Not us­ing the op­ti­mum aper­ture

NPhoto - - Special Feature -

Although there will be sit­u­a­tions when you want to use a large aper­ture to help you sep­a­rate a sharp sub­ject from a blurred back­ground, there will be other times when you want more of a scene to ap­pear sharply fo­cused. It might be tempt­ing to reach for the small­est aper­ture on the lens, but this ac­tu­ally leads to softer pic­tures due to the ef­fects of diffrac­tion – es­sen­tially in­com­ing light rays be­ing bent out of shape by the aper­ture blades, which is more no­tice­able at small aper­tures.

It’s of­ten prefer­able to sac­ri­fice some depth of field in or­der to de­liver an im­age where de­tails are pin-sharp. This is of­ten in the mid­dle of a lens’s aper­ture range – typ­i­cally around f/8 to f/11, although this varies from lens to lens.

An aper­ture of f/22 may not give bit­ingly sharp re­sults thanks to the ef­fects of diffrac­tion, whereas an aper­ture of f/5.6 may not of­fer enough depth of field for a scenic shot



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