definitely met expectations. what a difference between cheapo entry-level sigma and EX series. nicely finished, even rugged, yet still light and small. [...]at $[...], not so much of a value--consider the tokina 10-17 instead, which gives you zoom, but is probably not as sharp. 2.8 aperture is nice and fast, and 15mm is plenty wide for most situations except dedicated landscape photography -- consider tokina 12-24 or nikon 10.5 fisheye instead. here's a neat trick: w/lens hood on, rounds off corners for added effect. fisheye isn't as pronounced as one might think (maybe due to 1.5 mag factor on dslr), which means you can use this as a wide angle lens. overall it's a very fun lens to use. recommended for live action shooters who need a fast, high-performance piece of glass for indoor and low-light situations.
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