ライカR用標準レンズ、SUMMICRON-R 50mm F2をデジタルカメラで使用した記録である。

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As for the 50mm focal length lenses called “standard lenses,” LEICA’s SUMMILUX series are very popular, so the R-type SUMMICRON in particular is in the shade. The lens used for this introduction is a new type ROM-type lens.

I have bought and sold this lens about three times, but recently I have been using it occasionally for the following reasons.
When used with manual focus on a single-lens reflex camera (especially with the CANON EOS viewfinder), comparing the yield of focus at the maximum aperture of f/2 and f/1.4 of the SUMMILUX, I find that the SUMMICRON has a better yield and does not miss focus (when used with the EVF). (I have no concerns about focusing accuracy even with SUMMILUX.) While some may consider using the SUMMILUX with a wide aperture, I prefer to use the brightest lenses with a wide aperture.
The lens barrel is 16mm shorter and more compact than the SUMMILUX, and when mounted on an EOS-1 series camera with an integrated vertical grip, it fits easily into a camera bag, which is also an advantage.
This lens can be used with the EOS-1DsMKIII without any problems.

Lens specification
The SUMMICRON 50mm has two types of lens barrels: an older model with a separate hood and a newer model with a built-in hood.
The old model includes 1-CAM, 2-CAM, and 3-CAM, and some of them may have been converted to ROM, but I have never seen them. Newer types include 3-CAM, R-CAM, and ROM-CAM.

focal length(mm)52.5
Maximum aperture2
Minimum aperture16
Lens configuration4groups 6elementsGauss-type
Minimum distance(m)0.5
Lens length(mm)42.8
Lens max diameter(mm)64
Filter diameter(mm)55

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