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shutter speeds reasonable for video and for still photographers making long-
exposure images.
For close-up work, adapters with helicoid extension allow you to keep the lens
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from the image sensor with a twist of a control ring for close-up work—think of
it as a variable-length extension tube for macro work.
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and Micro Four Thirds system owners; they feature an optical element that
reduces the size of the lens’ image circle, giving it an angle of view close to what
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Tilt-shift adapters use the additional space between the lens and sensor to add
movements to your SLR lens, just like what you get with a dedicated Tilt-Shift
optic. They allow you to adjust the angle at which light hits the sensor, or to
correct perspective.