 joe Yuen |
F Number from digital camera I've recently begun my digital photography with a point and shoot compact camera (Lumix fx8). Looking at the data from the picutures confused me a lot. It had all kinds of weired numbers for the aperature (F number) and the shutter speed. for instance, something like F7.3, or F3.2 etc. for the F number. and 1/230, or 1/76 etc. for the shutter. is it how the digital camera works? I thought it would give the same kind of numbers from the regular flim cameras (F2.8, 5.6, 8....)
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Jon Close |
The progression of 1.4, 2, 2.8, 4, 5.6, 8, etc. is for "whole stops," where each step is doubles or halves the exposure. Manual lenses usually also had clicks inbetween for 1/2 or 1/3 stop steps. The electronic apertures on modern autoexposure cameras/lenses allow even finer exposure adjustments. f/3.2 is 1/3 stop smaller than f/2.8, f/7.3 is about 1/4 stop larger than f/8. Similar with shutter speed. Mechanical cameras usually had only full stop adjustments (1/1000, 1/500, 1/250, 1/125,...). Autoexposure cameras with electronically timed shutters can set virtually any fraction of a second.
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joe Yuen |
I see. Thanks a lot, Jon.
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