Ex­plained: dif­frac­tion

NPhoto - - Feature -

Why you should avoid high f-num­bers When you’re shoot­ing a land­scape (or any other sub­ject) where you want to get as much of it to look as sharp as pos­si­ble, you may be tempted to dial in your lens’s small­est aper­ture to ex­tend the depth of field (see the next page to learn more about this). How­ever, it’s best to avoid the high­est f-num­bers, as this will ac­tu­ally re­duce over­all sharp­ness, due to an op­ti­cal phe­nom­e­non known as dif­frac­tion – f/13 or f/16 is usu­ally a good com­pro­mise. All lenses suf­fer from this, in­clud­ing pro lenses cost­ing thou­sands.

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