In­crease the ISO

NPhoto - - Sharpen Up Your Slr Skills -

When it comes to ex­po­sure set­tings, the lim­it­ing fac­tor is usu­ally aper­ture choice. Lenses have a fixed range of aper­tures and when you’re shoot­ing in low light con­di­tions you may not be able to open the aper­ture wide enough to let enough light into the cam­era to achieve rapid, ac­tion-stop­ping shut­ter speeds. This is where the ad­justable ISO set­ting comes into its own. By in­creas­ing the ISO, you essen­tially turn up the vol­ume on the sen­sor, am­pli­fy­ing the sig­nal (light, in our case) so that an im­age is formed with less avail­able light. The drawback is in­creased noise, fewer fine de­tails and a colour shift, al­though Nikon cam­eras are renowned for their high ISO per­for­mance and you’re un­likely to suf­fer any real im­age degra­da­tion be­low ISO6400.

You can change the ISO man­u­ally be­tween shots, but why not try us­ing your cam­era’s Auto ISO func­tion? Here, the cam­era will au­to­mat­i­cally ad­just the ISO up to a max­i­mum sen­si­tiv­ity that you’ve pre­s­e­lected. It works sur­pris­ingly well when you’re shoot­ing in man­ual ex­po­sure mode: you can set your pre­ferred com­bi­na­tion of shut­ter speed and aper­ture and the cam­era will choose the ISO that will de­liver the best ex­po­sure, ac­cord­ing to its me­ter read­ing. It’s a fast way of work­ing, par­tic­u­larly in low light con­di­tions.

Newspapers in English

Newspapers from Australia

© PressReader. All rights reserved.