Cam­era skills ISO and flash

Ad­just the sen­si­tiv­ity for more bal­anced shots

Digital Camera World - - CAMERA COLLEGE -

Be­ing able to ad­just the ISO is use­ful for flash pho­tog­ra­phy. When it comes to get­ting a good flash ex­po­sure, the choice of aper­ture is key, as it’s this that con­trols how much light reaches the dig­i­tal sen­sor.

Be­cause the flash fires so quickly, the shut­ter speed doesn’t af­fect the flash ex­po­sure, but it does con­trol how much am­bi­ent light is also cap­tured in the photo. If you’re shooting in low light, the shut­ter speed may be so slow that you can’t hold the cam­era steady dur­ing the ex­po­sure – and you’ll end up with a blend of sharp bits (lit by the flash) and blurred bits (cap­tured dur­ing the long ex­po­sure time). The so­lu­tion is to set the shut­ter speed to the flash’s fastest sync set­ting (usu­ally 1/200-1/250 sec), then choose a higher ISO set­ting to cap­ture the am­bi­ent light dur­ing the shorter ex­po­sure. The re­sult is a sharp pic­ture that shows a good bal­ance be­tween the flash-lit sub­ject and the back­ground.

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