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Bobby -- Well, yes, a long time ago, like in the early 60s (and used into and 70s), most macro and close-up lenses were optimized for copy work -- close up flat field, and weren't so great for general shooting.
But since then, the rule has been sharp from close-up to infinity. Outstanding examples from the 70s are the Nikon AI 55/3.5 and the Canon FD 50/3.5 -- among others. These days, if you want stellar results at all distances, look to lenses like Canon 100L and Nikon's 105, again, among many others.
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Thanks for clarifying this, Jim. I have just exposed my age, haven't I? I wanted to say John Shaw books but some younger folks will wondering who the hell is John Shaw. Yup, I am still harboring some old school theories. I guess with the newer floating element macro lenses you get sharpness right up to infinity.