photography
Out of context: Reply #7
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- rafalski0
what the guys said, but..
a picture is an equation, where time and light delivered are balanced. Give it too long, or aperture hole open too wide, and you have an overblown image. Too short or the aperture blades closed too tight, and the picture is too dark - underexposed.
It's simple, but then time and aperture have more to them. The longer the time, the blurrier moving objects become, or you even catch camera movement.
Aperture is a tricky one, as it is responsible for the depth of field (dof). The faster the aperture (meaning, lower f value and bigger hole), the shallower dof you get - this allows you to isolate a single focal plane, blurring the rest. Slower aperture (tighter hole, higher f) means bigger dof, resulting in bigger range of focal planes being in focus.
forcetwelve suggests you want high aperture, but I'd say low aperture value brings more interesting results, letting you concentrate on detail.
More on dof: http://en.wikipedia.org/wiki/Dep…Then there is ISO, that is sensitivity. It adds to the equation - the higher the iso, the more light coming to the sensor. It allows you to shoot in the dark, shortening the time needed for a picture, without motion blur.
Just as with time and aperture, there is a byproduct, and this time it's neither motion blur nor dof - it's grain. Higher ISO gives you noise. In some cameras ISO 400 is unacceptably noisy, in my opinion Canon dslr sensors handle noise best.