Canon Lens EF 135mm 1:2 L USM

Aperture Range [f] 2.0 to 32 Closest Focus 0.9m / 3 ft.
Dimensions 112mm x 82mm / 3.2 in. x 4.4 in. Magnification Ratio 0.19x / 1:5.3
Weight 750g / 1.6 lb Filter Size 72mm

Analysis of this lens resolution chart revealed that it is the sharpest at wide range of apertures, from f/2.0 through 11. The image quality on a camera's chip depends on the distance from the center, as shown below, with the average resolution in hundreds of line widths per picture height (LW/PH) given below each chart.

lens quality test

The sharpness is exceptional throughout the entire frame, and reaches the theoretical maximum (resolution of "37" is the max. theoretical number in this test) very often. It is the sharpest prime lens I've tested. Contrast in the center is slightly lower at f/2.0 as it shows as discolored rings.

Vignetting is low even at f/2. Chromatic aberration is virtually non-existent. The size of the circles remain constant trhoughout the frame. The circles are slightly ellipsoidal at the frame edges (2% difference in the extreme diameters), a distortion that is not noticeable on 'real' photos.

This is a 'must have' lens for portrait photographers. Stellar sharpness performance.

back 

© 2009 PikesPeakPhoto. All rights reserved.