1) The diaphragm controls the aperture by increasing and decreasing the diameter of the lens opening. This also controls the depth of the picture and can be focused on an object close or far away.
2) The lower the focal length the greater the aperture which lets more light in. This would make the picture darker due to over exposure. and vice-versa.
3) And I think I sort of get the whole narrow aperture-slow shutter speed, wide aperture-fast shutter speed thing...
I also experimented with shutter speed a bit, setting my aperture higher or lower than it told me to.
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