First Round of Sigma 150-600mm OS Sports Lens Test Results

I mentioned that reviewing the Sigma 150-600mm f/5-6.3 DG OS HSM Sports Lens was one of my top priorities and a friend came to my rescue by providing a copy of this lens to test. I have good news and bad news to report.
 
I temporarily added image quality results to the review page but have subsequently taken them down. After comparing the results from this lens to the Canon EF 100-400mm L IS II USM Lens and Tamron 150-600mm f/5-6.3 Di VC USD Lens, I was left quite disappointed. Further evaluation revealed a strong likelihood of a misalignment issue with this lens.
 
Shown in the image accompanying this post is the near-top-left and the near-top-right crop from one of the test images. The top left crop is obviously very significantly sharper than the top right, which is the crop that shows in the site's image quality tests. A similar difference can be seen over the entire focal length range of this lens.
 
The bad news of course is that such an issue is showing in a lens this nice (and this new). That is very disappointing. However, I expect that Sigma will be able to resolve the problem and that leads to the good news: that top left crop from a 150mm wide open aperture is looking really nice. I remain optimistic that this is a really nice lens overall, with image quality to match the high grade look and feel of this lens.
 
We'll test another copy of this lens as soon as we can get our hands on one.
 
The Sigma 150-600mm f/5-6.3 DG OS HSM Sports Lens is still not in stock, but is available for preorder B&H.
Posted: 2/9/2015 9:09:29 AM CT   Posted By: Bryan
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