Overview

Description by Canon:

A versatile, compact pancake lens. A fast maximum aperture enables low-light shooting and depth-of-field control. STM provides smooth quiet autofocus when shooting video with compatible cameras.

Canon EF 40mm f/2.8 STM lens review by Ken Rockwell: "The Canon 40mm is insanely sharp at every setting throughout the entire full-frame on the 22 MP 5D Mark III"

"This Canon EF EOS 40mm f/2.8 STM works perfectly with every Canon EOS camera ever made, meaning every Canon DSLR and every Canon autofocus 35mm camera made since 1987. Of course it works great on today's 5D Mark III and Canon 7D, but it also works great on my original 1987 Canon EOS 650! The only oddness I noted on my 1987 EOS 650 is that while auto and manual focus and depth-of-field preview and everything work great, manual focus override doesn't work: you have to set the lens to manual first. Manual-focus override works flawlessly on my 35mm EOS Rebel G from 1996 and EOS 3 from 1998, so I'm not worrying about it." . . . read more

Canon 40mm EF f/2.8 STM Lens review by Ivo Freriks at Camera Stuff Review: At the time of the review, the Canon 40mm STM is the best of all Canon lenses tested so far in terms of resolution.

The Canon 40mm STM pancake lens is perhaps, no, DEFINITIVELY, the sharpest lens south of the $/€/£ 200 line Canon has ever produced. It consistently scores very high on both full frame and cropped cameras, and mounted on a Dslr it looks almost as diminutive as the Olympus body cap lens on a micro 4/3 body, but with excellent optics. CSR tested this little gem mounted on a Canon 1Dx:

"The combination of a very compact and lightweight Canon 40 mm STM lens on a large, heavy professional camera may . . . read more

Canon EF 40mm f/2.8 STM at the Phoblographer: A tiny lens with a tiny focus ring that produces excellent results but needs some time to focus.

"As previously mentioned, the EF 40mm f/2.8 has a new type of AF motor for Canon, it is quite similar to what you would find in a mirrorless camera system. That being said I did find it to be a touch slower than my other canon lenses which have the USM motor inside, however the the slight lack of speed does not mean the lens is any less accurate. I did have to perform a microadustment of the lens with my 5DmkII but once done it has been spot on at all times. The lens does . . . read more

Canon unveils the EF-S 18-135mm f/3.5-5.6 IS STM and EF 40mm f/2.8 STM lenses

'STM' is the keyword here, and it stands for 'Step Technology Motor'. These are the first such lenses in Canon's line-up, and are optimized for video shooting. Their performance, speed wise is a step (no pun intended) below those equipped with USM. 

Canon Press Release. . . . read more

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