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I was told by somebody with extensive experience using Canon equipment for astronomy the 100mm macro was THE sharpest canon lens for astrophotography. I am not so sure about this - sharp yes - but sharpest maybe not. One thing I don't like about the macro is the length and weight are more than the equivalent telephoto. It is heavy enough that addition support should be considered for mounting the lens.
If I were to do it again I might have gone for the 85 f1.8 or 100 f2 tele.
Terry
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