ASPHERICAL? HUH?

[Steve Parr]

I often see the word "aspherical" used in descriptions of wide angle lenses. I think I know what they're referring to, but could someone explain exactly what it is, and what the benefits of it are?

Thanks...

Steve

[HJMinard]

This page (http://www.canon.com/technology/detail/product_tech/mold/) on Canon's site has a decent explanation.

[Steve Parr]

Thanks, Gunny...

Steve