A recent post has prompted me to ask this? I heard once that Cannon has a patent on an aspherical grinding process that impeeds Nikkor from producing relatively inexpensive asphericals. Has anyone else heard about this?
Please note: I love my Nikkors. I love my Nikon. I've never owned a Cannon. I'm not trashing anyones cameras. DON't flame me!
"The faster you go, the shorter you are." — Albert Einstein about Relativity.
#1. "RE: Cannon aspherical patent?" | In response to Reply # 0f5fstop Basic MemberWed 18-Sep-02 10:05 PM
I see no reason why anyone would flame you for this message, it is a straight forward question.
The question is interesting and I do not have any idea if Canon has a patent on manufacture of inexpensive aspherical lens; however, I do know from an article I have on my desk, from a Nikon brochure, that Nikon did in fact, introduce the first aspherical photographic lens elements. To quote parts of the information:
"Nikon introduced the first photographic lens with aspherical lens elements in 1968 and continues to expand the application for this technology today. Aspherical lenses minimize the problem of coma and other types of lens distortion - even when used at the widest aperture. They are particularly useful in correcting the distortion in wide-angle lenses. In addition, use of aspherical lenses contributes to a lighter and smaller lens design."
"Nikon employs three types of aspherical lens elements. Precision-ground aspherical lens elements are the finest expression of lens crafting art, demanding extremely rigorous production standards. They are featured on wide-angle lenses such as the AF Nikkor 28mm F/1.4D, or AF Zoom Nikkor 20-35mm F/2.8D. Hybrid aspherical lenses are made with a special optical resin molded onto optical glass and are used in several Nikkor zoom lenses. Molded glass aspherical lenses are manufactured by molding a unique type of optical glass using a special metal die technique. AF Nikkor lenses like the 18mm F/2.8D, 24-120 F/3.5-5.6D and 28-200mm F/3.5-5.6D employ this type of lens element."
(Information quoted from Nikon Lens Advertisement Brochure, dated 1998; therefore, the information on which lenses utilize the different aspherical lens elements is outdated.)
So, does Canon manufacture inexpensive aspherical lens elements? That, I can believe. Whether or not Nikon cannot use this inexpensive process maybe true; however, the question now is, does Nikon want to use this inexpensive method, and is it any better than the inexpensive method Nikon currently uses?
"Take only photographs, leave only footprints"