though my experience with the 50mm is, as fstopjojo reports, that it's terrific except against the light, when the IQ fall apart. I'm going to find a tele rubber hood and see if that helps. Apart from the flare, and the slightly clunky focusing (which, by the way, is excellent for manual focusing), it's a great lens.
This is true. While magnificently sharp, the 50EX takes a hit when shooting in harsh lighting conditions and renders much more "hazy" images that say, for example, the Canon 50 f1.4, which held together better in exact conditions rendering strong tonalities and contrast. Stopping down the EX helps a lot. A lens hood will certainly be of help.
ps note to fstopjojo - have you looked at the 105? They advertise it as having less flare, and after the loss of my 85/1.8 I'm looking at the 100-105mm options as well.
Phil, I've used the 105EX and it's very similar to the 50EX, just physically longer, bigger, with more WD. It's a fine lens, but both (along with the new 70EX Macro recently announced) have protruding focus barrels. This is one reason why I like the 150EX the best (with its non-extending barrel). You can't go wrong optically w/ any of these Macros