"Don Sanderson" <[EMAIL PROTECTED]> wrote: >To the best of my knowledge both the Sigma DG and Tamron Di >lenses are full frame 35mm.
Right, but the Sigma EX 18-50mm f/2.8 DC isn't one of the "DG" lenses. The "DC" lenses *are* APS digital only. >They are in some way "optimised" for digital. >This is a quote from the description of the 17-35 EX DG: > >"The design concept of this lens is especially suitable >for the characteristics of Digital SLR Cameras." > >Exactly what this means to 35mm users I don't know, Many people, including Herb Keppler at Pop Photo (in an unusual slight to the all-important advertisers!) believe it's mostly marketing. They claim to have improved coatings and otherwise changed the design of the lenses to minimize internal reflections so as to prevent flare and ghosting from light reflected off the sensor. >however I will soon as I have ordered the Tamron >Di 28-75/2.8 for use on both the D and film 35s. I'll be ordering mine today or tomorrow. :) -- Mark Roberts Photography and writing www.robertstech.com
