The ratio between the focal length and the aperture (diameter) of a lens is called the f/number. The smaller the f/number, the more light is let in. Fast lenses start around f/2.0, and the light let in goes as the inverse square. Compared to f/2.0, f /1.4 lets in twice as much light, f/1.0 four...
How to Use Ultra-Fast Lenses on Modern DSLR Cameras
Friday, August 2, 2013
How to Use Ultra-Fast Lenses on Modern DSLR Cameras
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