« on: November 19, 2013, 06:09:19 AM »
Yep, a good read. Making a lens with very tight tolerances, with aspherics in the mix is very difficult (centering issues with aspheric lenses can be tricky). While Canon/Nikon do make fast optics in the 50mm range with aspherics / special glass, etc, they are soft wide open. This one isn'tHonest question. I don't get why a well made lens with half dozen machine ground lenses of a particular shape and in one configuration can cost 10-20x what another well made lens with a half dozen machine ground lenses of a similar shape and configuration? How can the shape of a lens element or the coating cost so much more to produce? What is special about this lens that Canon, Nikon or Sigma could not reverse engineer (i.e. lens shape) and produce for $400?
An interesting read from Lloyd Chambers here.
Remember the canon lenses are much older designs. Canon's more recent lens designs are much sharper, like the 100mm macro L.