One of the great lenses
This lens is very well built, it may not be fully sealed but in my opinion that's the only thing stopping this having a red ring. The lens does not move either the front or rear element for focussing which means it is naturally reluctant to attract moisture or dust internally.
The proper ring-USM focuses nearly immediately, it's frighteningly sharp even wide open, the Boke and low light ability is lovely thanks to its wide aperture.
What would I change?
IS is obvious by its absence, but that would bump up the price and frankly is unnecessary given its wide aperture.
I would probably change the aperture blades by adding one as this currently has an even number and that means half as many spikes on sunstars when stopped down... that's it.
As anyone can see I'm scraping the bottom of the barrel to find anything wrong with this lens.
January 16, 2014
Despite its age, that's still an amazing lens.
Unfortunately, it lacks the stabilizer and the AF is not up to the best Canon lenses, but other than that, this lens is just great. Distortion is negligible, vignetting is very well controlled and sharpness is very good throughout the whole frame even at f/2. Bokeh is nice even stopping down. Build quality is good and the quite large MF ring is very helpful if you use the lens with a follow focus. In my opinion, the only reason to spend more money for the 135/2 is the addictional focal lenght and the "L" built quality. Other than that, you won't miss anything with the 100/2. I really hope for a new IS version with the same optical quality...
May 20, 2013
I love this lens
I love this lens, I use it on a Canon 5D Mark II for very low light theater photography and I get some really stunning photographs. Even in situations when there is almost no light I am able to obtain really good results.
December 20, 2012
Excellent mid-range prime
This is an amazing and affordable mid-range prime lens. Often over shadowed by the 85 f1.8, the 100 provides a little more reach for those of us that don't like to be too close.
The bokeh is smooth, the images sharp. The focus is acceptable, however, does hunt in low lighting, despite the f2.
I have "L" lenses, and I can honestly say, this is one of Canon's non "L" that feels, shots and performs like it deserves the red strip. Excellent lens.
June 10, 2012