if you set it while at a wide angle zoom setting, to min. like 2.8, then zoom out it will increase, like most zooms, then when you zoom back in to wide, you may need to re-set it to 2.8 again.
Only a few p&s's have constant aperture zooms, one that I have is a Panasonic Lumix that can retain f2.8 throughout the zoom range.
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