Film speed and shutter speed
The slower the film -- that is, the lower the ISO rating -- the longer the shutter must stay open at a particular aperture (F-stop). In low light with slow film, the shutter may have to stay open too long for the camera to be hand-held without noticeable camera shake, even with cameras with optical image stabilization.
First answer by Schnazola. Last edit by Schnazola. Contributor trust: 1126 [recommend contributor]. Question popularity: 48 [recommend question]
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