Why your 500mm lens cost so much...

[UncleFai]

http://www.youtube.com/watch?v=ovxtgj4SsiI

Enjoy!

 

[diver-hloc]

Never suspected that they treat the raw, unpolished glass like metal by a blacksmith... heating and molding the glass into shape by using a giant metal press.... :sweat:

 

[area0404]

Just imagine how many fingers are cut to make a lens for you! XD

 

[Blur Shadow]

Interesting!

 

[clov3r]

They actually annealed the glass to remove the stresses, very interesting. I only know that they do that to metals.