b] APER­TURE

NPhoto - - Special Feature -

The aper­ture is the open­ing in a lens, formed by a se­ries of blades. As the aper­ture set­ting is al­tered on the cam­era, th­ese blades open and close to reg­u­late the quan­tity of light. A large aper­ture lets more light in, so the sen­sor only needs to be ex­posed for a com­par­a­tively short time in or­der to record a pic­ture. A smaller aper­ture re­duces the amount of light let in, so the sen­sor will need to be ex­posed for longer. The aper­ture size is listed in f-num­bers, and con­fus­ingly, the small­est f-num­bers cor­re­spond with the big­gest holes – an aper­ture of f/1.4 is much larger than an aper­ture of f/22, for in­stance. If makes more sense if you think about it in terms of frac­tions, as 1/4 is larger than 1/22.

f/32 – deep depth of field A large aper­ture gives a nar­row band of sharp­ness, while a small aper­ture gives a rel­a­tively ex­ten­sive one. How­ever, a lens gen­er­ally gives the sharpest re­sults some­where in the mid­dle of its aper­ture range, which is of­ten an aper­ture of f/8

f/4.5 – shal­low depth of field

Newspapers in English

Newspapers from Australia

© PressReader. All rights reserved.