It has the rubber gasket around the lens mount, of course, but it also has fluorine coatings on both the front and rear elements to resist water and oil and nice sealing around the switches. The Sigma has the “extra mile” when it comes to its weather sealing. I shared my initial thoughts in the unboxing video where you can also see how the lens arrives and what comes with it. In this review I will be highlighting what I perceive as the strengths and weaknesses of this lens and will also be sharing a host of images that should help tell the story. For a primer, you can read my review of the Canon 100-400L II here or my review of the Tamron SP 150-600mm VC here. One should not mistake them for being optically inferior. Yes, it is a variable aperture lens, but it is a variable aperture lens in the way that the Canon 70-300L and the new 100-400L II are variable aperture lenses. This is a pro lens with a pro build and premium optics. Yes, it is definitely very heavy (more on that in a moment), and yes, it’s price is nearly double that of the Tamron, but the Sigma is undoubtedly a premium lens that, if anything, is probably a bargain at its roughly $2000 price tag. While some of those initial reservations are undoubtedly true, I must confess that the new Sigma won me over during the review period. I struggled to see the market for a more expensive, much heavier version of the already very popular Tamron lens. I saw the specs (including the heavy weight and increased size over the Tamron 150-600 VC), and the MTF charts and early shots didn’t seem to be a lot better than the Tamron. Confession time: I had pretty much written off the new Sigma 150-600mm f/5-6.3 DG OS HSM SPORT lens before I reviewed it.
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