Bob lenses" : I just received the November 2009 issue of Digital Photo, formerly PC : Photo, and AKA dpmag.com. : : Here is the link to what they say about digital lenses...... : : http://www.dpmag.com/buyers-guide/lenses.html?start=1 "Every manufacturer has its own terminology to describe the top-notch optical qualities of the best glass and coatings of its lenses. These terms, like SD, LD, ED and APO, describe low-dispersion characteristics." that's what i'm talking about! an apo lens is neither new, nor a glass or coating.. it's as we all know, a lens shape "Benefit: Low-dispersion glass and coatings minimize aberrations—the kinds of color and sharpness problems that appear dramatically amplified when images are enlarged. Internal coated elements help stop flare, and front element coatings make the glass more scratch- and dust-resistant." uh-huh.. ore 'nothing-new-here' too :/ In fact, where are the thorium elements of yesteryear? "ASPHERICAL AND RECTILINEAR Aspherical lenses offer several advantages. First, they reduce spherical aberration as light passes through the lens, resulting in sharper images and reducing linear distortion in wide-angle lenses. The use of aspherical elements also allows lens designers to use fewer glass elements than they otherwise could for a given lens, making smaller and lighter lens designs possible. Rectilinear lens design makes wide angles appear more natural (and less distorted) by keeping straight lines from curving quite so noticeably." (..or at all in the case of some older lenses) again - nothing special :( k
