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The Sigma 100-300 f/4 is an unusual tele zoom: unlike the majority of other tele-zooms in its price range, it has a constant maximum aperture of f/4. It is cheaper than Canon 100-400 and 300 f/4, and it is not much bigger, in spite of the aperture and internal zoom. I had heard very positive opinions about its image quality, so I have decided to compare it against the Canon 100-400 and the Canon 300 f/4 IS. How does these lenses compare, with and without teleconverters?