I’m in a photo 1 class and talking about the program mode and flexible programming is confusing. If changing one setting changes the others to meet it, how is anything changing?
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Each of the three settings – shutter speed, aperture and ISO – control how much light gets in. If you increase one of them, you need to decrease one of the other to compensate, and vice versa.
However, each one also has a side effect. Faster shutter speed means it takes less time to take the photo, so if you want to shoot something moving, you should use faster shutter speed (unless you want to capture the motion blur). Larger aperture means ~~smaller focal length~~ shallower field depth, so you can get shots where a small part of the photo is in focus and the rest is blurred (good for portrait shots, for example). On the other hand, smaller aperture means more of the photo will be in focus (good for landscapes). Higher ISO means the photo is noisier, so normally you would want to avoid that.
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