On 5/4/2010 1:50 PM, Darren New wrote:

> The lens, however, lets you take pictures you wouldn't otherwise be able
> to take. Even a small quality change in the lens adds or removes an hour
> each day that you can take natural light pictures, or pictures that
> aren't motion-blurred, or etc.

Right. The bigger the aperture, the more glass (And in high-end lenses 
it's exotic glass with exotic coatings) ergo, the more cost.

Remember, the glass has to be a special type (and in most lenses, there 
are a couple different types of glass being used) to eliminate 
dispersion effects. Also, its expensive to grind some of the profiles on 
the glass to counter geometrical distortions. Again, adding to the price 
tag.

-- 
~Mike

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