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Message: <blockquote data-quote="J-see" data-source="post: 434407" data-attributes="member: 31330">As far as I know a fast lens can do everything a slow lens does... and more but the opposite is not true. That doesn't imply the only difference between two 50mm will be the aperture since they can both differ at about every level just as much as two 1.4 lenses can differ. And they'll behave different too depending upon which cam used.But personally I see no reason to buy a 1.8 if I already have a 1.4. Maybe a specific lens can have other qualities someone prefers for certain shots. That I would not know. But I doubt they buy it because it performs just a bit less during low light.</blockquote>