The Canon EF 50mm f/1.4 USM lens comes with a wide opening of its aperture at around f/1.4. This lens is dedicated to both consumer and professional photographers as it is considered as the least expensive of all lenses that comes with the same type of aperture opening. The lens was released in June 1993 and sales of this lens is still soaring. This particular lens is made with a plastic body with a metal mount. Moreover, the lens also features a distance window with an infrared index. Similar to the EF50mm f/1.2L USM lens, this one comes with an 8-blade diaphragm which gives the lens its ability to have a wider opening for its aperture.
Since the lens has the capacity to have a wider opening, it allows you to take photos that have a very shallow depth of field. The optical architecture of this lens comes with 7 lens elements in six groups without special lens elements. The Canon EF 50 mm f/1.4 USM lens comes with a front extension focusing system that is powered by a small USM motor thus making this lens very silent. Although the lens is powered by the USM motor, it still comes with a full-time manual focus. This particular lens has a fast auto-focus speed but is not as quick as other expensive USM-based lenses like the f/1.0L and f/1.2L USM lenses. The front of this particular lens does not rotate but can be extended to one centimeter when you focus.
The lens is designed as the standard lens for the 35mm full-frame format as it comes with a good angle of view that prevents any distortion on the images. Moreover, with the popularity of the APS-Cas which is the dominant sensor size for most DSLRs, this particular lens has taken on a new role and it is now considered as a short portrait telephoto lens for most digital camera formats. The image produced by this particular lens creates a natural blur for the background. This lens is also great in low light photography. Now what makes this particular lens preferred is that it is very cheap and you can buy it for USD $325 or around £274.29 HERE thus making it popular among photographers who want to take good pictures but on a very tight budget.