> Hmm, well, if the diameter is more than twice as big, that's more than > _four_ times as much glass, even if the thickness doesn't increase, so > realistically 6 to 8 times as much. > > If you're looking at the specs, you could consider price per gram of > glass?? > > Brian The biggest factor determining the price of lenses overall is not aperture but brand name. Manufacturing costs only determine whether a company can afford to produce the lens at all for a price people will pay. Sigma vs Canon vs Nikon vs Leica ... What people will pay is one of those great mysteries. It seems at about this time of year the price structure gets turned on head because Santa seems to choose things that are normally considered extravagant. Bob PS ... poor old Andy got a new lawn mower and couldn't wait for the snow to melt to try it out ;o) http://www.rit.edu/~andpph/gallery2002/pages/davidhazy.html
