Summary: I've only had the lens for a month and it seems to be working out great. I'm no expert and usually have my camera set to "Auto" and the picture quality with this lens seems to be very good. I'm anxious to use it on my upcoming trip to Australia.
Summary: The other reviews are spot-on: It is well constructed. There is a little blur at high magnification. There is some distortion at the edges. You can't use it with the on-board flash because it blocks a portion of the light.
Summary: As the Canon Powershot S5IS camera has 36mm at the extreme wide angle, it helps to attach the WC-DC58A Wide Angle Converter Lense for covering more horizontal and vertical view of any given scene, as it gives 27mm at the extreme wide angle.
Summary: I purchased this for my S3 IS. Gives you that extra little bit. I can't say enough about Canon's optics, the picture quality is excellent. I bought this lens and the teleconverter lens from Amazon for half the price I was quoted from a brick and mortar shop.
Summary: This lens is what can be expected from Canon.....a great quality product but, with the brand name comes the price as well. My only issue is with the fact that with the addition of this lens the regular flash leaves a shadow and is basically useless.
Summary: I bought this on impulse before leaving for a trip to the National Museum of the U.S. Air Force in Dayton, Ohio. I had buyer's remorse immediately after ordering all the way to the point of entering museum, at which point I nearly broke my arm patting myself on the back for my wise decision.
Summary: This was a great purchase for me. For family shots indoors, or even outside landscape scenes, it works very well, capturing a lot more panorama than you could otherwise. But one word of caution. At maximum magnification with my Canon S5 IS, I got a little blur, and not just around the edges.