What We Like
+Compact and lightweight (340g) for a 90mm f/2 telephoto lens
+Apochromatic optics with anomalous partial dispersion glass minimize axial chromatic aberration
+Exceptional sharpness and edge-to-edge clarity across the frame
+12-blade aperture creates beautiful, natural-looking bokeh with circular opening
+Smooth manual focus with precise rangefinder coupling and responsive aperture ring
+Superior performance to Leica APO-Summicron 90mm f/2 at certain apertures with higher resolution and contrast
Worth Knowing
−Significant optical vignetting at f/2.0 aperture requires stopping down for even illumination
−Short focus throw demands precise manual focusing, particularly challenging on rangefinders at wide apertures
−Strong vignetting and precise focus requirements make it less suitable for portraiture than for other subject matter
−Difficult to achieve accurate focus at f/2 when using standard rangefinder viewfinder magnification