Stop the con­fu­sion

Digital Camera World - - PHOTO ACTIVE -

QI’m try­ing to un­der­stand aper­tures. I read about some be­ing a full stop and some not, but I’m con­fused… Sara Hard­cas­tle

AThe fol­low­ing cam­era aper­tures are all full stops: f/2.8, f/4, f/5.6, f/8. f/ll and f/16. Each of th­ese aper­tures (or stops) dou­bles or halves the amount of light get­ting through to the sen­sor com­pared with the ad­ja­cent stops. For in­stance, f/2.8 dou­bles the amount of light com­pared with f/4. How­ever, f/5.6 halves the amount of light com­pared with f/4. Your cam­era will also al­low you to change the ex­po­sure in half or third-stop in­cre­ments for finer con­trol over the ex­po­sures, but the aper­tures be­tween those listed above aren’t full stops. For ex­am­ple, if you started at f/2.8 and worked up to f/4 in third-stop in­cre­ments you would get f/2.8 (full stop), f/3.2, f/3.5 and f/4 (full stop). Th­ese set­tings can vary be­tween cam­eras.

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