Photography involves more math than many people expect, and not everyone is comfortable with the calculations. Fortunately, there are tools that make the process much simpler. One example is the LensMath Speed Booster Effective Aperture Calculator, a free utility that quickly determines a lens’s effective aperture, using the f-number multiplied by the booster ratio, as well as the full-frame equivalent focal length, calculated from the focal length, ratio, and crop factor. Useful and convenient.
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