in order to essentially reduce the bellows extension.  I did it by grafting an M39 adapter on the back of the bellows unit: For a more extensive description, I started a thread here: http://www.fredmiranda.com/forum/topic/1137072 There are also some samples. I didn't have any stability problems with the slide holder -- perhaps the one I bought was less worn, or maybe it's because I have the front bellows attached to the lens (using a 52-55mm step up ring, since I'm using a 52mm thread FD lens on the FL bellows, which presumes a 55mm front thread on the lens). Continue Reading

Smiert Spionam answered
2 years ago

I don't think it looks ridiculous at all. That looks like a good working setup. Your results seem to be fine, so far as I can judge from the reduced size JPGs on the web. Is the grain of the Velvia clearly resolved? I agree f/8 is the best aperture to use. I think the Sony sensors are better than Velvia. I can't see any point in shooting on film nowadays and then scanning or copying. Sensors are simply better than film - and for this kind of landscape shot the NEX senors are not even the best. The point for me is to digitise and clean up the old slides from pre-digital days. Continue Reading

D Cox answered
2 years ago

To copy 35mm slides, I'm using 5N + SEL 30mm Macro plus a cheapo, no-name slide holder that attaches to the front of the lens using step-down rings. I found the slide holder at Goodwill for a couple bucks. It holds a slide about an inch from the end of the lens body. I point the camera toward a bright sky or window, and snap in Program mode. There's slight vignetting in the corners, but I don't care because almost every slide copy gets cropped in PP. Continue Reading

Zindanfel answered
2 years ago
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