9_ISO

The qual­ity of images taken at high ISOs on cur­rent cam­eras means you can now shoot even when the light lev­els are low…

NPhoto - - 10 Things To Master -

ISO is sim­ply a mea­sure of how sen­si­tive your cam­era’s sen­sor is to light – at high ISO set­tings, such as 800 or 1600, the sen­sor needs less light to pro­vide a cor­rect ex­po­sure. If you don’t in­crease the ISO in low light, a shut­ter speed fast enough to shoot hand­held might not let in enough light for a cor­rect ex­po­sure – in­creas­ing the ISO makes the sen­sor more sen­si­tive, so the limited amount of light pro­vided by the fast shut­ter speed (in other words, a short ex­po­sure) should be enough for a cor­rect ex­po­sure. a faster shut­ter speed – per­fect for avoid­ing both cam­era shake and blur due to sub­ject move­ment. How­ever, de­spite th­ese ad­vances, there is still some drop-off in qual­ity as you in­crease the ISO, so you should try to keep the ISO at the low­est set­ting that will still al­low you to get the shot. When you’re shoot­ing in low light but want to use a fast shut­ter speed, set your SLR to shut­ter-pri­or­ity mode to al­low you to choose the shut­ter speed you need to freeze any move­ment. Now point your cam­era to­wards your sub­ject and check whether the aper­ture dis­play is con­stantly lit or flash­ing. If it’s con­stantly lit there’s enough light to start shoot­ing, but if it’s flash­ing then you need to in­crease the ISO un­til it’s con­stant. Flash­ing in­di­cates that the cam­era can­not achieve a cor­rect ex­po­sure for the light­ing con­di­tions, but re­mem­ber that if the light changes or the sub­ject moves into a darker lo­ca­tion, you’ll need to watch out for the flash­ing aper­ture dis­play again, and change the ISO to com­pen­sate. Most Nikon SLRs of­fer a range of ISO set­tings above the ‘na­tive’ high­est val­ues. Th­ese are known as ‘ex­panded ISO set­tings’. Th­ese are best avoided in all but the most ex­treme shoot­ing con­di­tions, as along with in­creased noise, which shows up in the form of speck­les on your pho­to­graphs, us­ing th­ese set­tings can also lead to a greater risk of blown high­lights and blocked-out shad­ows, as they of­ten have a lower dy­namic range than the nor­mal ISO set­tings.

White bal­ance is es­sen­tially a way of en­sur­ing that whites ac­tu­ally look white in your images

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