often times these have much to do with the aperture itself, but is to guide the autofocus.. in macro mode, the autofocus is only in the enar range, in snapshot mode is in the typical 1.5-2.5 meter range.. and on landscape, the autofocus is locked to infinity.. no matter what aperture you're using.. i'm talking of course in manual modes.. In more automatic modes, the landscape option might force a smaller aperture (f5.6+) and maybe the macro mode will force a larger aperture (f2?) but when you're in manual mode, it's all up to you.. FOr a landscape, i think i read somewhere that a 5.6 aperture is the sharpest.. for any other situation though, you can pretty much use any value toget the effect you want.. Those macro, landscape, etc modes are only for your focusing.
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