Samsung NX1000 User Manual page 16

The see }f the apeRure _srepresented D, a vaue known as an
"F-number_" The ?number represents _ne focal length dMded o? _ne
diameter of the lens. For exarr pie, if a lens Nlth a 50 mm focal Ieng_n
has an f-number of F2 the d_ameter of the aperture _s25 ram.
,50 ram/25 ram-F2 The smaller the f-number. _ne grea_er _ne size of
_ne aoerve.
The opening _n_ne apeRure is described as the Exposure va_ue (EV/.
ncreasing _ne Exposure Value __1 EVt means _ne amoun_ of light
doubles. Decreasing tne Exposure Value
t-1
EVt means _ne amoun_ ol
_ght halves. You can a_so Jse _ne exposure corrpensat_or feature _o
fine-_une _ne amoun_ of _ght by subdM@ng exposure values into 1/2.
"/3 F\. and so on
±1 EV -" k_V
F2 b2.8 F4 F5.6 F8
Exposure Value Steps
You can blur or sharpen
aperve. It _sclosely related to the depth of 1
expressed as small or large.
9nolo wl_n a large DOF A photo with a small DOF