How to Choose a DSLR Lens
DSLR (Digital Single Lens Reflex) cameras differ from the more common point-and-shoot cameras in that DSLRs feature interchangeable lenses. Rather than being restricted to the single, fixed lens of point-and-shoot cameras, users of DSLRs can use a variety of lenses on their cameras to tackle a wider variety of situations. But with many DSLR lenses costing between $300 and $2,000, the choice can be difficult. Before choosing a DSLR lens, it is important to consider your reasons for needing a new lens and to ensure that your lens purchase meets these needs.
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Instructions
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Pick a brand that you know and trust. The quality of different lens makers varies dramatically, and one lens with certain specifications will not necessarily be equal to another lens with identical specifications. While Canon and Nikon are almost always good choices, do not overlook the benefits of saving money with a less-expensive manufacturer--like Sigma or Tamron--or the quality of the premium lens manufacturers--like Leica.
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Begin with the zoom needs of your lens. For instance, if you plan to use your lens for animal or sports photography, you will need a long telephoto lens. If, though, you plan to use your lens to shoot mostly interiors or landscapes, a wide angle lens is a better choice. Lenses with huge zoom ranges tend not to take as sharp of pictures as those with smaller zoom ranges, so select a zoom range that most accurately suits your intended uses.
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Consider the amount of available light you will have when shooting. If you will likely have a lot of available light then you can choose a lens with a smaller maximum aperture, such as f/4 or f/5.6. If, however, you will be shooting venues that tend to have a lot of movement or low light, you will need a lens with a larger maximum aperture, such as f/2.8 or f/1.8.
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Compare features once you have narrowed down your lens selection. Most lenses will have autofocus capabilities but not all will have Hyper Sonic Motors (HSM), which speed up your lens' autofocus capabilities, or Image Stabilization (IS), which is an internal gyroscope that helps to steady your lens. HSM lenses are vital when quick focus is necessary while IS lenses are useful in steadying a photographer's long telephoto shots.
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Tips & Warnings
If there is a lens that perfectly meets your needs but is a bit pricey, it is often better to wait and save money or find an identical used lens rather than to settle for an inferior lens that does not meet your needs. A lens you never use was not worth purchasing. Only procure lenses you know you will be happy with.
Not all lenses work with all DSLRs. Even lenses made by your camera's manufacturer may not work with your camera. Verify the lens's compatibility with the manufacturer or retailer before purchasing the lens. In physical stores, ask to attach the lens to your camera to ensure compatibility before making the purchase.
