Quote: Thanks. What does constant maximum aperture mean?
Very many zoom lenses save on bulk and weight by allowing the maximum aperture to decrease as the lens is zoomed from short to longer focal length. If you're using a separate meter (quite rare these days) a lens whose max aperture varies as you zoom is a pain to use, because the smaller apertures vary as well. It hardly matters with TTL metering, but as you've seen, it is used as a descriptor when defining different versions of similar lenses. It doesn't necessarily indicate a lens with superior definition at all focal lengths.
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Re: What is the best lens for Minolta AF?
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