"The lenses that are supplied with modern DSLRs use automatic iris. This means the lens is normally 'wide open' to let the maximum amount of light through to the viewfinder making it easier for you to see your composition. When you click the shutter release, the lens iris 'stops down', the shutter opens, after the set exposure time, the shutter closes and the lens iris opens up again.
Unfortunately the lens does not 'stop down' to exactly the same place each time you press the shutter. For normal picture taking this is not a problem, but for animation it causes an annoying flicker.
To solve this problem, the best solution is to use older style manual iris lenses, not to use the lenses that usually come bundled with the new DSLR cameras. The lens on this page is a manual iris/aperture lens. You can tell by the aperture "f-stop" markings on the movable ring on the lens barrel. Look for this stepping ring with similarly marked increments when considering a lens."
To avoid this problem, I found some old lenses for a film SLR that I had at home, and bought a cheap adapter. Now I have a manual 28mm prime lens mounted onto my SLR, so I should have no light flicker.
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