... The main problem with this lens is the speed, or the lack thereof. Compared to the EF 20/2.8, it's only a half stop slower but compared to the EF 35/2, it's one and a half stops slower. While this is not a big deal if you're shooting outside, you have a problem in low light environments. Secondarily, if you're shooting a small sensor DSLR, you're not getting the wide angle benefits of this lens.
For film or for full-frame 35mm sized sensor DSLR users, this is a good choice if you can live with the primary limitation of the slow speed. Optically, it's not bad at all. It has more distortion than an architectural photographer will want but if you're mainly shooting architecture you probably wouldn't be attracted to this lens anyway. As a reportage lens or a travel lens, it will serve well. Although it's relatively large--especially with the dinner plate sized lens hood in place--it's a lightweight. Build quality is industry-standard consumer grade for Canon. Which means it's actually very well put together from mostly plastic components. The lens mount is metal and the lens elements are, of course, glass. Autofocus is fast and the motor is a Canon Ultrasonic so you get the benefit of manual focus without having to flip switches to turn off the autofocus.
I've used this lens off and on for about eight years. I originally shot color nature and landscapes and this was a very useful lens for such purposes. I mostly used a tripod so having a slow lens wasn't a limitation. For the last few years, I have been doing only black and white film work with an emphasis on the artful aspects of photography. When I use 35mm, I've trimmed my most used lenses to mostly primes so this lens doesn't get selected as often as it once was. Still, when the light is bright, I sometimes use this lens for the convenience. It's very versatile with good performance. If used at medium apertures under the same lighting conditions, I seriously doubt anyone would be able to see any practical difference in photos made with this lens compared to one of the much more expensive L-series Canon zooms. For the price, it's very good value. ...
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