Mike Raiford wrote:

> 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.

I bet a £7,000 lense is really, really heavy...

(I couldn't tell from the picture, but it looked like it was 30cm across 
or something!)

-- 
http://blog.orphi.me.uk/
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