A Web Site for Photography Enthusiats

 

Selecting Your Interchangeable Lenses
   

Interchangeable Lenses \ Aperture/Speed of a Lens
Focal Length
Apertures
Angle of View
Perspective
Depth of Field
Subject and Shooting Distance

 

 
The maximum aperture of a lens is often referred to as the "speed" of a lens. An f/2 lens, for example, is said to be "faster" than an f/4 lens since faster shutter speeds are usually used at larger lens openings.
The aperture, in conjunction with the shutter speed, functions to adjust the exposure by regulating the amount of light allowed in to expose the film. The larger the maximum aperture or the faster the lens speed, the more the light allowed in and the more the possibility of shooting subjects without flash in dimmer conditions. When the aperture is reduced by one f/stop, the amount of light let in is halved. Using an aperture of f:1.4 as the standard, the following reductions of light take place, and the shutter speed slow down.


Lens Aperture f:1.4 f:2 f:2.8 f:4 f:5.6 f:8 f:11 f:16
Amount of Light 1 1/2 1/4 1/8 1/16 1/32 1/64 1/128
Shutter Speed 1/1000 /1500 1/250 1/125 1/60 1/30 1/15 1/8

 

Diaphragm
f:1.4 f:2 f:2.8 f:4 f:5.6 f:8 f:11 f:16

 
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