APO-SUMMICRON-R 2 / 90 ASPH.

This is a record of using the LEICA R mount, APO-Summicron-R 90mm F2 ASPH. with a digital camera.

Table of contents

Gallery
Impression
Lens specification
Reference links

Gallery
LEICA APO-SUMMICRON-R 90mm F2 ASPH. Photo Example
with LEICA M typ240 / CANON EOS-1Ds MK III / HASSELBLAD X2D

Impression
This lens has a thicker barrel than the old R-type Summicron, giving it a more massive appearance.
It is a lens with the latest aspherical surface and has good backlight resistance, and among the several medium telephoto lenses I own, I often choose this lens in this situation.
The image circle is wide, completely covering the 44*33mm used in the HASSELBLAD X2D (X1D/X1DII/X907/FUJI-GFX). Since there is no kicking around the edges, it is considered to be quite generous when used with a 35mm sensor. As a result, the lens provides abundant peripheral light and rich expression.

Compared to the well-known SUMMILUX-R 80mm/F1.4 R-mount lens, the APO-SUMMICRON-R 90mm is approximately 180g lighter and therefore well balanced when attached to a small mirrorless camera.
It also works well when attached to the EOS-1DsMKIII via a mount adapter.

However, it is one of the rare lenses with a significant level of difficulty in availability. The M-mount APO SUMMICRON 90mm is a current product, so it is possible to buy it new, and it is relatively common to find it on the used market, but the R-mount lens is rarely seen.
Fortunately, they can be found on eBay, so if you really want to acquire one, you will have to procure it from overseas.
This lens appears to have the same lens construction as the M-mount APO SUMMICRON, but when I compared the results when I owned both lenses at one time, the M-mount version was sharp in the center and a little loose around the periphery, while the R-mount version performed flat and high across the entire image (it is possible that each individual lens is unique). (It is possible that each individual has its own characteristics.)
In use, the M-mount version has a minimum focusing distance of 1 m, while the R-mount version has a minimum distance of 0.7 m, which I found pleasing.
The R-mount version is designed for SLR lenses, so the barrel is not concave or convex, which is different from the design of the M-mount version, which narrows down toward the mount. Personally, I prefer the straight barrel design.

When I owned both M-mount and R-mount APO-SUMMICRONs at the same time, I will post similar images from when I went out shooting with both. Although the slightly different shooting positions do not allow for an exact comparison, each has its own unique characteristics when looking at the details.

Specification
This is a medium telephoto lens for the Leica R. The filter diameter is E60 (60mm), one of the new generation of R lenses.
The old Summicron lens consisted of five elements in four groups with the second and third elements pasted together, but this lens consists of five elements in five groups with all elements independent of each other.

Item	Value	note
focal length(mm)	90
Maximum aperture	2
Minimum aperture	16
Lens configuration	5groups 5elements
Minimum distance(m)	0.7
Lens length(mm)	59.3	Distance from mount flange
Lens max diameter(mm)	71
Filter diameter(mm)	60
Weight(g)	520