I'm looking at the Sigma 135-400 DG lens as a possible upgrade option. It's about the same price as the Canon 70-300 IS, but it goes all the way to 400mm. I'm not terribly concerned about the lack of IS, because whenever I need a telephoto lens in low light, I'm on a tripod anyway. It's fairly small and light (compared to the Canon 100-400L, which I really am not a fan of due to size, or the Sigma 80-400 EX, which is like the 100-400L without USM). I'd primarily use this lens for plane-spotting.
This would be a great lens at the price if the image quality is acceptable. The guy at B&H told me it's similar to the Canon 70-300 IS, but I've heard mixed reviews. And it's hard to tell from reviews, because so many people use it wide open and complain about how soft it is, whereas people like us are quite satisfied at f/8.
Does anyone have this lens? Would you recommend it? Any better alternatives in the same price range (~$500)? Or should I just stick with the cheapo 70-300 until I can afford the 100-400L?
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