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Leica 120mm f/2.5 APO-Macro-Summarit-S
Related: apochromatic, Leica M, Leica medium format, Leica S 120mm f/2.5 Summarit-S ASPH, Leica S Typ 006, medium format, MTF and Micro Contrast
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.
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Nominal, per Leica.
|Specifications for Leica 120mm f/2.5 APO-Macro-Sumarit-S|
|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|
|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)|
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.
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