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Summary of Contents for Leica Apo-Summicron-R 90 f/2 ASPH
- Page 1 Leica R-Lenses by Erwin Puts August 2003 Chapter 2: 80 mm and 100 mm lenses __ LEICA SUMMILUX-R 80 mm f/1.4 __ LEICA APO-SUMMICRON-R 90 mm f/2 ASPH. __ LEICA APO-MACRO-ELMARIT 100 mm f/2.8...
- Page 2 (useful for landscapes, architecture, snapshots, animals). The 'ninety' is a lens that enables you to really investi- gate the Leica style of photography. If you look at many pictu- res, you will discover that often the image works overloaded as so many parts of the image ask for attention.
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Page 3: _Optical Considerations
With some effort you may detect in the design the vestiges of a Double-Gauss lens. Leica R-Lenses A true Double-Gauss design we find in the Apo-Macro-Elmarit-R 1:2.8/100mm. Here we have a six element construction with two separate thick elements at the rear end. - Page 4 If a lens is manufactured with such accuracy, you need a very careful assembly. The Leica-typical construction with metal parts of exact dimensionality is a necessary condition for a high quality Summilux-R 80 mm f/1.4 Apo-Summicron-R 90 mm f/2 ASPH.
- Page 5 2.8. Overall we may declare that all three lenses can exploit the high resolution of the future digital back and they even have some reserve capacity. Leica R-Lenses Aperture 2,8 High contrast. In the center very good resolu- tion, in the outer zones good resolution with some softness, astigmatism is very faint.
- Page 6 The true focus snaps into position on the bright screen. Relative Distortion __ LEICA SUMMILUX-R 80 mm f/1.4 Distortion is surprisingly low with only 0.2% and is even suitable for architectural photography. Vignetting is relativley high with 2.5 stops as a measured value.
- Page 7 In the outer zones the quality lags a bit behind, but for this type of photography that is not so impor- tant. Here you should look at the 20 Lp/mm as the guiding line. Leica R-Lenses Aperture Stop 2.8 Y'[mm]...
- Page 8 The unsharpness gradient is quite pleasing and adds to the impression of depth and space. Specular highlights are reproduced with finely nuanced hues and that again impro- ves the plasticity of the image. Y'[mm] Leica R-Lenses...
- Page 9 The Apo-Summicron-R 1:2/90mm ASPH is such a lens. It is really difficult to criticize this lens. Aperture Stop 2.0 __ LEICA APO-SUMMICRON-R 90 mm f/2 ASPH. At full aperture the performance is already as good as that of the Apo-Macro-Elmarit-R 1:2.8/100mm at aperture 2.8. For an aperture of 1:2 this is a most remarkable feat.
- Page 10 5Lp/mm is slightly reduced compared to the values at 2.8. Y'[mm] Distortion is low with 1% but may be visible on critical inspec- tion and suitable subjects. The Summilux is better here. Y'[mm] Leica R-Lenses Relative Distortion Y'[mm]...
- Page 11 The Apo-Summicron-R 1:2/90mm ASPH is a superb lens in any sense of objectivity, that beraks all previous limitations. With a weight of 520 grams and a small size it may be sen as the ideal standard lens. Y'[mm] Leica R-Lenses...
- Page 12 The Apo-Macro-Elmarit-R 1:2.8/100mm is such a lens. In direct comparison to the Apo-Summicron-R 1:2/90mm __ LEICA APO-MACRO-ELMARIT-R 100 mm f/2.8 ASPH, the maximum aperture is slower by a stop, the perfor- mance over the entire distance range uniformly high. These parameters define the choice.
- Page 13 1:1 macro position: the focal length is here 92mm. You will hardly notice it. The Apo-Macro-Elmarit-R is one of the very few lenses that per- forms at its best already at full aperture and does not improve on stopping down. Leica R-Lenses...
- Page 14 This aperture has limited depth of field and both effects work together to create images with high realism and good depth impression. Paul Wolff and Renger-Patch would love to use this lens! Y'[mm] Leica R-Lenses...
- Page 15 Leica R-Lenses Chapter 2 __To summarize These three lenses are on the one hand very similar and on the other hand represent very different worlds, optically and in practicaluse. The best optical performance we find with the Apo-Summicron-R 1:2/90mm ASPH. If the close focusing abili-...