Fast lens

Photo Plus - - A-Z Guide -

A lens that has a wider max­i­mum aper­ture than is usual for that par­tic­u­lar fo­cal length or zoom range (such as a Canon EF 50mm f/1.8 lens), al­low­ing a shorter shut­ter speed. Fast lenses are not only use­ful in low light, by us­ing a larger aper­ture they can be in­valu­able for throw­ing back­grounds out of fo­cus to a greater ex­tent than usual.

Over­all light or dark sub­jects (which can some­times fool the cam­era’s me­ter­ing sys­tem) can be man­u­ally cor­rected by us­ing ex­po­sure com­pen­sa­tion set­tings man­u­ally ad­justed in frac­tional f-stops +1 Stop ev


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