Canon EF 40mm f/2.8 STM Lens

The Canon EF 40mm f/2.8 STM lens is a standard/medium telephoto focal length prime lens with stepper motor technology (STM), ideal for video recording.

The STM technology works best with dual-pixel sensor cameras, allowing seamless auto-focus transitions and low-to-little noise from the motor, “Its diminutive design is complemented by features such as a newly developed stepping motor for smooth and quiet continuous AF while capturing video” (1).

The EF 40mm f/2.8 STM  lens is lightweight at only 4.6 ounces/130 grams, with a diameter x length of 2.7 x 0.9 inches.


EF 40mm f/2.8 STM Sample Image. Credit: Canon U.S.A., Inc.

Using a seven-blade circular aperture design, the EF 40mm has a desirable out-of-focus area, and macro-focusing capabilities, with a minimum focusing distance of 0.98 ft./0.30 m according to Canon.

Where does this lens lie? The EF 40mm f/2.8 STM  is not quite a wide-angle lens, and not specifically a portrait-lens, but somewhere in between.

Oddly enough, I like the field-of-view from the EF 40mm for recording myself at my computer desk for YouTube videos.

If you’re interested in this lens, click here.

  1. “EF 40mm f/2.8 STM.” Canon U.S.A., Inc. | EF 40mm f/2.8 STM, www.usa.canon.com/internet/portal/us/home/products/details/lenses/ef/standard-medium-telephoto/ef-40mm-f-2-8-stm.

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