NPhoto - - Special Feature -

Your cam­era’s ISO set­ting de­ter­mines how sen­si­tive the sen­sor is to light. It acts a bit like the gain con­trol on a gui­tar am­pli­fier, boost­ing the strength of a weak sig­nal. As a re­sult, it can en­able you to take pic­tures when light lev­els are low (a weak sig­nal) and you can’t (or don’t want to) use a larger aper­ture or a slower shut­ter speed to make a us­able ex­po­sure. The down­side to in­creas­ing the ISO is the same as turn­ing the gain con­trol on an amp: more ‘noise’. Nikon D-SLRs typ­i­cally have an ISO range that runs from ISO100 to 6400, with a num­ber of ‘Hi’ set­tings. For the most part you’ll want to stick with lower sen­si­tiv­i­ties of ISO100 to ISO800 for the ‘clean­est’ pic­tures, as the higher sen­si­tiv­i­ties will look grainy and be cov­ered by coloured speck­les. You can in­crease the noise re­duc­tion (Shoot­ing Menu>High ISO NR) to com­bat this, al­though this will also smudge fine de­tails.





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