Auto ISO

Don’t dis­miss this au­to­mated fea­ture – it can save your bacon when you need to shoot quickly

Digital Camera World - - CAMERA COLLEGE -

In or­der to select the ISO sen­si­tiv­ity of your choice, you need to be us­ing one of your cam­era’s more ad­vanced shooting modes. Even then, you can select the Auto op­tion in the ISO menu to let the cam­era han­dle the sen­si­tiv­ity. Here, the cam­era will set an ISO that will give a rea­son­ably fast ex­po­sure for the light­ing con­di­tions.

Auto ISO is a use­ful op­tion when you’re mov­ing from out­door to in­door lo­ca­tions and don’t have time to change the ISO man­u­ally. It can also turn Man­ual mode into a com­bi­na­tion of Aper­ture Pri­or­ity and Shut­ter Pri­or­ity: once you select your pre­ferred com­bi­na­tion of aper­ture and shut­ter speed, the cam­era will do its best to main­tain a con­sis­tent ex­po­sure by ad­just­ing the ISO.

When you’re shooting in low light, there is a risk that the cam­era will select an ISO that’s too high, lead­ing to noisy pictures. But you may be able to re­duce the ISO range avail­able to the cam­era.

MAX HEAD­ROOM Take some test shots to de­ter­mine the ISO at which im­age qual­ity be­comes un­ac­cept­able, then use that as a guide to the Auto ISO limit.

FUR­THER OP­TIONS Some cam­eras let you re­duce or ex­pand the nor­mal ISO range, and even set a min­i­mum shut­ter speed that Auto ISO will at­tempt to main­tain.

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