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Originally Posted by formica
no because it reduces the focal length, and sometimes you want a wide focal length, and for very bright situations, you may need a slower shutter speed for eg to take action shots to show up movement
allot of lens come with a wide range in a single lens, so its less restrictive i guess, its at the extreme ends of photography where it becomes important, very dark/very bright, extreme macro/wide landscape etc etc
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Focal length is not affected by aperture... All aperture does is control depth of field. You can get low end lenses that have a maximum aperture of 5.6 but have a focal length of 200mm and you can get 200mm lenses that have a maximum aperture of 2.8.
In bright situations you want faster shutter speeds to control your exposure if your not going to close your lens aperture down - which will change your depth of field. You will blow out the image if you don't.
@Mikoh
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Why would people just get a lens that will limit them in aperature size? In other words why even get a lens that is not the smallest f number?
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The reasoning is simple.... the bigger the maximum aperture the bigger the price tag.
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