I was wondering the same thing. I read through the whole user manual - it only says what and how BUT NOT WHY.
I have since found out in Auto modes such as P, Macro you can use PROGRAM SHIFT to select your own aparture.
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Nikon D90, D80
[[Nikkor 16-85mm AF-S DX F/3.5-5.6G ED VR, Nikkor 70-300mm AF F/4.0-5.6G, Sigma 18-50mm F/2.8 EX DC Macro, Sigma 105mm F2.8 EX DG Macro]] || [[2x SB800, SB24]] || [[Manfrotto 190XB]]
Fuji FinePix F30
Old training camera: Panasonic Lumix DMC FZ20
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