In the center of the frame almost every lens will render a perfect circle, but only lenses with very low optical vignetting will keep this shape in the corners. Without going too much into technical details optical vignetting leads to the truncation of light circles towards the borders of the frame. Very fast yet compact lenses usually show a significant amount of optical vignetting. It is recommended to have a look at this article first to get an idea how this brightness graph works. These values are about average for a lens with such parameters. Stopped down to f/5.6 roughly 0.7 EV remain. Wide open vignetting in the corners is 2.2 EV and it improves to 1.2 EV at f/2.8. These integrated hoods are great and it is a shame you only encounter them so rarely.Īpart from the glass inside and the red dot on the outside the lens features an all metal construction, all the markings are printed and engraved. The integrated hood is retractable and does not wobble in any position. The focus ring has just the right resistance (and it takes ~225° from infinity to 1.0 m), the aperture ring has half-stop click-stops but could be slightly tighter. This is a Leica lens, so you probably expect perfect build quality with very tight tolerances as well as superb handling, and this is mostly what you get. Handling / Build Quality Leica Summicron-M 90mm 2.0 (pre Asph) In Germany buying one in A-condition will set you back at least 650€. This pre-Asph version usually starts selling for $800 at (affiliate link). Maximum Magnification: 1:9.2 (with Helicoid 1:6.3).Close Focusing Distance: 1.0 m (with Helicoid 0.73 m).Number of Aperture Blades: 11 (inwardly curved).I am reviewing the “pre-Asph” E55 version here which has the following specifications: This one came as E49 version where the retractable lens hood covers the aperture ring and a more common E55 versionĪlongside these three there are also 90mm 2.0 lenses with Leica R-Mount on the market which are usually cheaper, but not nearly as compact (especially when taking into account the necessary adapters). Summicron-M (III) 90 mm 2.0 (often referred to as “pre-Asph”).There are roughly three different versions with Leica M-Mount that have been produced in meaningful quantities:
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