Evaluation:  
Conclusion: bad copy
Review: I received a bad copy from adorama.com today. I was really disappointed because I had great expectations from adorama.com..I'm sending it back today.
Evaluation:
Conclusion: Excellent low light lens...
Review: I have only been into digital SLR photography for a few months now but I have found this lens to be an excellent value and would highly recommend it to others. Due to the large aperture of this lens (f/1.4) I am able to take excellent photographs in very low light conditions with fairly low shutter speeds which avoids most blurring of shots due to movement of the subjects (this is the reason I purchased an f/1.4 lens). The lens focuses very quickly in most situations (it seems to be better than the kit lenses that came with my Olympus E-Volt 510 DSLR). I also like the true mechanical manual focus on this lens over the Olympus kit lens's motor driven manual focus.
Evaluation:
Conclusion: Great lens, but not without problems
Review: I did a lot of research befpre buying this lens, and all my research only compelled me to not buy this lens as many people had experienced severe front and back focus problems with this lens, however I still decided to go ahead buy the lens as I wanted to experience the lens for myself before making any decisions.
My first impressions were very good, but as soon as I started testing the lens, I noticed that the lens had a front focus problem, especially wide open, but this didn't go away completely even when closed down to F2.0.
I've taken some great sharp shots with this lens, but the focus is very hit or miss. Also, the focus isn't as fast I had expected even with the large aperture. In face the lens struggles to focus in low light even in scenarios where my 14-42mm F3.5-5.6 lens focuses relatively quickly.
Pros: Fast lens, very sharp, very accurate distance meter, excellent build quality.
Cons: Front focus issues, slow AF, lack of macro support makes shooting at wide open very hard.
Evaluation:
Conclusion: front focusing
Review: I happened to get a bad copy of this lens. It front focused very badly. I am sending it back to Amazon for a full refund after going around with the customer service rep, he finally did the right thing even though it is past the 60 day return because I really want an exchange. I hope to order another & get a good copy. The few times I got spot on focus by luck, it was very crisp. Hope to get a good copy next time. The focal length is great for indoors.
Evaluation:
Conclusion: Ultra Sharp, great for everyday portraiture.
Review: I bought this lens 2 months ago, and since then it has rarely been detached from my camera. I do a lot of portraiture, and it works great for nearly all situations. It's fast and sharp. I love it.
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