I must confess, I am curious about this lens. Like many, I am a bit uncertain given the announced "rock bottom" price. On the other hand, Sigma has managed to create an amazing lens in its 120-300 2.8 Sport, for a price that is well under what its closest Canon and Nikon competitors cost. And no, I'm not saying I expect this lens to match the 120-300 optically while costing less than half its price. What I am saying though, it's possible for a company to create a lens that "punches above its price point." Only time (and some solid reviews) will tell. It'd be awesome if it can match (or better yet, exceed) the IQ of the Canon 100-400L. Not that I'd expect it to match the new version 2 that is rumoured to be replacing that lens, but aiming at a the nearly 14 year old current model might be "doable," -- perhaps even at this price-point. Still, I expected this to be more expensive--like 3 grand or so, when I first saw the announcement. It will be far less interesting if it is only the same IQ as the Sigma 150-500 or 50-500, both of which are reputed to be optically inferior to the 100-400L. The other big challenge will be the AF performance, an area that many third-party lenses have failed to match the 'in house' brands. Sharp as a tack doesn't help if it can't focus on what you're shooting! Still, I'm intrigued to see how the various reviews pan out. It'd be wonderful to augment my 100-400L with something that has more reach. And the 500 and 600L's are just not economically feasible for me, despite their amazing IQ and features. I really do hope Tamron pulls this off!
This lens could be the bargain of the century, if it turns in a decent performance. 600mm on a budget is awfully tempting for someone with limited funds!
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