A sharp lens can make the difference between a quality exposure and amateur work. There are many different aspects that can affect a photograph, including lens speed, minimum focus distance, type of lens elements, lens weight and stabilization. For many photographers, the first aspect for evaluation is the sharpness, or contrast, of the exposure. You can discover how sharp your lens is by setting up a simple test at home and trying different options.
1Secure a piece of newspaper to a wall with scotch tape.
2Illuminate the paper with two high power lights, such as LED flood lights. Direct the light to illuminate both sides of the paper.
3Place your camera on a tripod. Make the appropriate exposure with the lens auto focus.
4Open the lens to the widest aperture, or the smallest number setting. Take a picture.
5Make an exposure for each aperture, until the lens is at its smallest opening.
6Examine the results of each aperture, looking at the sharpness of the center of the frame versus the edge of the frame. You are paying particular attention to the sharpness of the text.
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