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FEATURED WEB TUTORIAL: LENS

 

Testing Wide Angle Lenses

So you've decided to take the plunge on a super-wide lens. But you've done enough reading to know that not all of these lenses are created equal. Some provide sharp clear images and others distort reality more than a congressman.

How do you know what you're getting? You can read reviews and see what they say about the lens if you're looking at new lenses. But those reviews sometimes leave a bit to be desired, and they're not even an option if you're looking at a used lens. The good news is that there's a simple way to get a feeling for how much a lens distorts. It's called the brick test - and it will take longer to read this article than to do the test.

The type of distortion that you're most likely to see in a wide-angle lens is rectilinear distortion. Rectilinear distortion simply means that straight lines aren't recorded as straight lines by the lens but rather they curve across the image. ...

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