Canon EF 50mm f/1.4 USM review at photodo

"Weighing only 290g the size and weight of this optic is pretty much what you'd expect of a standard prime. The lens barrel is made from satin-finished black plastic, which may show marks easily if abused.

Being an ultrasonic lens, full time manual focus is available, which means you can grab the focus ring at any time to adjust focus. The focus ring is located halfway up the lens barrel and has a nice grippy

textured rubber surface. A distance scale window is located just beyond the focus ring, which has a depth-of-field marking for f/22. Although these markings are clear enough to use for f/22, it would've been nice to see a larger display with some extra markings for other apertures for setting the hyperfocal distance. When manually focusing the ring is nicely damped and stays put.

58mm filters can be attached to the front. The filter thread does not rotate during focusing which will suit users of polarising filters. The lens is not an internal focus design and the entire optical group moves back and forth inside the lens barrel. Focusing isn't as quick as with other Canon USM lenses I've used, but is still plenty quick enough for all but the most demanding applications. In low light the lens didn't hunt on the EOS 5D MkII, finding focus in a reassuring manner.

As is typical for most 50mm lenses, the performance wide open is pretty good in the centre, but falls off the closer you get to the edges. Stopping down to f/2 results in a massive leap in centre sharpness, but the quality towards the edges still lags behind somewhat. It's only at f/2.8 that we start to see good resolution towards the edges and peak quality across the frame is achieved at f/5.6, where the sharpness is just short of excellent across the frame."

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