Archived posting to the Leica Users Group, 2000/09/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]It is a very clever design. Note the first element on the "conventional" lens design - a parallel protective glass. Much like a UV filter. Technologically, well within the realm of "yeah, it can be done" - but likely very difficult to bring the costs within control. I wonder what the price would be. (Ever wonder if it really costs 3x more to make a Noctilux than it does to make a Summicron?) By the way, my UV filter paid for itself yesterday - I put a lens "face down" on a rock without noticing that I didn't have the lens cap on. Not a scratch, but I aged about a decade. Vick Larry Kopitnik wrote: > Canon has posted to their web site a description of a new kind (new > to interchangeable lens camera use, anyway) of optical element, which > they call a "multi-layer diffractive optical element." They say it > offers superior correction of chromatic aberrations and allows them > to design telephoto lenses substantially smaller and lighter. They > describe a 400 mm lens they will show at Photokina incorporating the > element. > > The full description is at http://www.canon.com/do-info/index.html > > I know nothing more than what is on that web page, but to someone who > knows little about optical desing (like me!) it looks impressive. > Does anyone better versed in optical design (Erwin?) see a downside > to incorporating such an element in a lens design? > > Larry