[Brightcolours]

  Hmm...  sounds just a tickle on the pricey side from where I'm standing, more appropriate to a F2.8!

 

The real good news is it's not that price at all, it's only a mere $2,899!..............

 

 

.....................................................an absolute snip!   :o

Well, it is not an f-number which "dictates" the price, but rather the amount of glass and the difficulty to produce that glass which sets the price of a lens.

This patent filing possibly shows how the 11-24mm f4 is constructed:

http://egami.blog.so-net.ne.jp/2014-01-25



This is what the lens itself looks like:

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Looking at that big and very curved front element, one can imagine where the money goes...