set ting the RIGHT expo sure

A round-up of sug­gested cam­era set­tings for pop­u­lar sub­jects

Digital Camera World - - BACK TO BASICS -

ALTHO UGH ex­po­sure is a flex­i­ble thing, there are op­ti­mum set­tings for spe­cific

sub­jects. For ex­am­ple, land­scape im­ages typ­i­cally re­quire small aper­tures to get ev­ery­thing sharp from fore­ground to hori­zon. As you can see above, this can re­quire a fairly slow shut­ter speed when the sen­si­tiv­ity is set to ISO 100. If you’re shoot­ing with­out the aid of a tri­pod or im­age sta­bilised lenses, the ex­po­sure might be too slow to hold the cam­era steady and get sharp pic­tures, in which case you can in­crease the ISO.

At the other ex­treme, pho­tograph­ing ac­tive wildlife, par­tic­u­larly birds in flight, can re­quire very fast shut­ter speeds. At ISO 100, this might re­sult in hav­ing to use the max­i­mum (widest) aper­ture on the lens. The max­i­mum aper­ture on your lens might not be wide enough to achieve the nec­es­sary shut­ter speed, in which case you’ll need to in­crease the ISO. One thing to bear in mind is that you’ll make ad­just­ments in EV val­ues, or stops: if you in­crease one of the three ex­po­sure con­trols by one stop (tak­ing ISO from 100 to 200, say), you need to de­crease one of the other con­trols (shut­ter speed or aper­ture in our case) by one stop – or a com­bi­na­tion of both, as long as it adds up to one full stop – in or­der to main­tain the same over­all level of ex­po­sure.

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