Rotating

Challenge #18 in the Subjects from A-Z series. Hosted by Oren Sarid.
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In this challenge you're requested to take pictures of rotating things, in a way that the rotation is visible in the picture (unless it is very very very slow and you can't capture it even with a really long exposure).
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Echoplex
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A continuous-loop tape cartridge in a partially-disassembled Echoplex EP-3 tape echo. Taken right after it started spinning again. The flywheel shaft had rusted and needed to be cleaned and adjusted. The record light can be seen illuminated in the bottom right-hand corner, though the motion of the tape itself is very difficult to make out.
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Submitted: Friday, 26th February, 2010 17:49 (GMT)
Taken: Sunday, 21st February, 2010
Focal length: 150 mm
Shutter speed: 1/40 sec
Aperture: F4
ISO: 1600
Notes: Hand-held and taken in available light while working on the Echoplex.
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