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Older Revision of Canon EF 50mm f 1 4 USM Lens

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Canon EF 50mm f/1.4 USM Lens


The Canon EF 50mm f/1.4 USM Lens is a prime (single focal point) lens made for the Canon EOS SLR cameras. The 50mm prime lens is considered as the bread-and-butter lens for a SLR camera, because it represents the "normal" perspective, which closely approximates the "normal" human eye's perspective in real life. Canon actually makes three 50mm primes lenses for its EOS SLR cameras:

  • Canon EF 50mm f/1.2L USM Lens
  • Canon EF 50mm f/1.4 USM Lens
  • Canon EF 50mm f/1.8 II Lens

All of these normal prime lenses are excellent in photo quality. The most significant differences are in their build-quality and technology, where lies the difference in suggested retail price. Out of these three lenses, the Canon 50mm f/1.4 USM lens is probably the best value for its performance, build-quality, and functionality.

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In the Box

The Canon 50mm f/1.4 USM lens comes in the standard Canon red and white lens box. Marking on the box is sparse. After opening the box, you'll find the warranty card and the instruction manual. Like instruction manuals for other Canon lenses, this one folds out into a large sheet with multiple languages. The lens is packed between two Styrofoam pieces and wrapped in a translucent plastic bag. It comes with a front clip-on lens cap and a rear Canon bayonet lens cap.

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Look and Feel

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Lens Hood

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Focus Mechanism As with any other Canon lens, the Canon EF 50mm f/1.4 USM lens has a AF/MF selector switch. When you switch it to AF, the lens auto-focuses when you hold the camera shutter half-way down. When you switch it to MF, the camera does not perform auto-focus and leaves manual focus up to you. The Canon EF 50mm f/1.4 USM lens has an ultrasonic motor (USM) for auto-focusing. Unlike previous technology, where the auto-focus mechanism is connected the lens electronics via mechanical gears, the ultrasonic motor is physically disconnected to the lens electronics and is controlled via ultrasonic vibration. The beauty of this newer technology is that auto-focus is extremely fast, auto-focus is extremely quiet, and manual-focus can be performed after auto-focus without disengaging auto-focus mode. The Canon EF 50mm f/1.4 USM does not have internal focus mechanism. Therefore, during focus, the front lens elements will extend and retract, increasing and decreasing the length of the lens. It has a non-rotating front, so it is quite convenient for circular polarizer use.

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Filter Thread

The Canon 50mm f/1.4 USM lens has a 58mm front filter thread. This is a standard filter thread size for most of Canon's low-to-medium-end lenses. Therefore, if most of your Canon lenses have 58mm filter threads, you can standardize to 58mm filters.

This is an excellent step up from the Canon EF 50mm f/1.8 II Lens, which has a 52mm front filter thread. With the Canon 50mm f/1.4 USM lens, you won't have to use step-up rings if you are already using 58mm filters.

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