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Leica 120mm f/2.5 APO-Macro-Summarit-S
Related: apochromatic, Leica Lenses, Leica M, Leica medium format, Leica S 120mm f/2.5 Summarit-S ASPH, Leica S Typ 006, medium format
The 120mm f/2.5 APO-Macro-Summarit-S is ostensibly a macro lens, but it should be equally at home for any kind of work. It is equivalent to a 96mm lens on a full-frame 36X24mm DSLR.
The 120mm f/2.5 macro affords close-up capability to 1:2 reproduction ratio, with a very good working distance of 57cm from the film plane.
Leica states that “a floating element ensures unmatched performance from infinity to extreme close-ups”. Which sounds terrific, since it might mean exception performance for landscape applications. But 1:2 is hardly an “extreme” close-up, but presumably it means the 1:2 close focusing capability is also excellent.
The 120mm appears to offer the highest performance of the S line, according to its MTF chart.
Standard 72mm filters can be used.
The 120mm offers tremendous versatility with a fast maximum aperture, its 1:2 focusing, and correction for both near and far imaging.
Specifications
Nominal, per Leica.
| Specifications for Leica 120mm f/2.5 APO-Macro-Sumarit-S | |
|---|---|
| Item | Value |
| Focal length | 120mm (nominal), equivalent to 96mm in 35mm terms |
| Lens construction | 9 elements in 7 groups with floating element and rear focus |
| Focusing range: | 0.57m /22.44 inches to infinity |
| Smallest object field: | 91mm X 128mm = 1:2 |
| Item Angle of view | 25°, 21°, 14° |
| Diaphragm: | f/2.5 - f/22 |
| Filters: | 72mm |
| Dimensions | 91mm diameter X 128mm long 3.58 in X 5.0 in |
| Weight | 1135g / 40.3 oz (1285g / 45.3 oz for CS version) |
MTF
Wide open at f/2.5, performance is very high over the entire frame. A lens this good would be the wish of many a 35mm DSLR shooter. However there is a drop in contrast at the frame edges into the corners.
Stopping down to f/5.6 improves contrast slightly over most of the frame, but with worthwhile improvement in the corners. How f/4 behaves is unclear. Overall performance is astonishingly high.
Mouse over to compare f/5.6.
Learning more
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