I routinely shoot my 300/3.8L II plus 2x III hand held, so the Sigma (S version) which is just a fraction heavier would certainly be possible. And for less than a third of the price who wouldn't give it serious consideration!? It may even focus faster without the handicap of the Extender.TWI by Dustin Abbott said:I think a discussion of the 150-600 VC remains very germane to this topic. A decision between these two lenses is still the biggest one for most Canon tele shooters on a budget. The Sigma (which should be on its way to me shortly), is reportedly quite excellent optically, but is a true beast in terms of size and weight. Not many people are reporting much interest in shooting it handheld.
Based on what I've learned from two friends who have/had the Tamron (one has returned it), the optics are very good but AF in AI Servo mode is not very good making it a disappointing lens for BIFs etc. Very good for static shots where maximum reach is needed though.
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