the newer lens are designed properly to fit DSLR better than the older lens. The DSLR sensor is more sensitive to lighting than the old SLR film. The old lens when using on the conventional SLR camera may not reveal all flare and ghosting, unlike the old lens when using on the newer DSLR camera. In term of sharpness, old Nikon lens, even prime lens, aren't so sharp, comparing to recent Nikon Nano lens. The new lens are designed to be used on the new DSLR camera upto 30MP. In addition to that, color characteristics and lens vignet are also considerable. The newer lens are better designed than the older lens. You don't have to go for the expensive Nano lens, just some kit lens, such as 18-105mm lens. Good luck.
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