Well after a couple of weeks of deliberation, I'm also considering buying a new lens. I was wondering if the Sigma would be a better purchase then a Canon 75-300MM F/4-5.6 III USM lens that I can get used for 200$? And also, is a mirror lens a good investment, I keep finding them at extremely low prices (especially the Opteka lenses which start at 75$ on Ebay)?
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