Canon EOS 70D with 40mm f/2.8 STM Lens - Auto-Focus test with on camera mic
4,623 views · Published 7 December 2013 · 1:31 · Indexed 18 October 2026
Channel: Ask Joe - Joe Crescenzi - @AskJoe - AskJoe (.TV) · 2013 · Science & Technology
I've been asked to post some videos using the 70D AF-Servo mode using various lenses to see and hear, the auto-focus. This particular test is using the Canon 40mm f/2.8 STM Pancake lens. The focus seems pretty tight, with very little re-focusing, and the sound of the STM is still noticeable, but not as loud as non-STM lenses. Focus speed looks pretty quick. To simplify the test, the camera used automatic exposure and focus settings.
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