Why is f/1.8 called fast?

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AlphaTikal
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Why is f/1.8 called fast?
7 months ago

I don't get it. Why is a lens called fast, if the wide open aperture is meant? I mean, a lens can be fast, if the AutoFokus is fast.

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 AlphaTikal's gear list:AlphaTikal's gear list
Sony RX100 Sony SLT-A65 Sony DT 35mm F1.8 SAM Sony DT 16-50mm F2.8 SSM Tamron SP 90mm F2.8 Di VC USD 1:1 Macro +11 more
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