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I have this lens as Vivitar 100mm f2.8. It's a great, great lens and there is very little to complain about it optically. However, I find the long focusing throw (almost 2 turns) a mixed blessing. It's great when you are working slowly on tripod, but makes it difficult to focus quickly. Also an aperture ring is a bit too narrow for my taste. So, it's not perfect, but for the tripod work it's my top choice.
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