I really like one that are about 20-30 seconds long (which need a better camera, a tripod, and a neutral-density filter).
Why a neutral-density filter?
Let's say a correct exposure for the image (say, in moderate shade) would be 1/60 second at f/2.8 at your preferred ISO level.
1800 times less light through the lens would correspond to about 11 f-stops, which would be f/128.
My camera doesn't do f/128 (and damned few do — mainly giant view cameras).
Even if I lower the ISO value to the minimum, I couldn't close the lens down enough to get the proper exposure for a 30-second shutter.
Neutral-density filters can reduce the light passing through the lens by anywhere from 1 to 16 f-stops.
They can also let you use a larger aperture (with shallower depth of field) if that is appropriate for your subject.
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Posted by: James Saklad <jimdoc@icloud.com>
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