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As with eyeglasses, having a carefully crafted lens — “good glass,” in photo lingo — is critical to image quality. Unfortunately, it's not practical for most of us to test lenses to find the best performer. The good news is that lens reviews are readily available in photography magazines and at online photography sites.

One thing you can predict with some confidence is that a larger-diameter lens will produce sharper, better images than the tiny lenses found on smartphones and tablets. Then again, cameras that sport larger lenses typically lack that oh-so-handy flashlight built into most smartphones. What can I say; life’s just one tradeoff after another.

See the section “Looking at Lenses,” later in this chapter, for other tips on buying a lens.