How do you work out the cor­rect ISO set­ting to use for any given sub­ject?

NPhoto - - Niko Pedia -

Lawrence Bas­sett, via email

Ja­son says... The base ISO set­ting in the cam­era’s stan­dard range typ­i­cally en­ables the best im­age qual­ity, with the great­est sharp­ness and dy­namic range, along with the min­i­mum im­age noise. A lower ‘ex­panded’ ISO set­ting may be avail­able but this is likely to re­duce dy­namic range. Even so, you can use this if you want to use a wide aper­ture and the light­ing con­di­tions are too bright to avoid over-ex­po­sure.

It’s more likely that you’ll need to in­crease your ISO un­der dull light­ing con­di­tions, in or­der to get a suf­fi­ciently fast shut­ter speed to avoid mo­tion blur. It’s worth the sac­ri­fice of de­creased fine de­tail and in­creased noise. The Auto ISO set­ting in Nikon cam­eras works well, in­creas­ing the ISO by the nec­es­sary amount to en­sure op­ti­mum im­age qual­ity.

The Auto ISO set­ting works well in dull or in­door con­di­tions, main­tain­ing suf­fi­ciently fast shut­ter speeds for hand­held shoot­ing

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