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Old Dec 29, 2006, 4:39 AM   #1
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I recently got the 50-150. First copy front focus horribly, visible even viewed on screen (without zooming in). Second copy is near perfect. Focal point is just a bit towards the back end of DoF but it's ever so slight and it helps to blur the background so I don't mind. I think most people who think their lens is soft at 150 2.8 really have focus issues. Even mine that front focused, I noticed that the subject's eyes would be soft but the ring on her finger would be incredibly sharp to use an example. The lens is very sharp at 150 2.8 *IF* if focuses correctly. I wish Sigma would get their quality control together.

You'll find samples from my 2nd copy here, all 100% crops (about half the image) taken at 150 2.8 (maybe a few at 100mm in there but I don't think so):

http://www.advweb.com/tmp/50-150_2/2/

Here are a few of my favorites but they're all there:

http://www.advweb.com/tmp/50-150_2/2/DSC_0061.jpg
http://www.advweb.com/tmp/50-150_2/2/DSC_0075.jpg
http://www.advweb.com/tmp/50-150_2/2/DSC_0076.jpg

Also, the min focus distance is 1m but that's for 50mm. At 150mm it will front focus at 1m and that is "normal" for this lens (that's just how it is). I find at 1.5m the focus is fine. Sometimes I like to shoot real tightly cropped portraits so I have to watch out for that so I'm not too close.

You can see here a focus chart comparison of copy 1 vs copy 2:

http://www.advweb.com/tmp/50-150_2/1/

however note that since I'm at the min focus distance (1m) the test is NOT valid. The first copy front focused on 100% of my portraits from any distance so there is no doubt it was defective.

If you want to try one, I strongly suggest ordering from a company with a very liberal return policy. Amazon is the best that I know of (and cheapest) with B&H being second. There are a few reviews at Amazon:

Nikon version:
http://www.amazon.com/gp/product/B00...SIN=B000HPMP6A

Canon version:
http://www.amazon.com/gp/product/B00...SIN=B000HPOQKS

Returning mine was a breeze with amazon and I didn't have to pay shipping charges. Same is true with B&H but you get 14 days instead of 30 with Amazon...

Let me know if you have any questions about the lens.

-Michael

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