The EF 50mm f/1.2 L USM or Mark II lens
If you are shooting waist-up portraits while maintaining appropriate subject distance as a Full frame users you will appreciate the benefits of the 50mm focal length. on top of that, the large maximum aperture of f/1.2 delivers nice dreamy bokeh and makes subjects “pop” out of a portrait. In low light situation, photographers can also take advantage of higher shutter speeds and help prevent subject blurring caused by subject movement or camera shake.
The EF 50mm f/1.2 L USM lens is designed keeping in mind the need for photographers shooting at extremely wide apertures. At f/1.2 this is as good as one can get for a 50mm prime. Being an L lens means there is an ample amount of attention paid to the over all construction quality of the lens. EF lenses are compatible with all full frame, APS-C and APS-H Canon cameras. If you have something like the Canon 650D or any of the Rebel series Canon cameras, your effective field of view will be 80mm making it ideally suitable as a medium range lens for portraits, wedding, standard everyday photography.
The EF 50mm f/1.2 L USM has a total of 8 elements, including one glass-molded aspherical element, arranged in 6 groups and the diagonal field of view is 46˚. Auto-focusing is one of the dissatisfying aspects for the lens in spite of the fact that this is a very sharp f/1.2 lens. However the presence of full-time manual focusing means the lens can be tweaked by turning the focusing ring at any time to achieve precise focusing. Additionally the lens has USM (ultra-sonic motor) which means the lens is ultra quiet when focusing.
The lens diaphragm is made of 8 rounded blades and the maximum f-stop achievable is f/1.2. It can also stop down all the way to f/16.
The overall dimensions of the lens are 3.4” x 2.6” (diameter x length) and weighs 545 grams only. The lens takes a filter size of 72mm. A plastic bayonet mount ES-78 lens hood is provided along with the lens.