TECH SUPPORT Digital Optics Q.. I am currently using Sigma full-frame lenses on my Nikon D80 that I once used on my Nikon N80 film SLR—a 70–300mmm APO zoom purchased in 1996 and a 28–200mm zoom purchased in 2003. These lenses have served me very well over the years, and they take fine images on my D80. Now I’m wondering what improvements my images would show if I used the new comparable Sigma Digital lenses instead? A. The term “digital” refers to one of two things when applied to lenses: Those lenses designed to produce an image circle matched to smaller-than-full-frame sensors (Sigma DC), or full-framer lenses that have been optimized for digital imaging (Sigma DG). In either case, these optics most often have more and/or better coatings applied to the rear elements to reduce reflection off the sensor. In some cases their optical formulas may have been modified to make for more parallel travel of light rays to the sensor or film. In any event, over the past few years we’ve seen pretty consistent optical improvement in newer versions of lenses, but whether an increase to Very Good from Good at max tele would make a big difference is doubtful. What would make the biggest difference to your photography would be Optical Stabilization (OS), which will let you handhold at longer shutter speeds. Do you have Tech Support Question? Post it on our Facebook Page. |
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