Constant and good aperture all over zoom-range as well as it don't extend its length while zooming or focusing is the major strengths. It was delivered, although the seller claimed it was used, with all original packing including a nice shade and a very sturdy padded (but not at all compact) bag. It focuses very fast and accurately and delivers very sharp shots even wide open.

I have not found any relevant weaknesses except possibly the lens hood that seems a little weak.

I saw the review on the net (www.photozone.de) for this lens and found that is quite good. I must agree with what PZ found. I have earlier used manual Minoltas and have experience from both Vivitar Series 1 80-210 f=2.8-4 and Tamron SP 80-200 f=2.8. This lens as sharp as I found the Tamron to be and better than the Vivitar. Both are 'Classic manual lenses' known for their good performance. The range of 75-225 mm equal 35mm range is very suited for many of my photos, and I used the Tamron a lot on my old manual Minolta. Now I have enjoyed the Sigma out in the nature. It is to short for wildlife normally, but I have used it the same way I used the 80-200 with splendid results.

The lens is tack sharp at 2.8 as well as it is shut down a few stops. I love the size of the lens as it is much shorter and lighter than the Tamron and I have no need for the IS as I use it on my Sony A550 with steady shoot inside. I am still new to DSLR's but the Sony have not made me sad or disappointed so far. I still have to learn more of post processing of my RAW-pictures to get the utmost out of them.

I bought the lens from Germany so the price is in Euros.

Customer Service

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As I sad above, I recently changed to digital from my Minolta X700 to the Sony A550 that suits me quite well. I will probably in the future buy a Sony SLT-A55 or similar. On the Minolta I have used Vivitar Series 1 70-210 f2.8-4, Tamron SP 80-200 f2.8 that I consider to be the closest equivalent to the Sigma 50-150 f2.8. On the minolta I also have used Rokkor 135 f2.0 and Tamron SP IF LD 300 f2.8. Except for the two prime lenses the Sigma is absolutely in top class. I have not compared the Tamron 80-200 and the Sigma 50-150 on equal therms, but according to what I have seen the Sigma performs very good.