What is a st op?

NPhoto - - Nikon Skills -

A lot of ref­er­ences are made to ‘stops’ with ND grads and NDs. A ‘stop’ equates to a change in ei­ther the shut­ter speed, aper­ture or ISO, and de­notes halv­ing or dou­bling of light lev­els. If you halve the shut­ter speed (go­ing from 1/60 to 1/30 sec, for ex­am­ple), that equates to a stop. Most D-SLRs will al­low smaller in­cre­ments, so you may need to move the dial two or three ‘clicks’ be­fore achiev­ing a full stop.

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