Using a different lens every week (ahmm… well) for 70+ weeks (or more)… ;)

Leica M Secrets Part 2 – 35mm Lenses

Perhaps the most versatile lens of all, the 35mm. Leica has a long tradition in designing that focal length. The first was the Elmar 3.5/35 in 1930! It was a very compact lens that offered a a wider Depth-of-Field than the popular 50mm and thus perfect for the newly developing form of dynamic urban reportage photography.
There have been two differnt 35mm lens types in the Leitz program, the Summicron (since 1958) and the Summilux (since 1961). When the first Summilux was introduced it was a dream right from the beginning. Such a fast wide angle lens has never been on the market before. Leitz Canada was able to find a compromise between a huge aperture and a wide Field-of-View. In the 60s that was a sensation, today this lens is not convincing anymore. The first version of the Summilux 35 shows wide open a low contrast, is prone to flare and coma. Today this lens cannot be recommended unless you are a collector or want that special effect caused by aberrations. The double-gauss construction was so difficult to improve that even that excellent and experienced Leitz designers were not able to succeed. It was the idea and feasibility of aspherical lenses that enabled the Leica labs in 1990 to launch a new Summilux 1.4/35 Asperical which showed a much better performance, but which was – due to its two aspherical lenses – absolutely uneconomic. That is why that lens was on the market for only four years, until the latest version was published in 1994. The latest design offers a fantastic performance despite employing only one aspherical lens. So, if you want a 1.4/35, you should go for the latest version and keep your fingers off the first one.
Perhaps you don’t need f/1.4 and are happy with a 2/35, or you don’t feel like paying the money for a Summilux, the Summicron might be the lens for you.
The first Summicron was launched in 1958 as an eight element design. Strangely enough the Summaron 2.8/35 was marketed in the same year which made use of the new Leitz Lanthanium glass that could be molten without the radioactive Thorium. The highly refractory glass allowed a better correction which improved the speed of the Summaron from f/3.5 to f/2.8. The Summicron benefitted from the new glass as well, the f/2 performance, however, was not on a level that we wish for today. The Summicron six lens successor of 1969 offered a higher contrast but mainly with a distinctive hot spot in the centre and weak corners. A re-design in 1971 did not improve things a lot. The fourth version though, the one published in 1979, was a huge step ahead and offered a considerable plus in performance. The latest edition, the Summicron 2/35 Asph, provides an even better performance with a vastly improved overall contrast and a fantastic 3D effect which this lens is famous for, but many users say that it has lost the characteristic and very pleasant bokeh of the fourth version. Anyway, the 1979 Summicron 35 is perhaps a fantastic way to save some money if you find a good copy on the used lens market.
(Source: LFI 2006)

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