F Numbers: The bigger the number, the smaller the hole. The smaller the number, the larger the hole. Big hole means not of specific focus in the picture, if there is a small hole means focus is on one part of the photo then the rest of the photograph with be blury.
Shutter Speed 15 (Slow) ------------> 1000 (Fast)
Shutter speed affects the picture being taken quite alot, if you're wanting a sharp image, maybe of moving objects you'll use a fast shutter speed, but if you're wanting movement in your photo, for example; painting with light you'll use a slow shutter speed :)
ISO; Depending on how much light there is, a bright location needs a low ISO, where as a dark location needs a high ISO, because it needs to be sensative to the light in the photo
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