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Flash is a necessary evil in insect photography. This necessity is due to two unfortunate traits shared by most insects: small size and stubborn unwillingness to sit still for the camera. These traits confound each other in a way that renders insect photography uniquely challenging. Small subjects need to be close to the lens, placing them squarely in the zone where depth of field becomes razor-thin. Depth of field can be increased by using a small aperture, but that restricts the amount of light reaching the sensor. With so little light entering the camera, a proper exposure requires the shutter to be kept open for a long time. As most insects are busy creatures with better things to do than wait about for the shutter to close, getting a clean shot under natural lighting requires a fair bit of luck.

The easiest solution is to augment the ambient light with flash, allowing for faster shutter speeds. This is what most insect photographers do, although flash comes at considerable aesthetic cost. (more…)

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