Hacker
Senior Member
Leitz Summar 5cm f2:
"The Summar is Leitz's first f 2.0 lens, introduced in 1933. It shows it's best results between f 3.2 and 6.3. In this range, it is comparably sharp, like my Kodak Retina Ia 3.5/50 mm Xenar from the 50ies. In this range, it is a "high contrast lens", but different than we use the phrase today. Here it means, that the lens shows clear colors but hardly shadow details. To give an example: When you look at a tree at dawn or sunset, you clearly see the colors of the bright parts, but the shadows are gone and almost black. That's what the lens does, even in bright daylight. Additionally, the unsharp areas are more unsharp than in a "usual" 50 mm, almost like from the 2/90 mm M Summicron. Both effects (suppression of shadow details and "increased" unsharpness) result in the most impressive 3D or pictoral effect I've ever seen from a 50 mm, incl Noctilux. The highlights are over-pronounced, which gives an additional impression of light in your pictures (like in impressionism). At f 2.0 the corners tend to be dark and the colors are almost gone. It is a warm to neutral lens."
Source, Mr. Alfred Breull: http://antiquecameras.net/leicalensreviews.html
"The Summar is Leitz's first f 2.0 lens, introduced in 1933. It shows it's best results between f 3.2 and 6.3. In this range, it is comparably sharp, like my Kodak Retina Ia 3.5/50 mm Xenar from the 50ies. In this range, it is a "high contrast lens", but different than we use the phrase today. Here it means, that the lens shows clear colors but hardly shadow details. To give an example: When you look at a tree at dawn or sunset, you clearly see the colors of the bright parts, but the shadows are gone and almost black. That's what the lens does, even in bright daylight. Additionally, the unsharp areas are more unsharp than in a "usual" 50 mm, almost like from the 2/90 mm M Summicron. Both effects (suppression of shadow details and "increased" unsharpness) result in the most impressive 3D or pictoral effect I've ever seen from a 50 mm, incl Noctilux. The highlights are over-pronounced, which gives an additional impression of light in your pictures (like in impressionism). At f 2.0 the corners tend to be dark and the colors are almost gone. It is a warm to neutral lens."
Source, Mr. Alfred Breull: http://antiquecameras.net/leicalensreviews.html
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