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I have read many comments that older lens “may not hold up” , “ not good enough glass” for the 24mp D7100. Realizing glass improves with technology and better glass may be needed to get the full benefit of the camera. Some of the reviews I read when deciding on the upgrade indicated one would need new good glass with the D7100. My limited experience has shown an improvement in performance of my 2004-2006 era lenses. Is it just my eye? I am not a professional and tend to lag behind in technology if what I have works for me....Show more →
My own observation is that the newer lenses (past ~10 years) have better flare resistance, better contrast, better saturation, faster autofocus, and some have VR. Lens elements are now ground by robots, which has made them more consistent and have finer tolerances. The aspherical and "exotic" elements have really reduced color fringing, especially with digital sensors. Just as camera technology has changed over the past 20 years, lenses have advanced just as much.
Kent in SD