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A photographic lens is used to focus the light onto film or a digital sensor. Many cameras have interchangeable lens systems, allowing the photographer to choose the type of lens to use.

2 votes

What's an excellent walkabout lens?

There's an f/2.8 version of the lens (vs. my f/2.8-4) that I'd get today, if I were buying it again. I'd like more reach from time to time, but that's why I have a longer lens in my bag. … There's no such thing as a perfect lens for all situations, IMHO, which is why we have SLRs. …
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23 votes
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Are Sigma lenses comparable to Canon lenses for a Canon camera?

But it's a disturbingly versatile lens. The 30mm is incredibly sharp, and f/1.4 is something you just have to use to understand why you want it. … My 17-70mm is a great compromise lens; it's almost always attached to my camera, and I switch off when I have a particular need. And, quite frankly, it's tough to touch Sigma on price. …
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