Learning Photography
Out of context: Reply #20
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Lenses:
Every lens has two numbers:
1. how wide it is in "mm"- say 24-70mm - meaning it can be zoomed from wide (24) to mid range (70);
2. f-stop - say 2.8-4 - menaing it can go (depending on your zoom level) from f2.8 to f4F-stops:
the lower the f-stop - the more light the lens passes through - f2.8 passes more light than f4
******************************Exposure:
Exposure is controlled by 3 factors:
1. ISO - camera's sensitivity to light - say 160, 250, 500, 1000, 3200... The lover the number the less sensitive the camera will be BUT also you will see less noise/grain in the image.
2. Shutter - say 1/50, 1/100, 1/500... - the smaller the number the longer the shutter will be open - meaning more light will get in. SO if you are in dark situation you go with low shutter (say 1/50). When you go with very low shutter ( say 1/15) the images get blurry but you need less light to get the image.
3. Len's f-stop (see point 2 in lens section).That's all there is. Now go experiment.
And for theory posts about meaning of photography, you can check out my blog: http://swlthemovie.com/blog