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Message: <blockquote data-quote="cbg" data-source="post: 85804" data-attributes="member: 10561">I have the Sigma 150-500, OS HSM and have used it with a D5000, but not the 5100.  I've been using it for about 15 months or so, and as has been said, it really does need light to focus well.  It can be a little soft wide open at 500mm, does very well at f8 backed off a little from 500mm.   It can be handheld, and I do handhold it a lot when I shooting birds in flight, but at about 4.5 lbs it does get heavy.  Take a look at my flickr stream for some examples shot with it.<a href="http://www.flickr.com/photos/cgilyeat" target="_blank">Flickr: cgilyeat's Photostream</a>Colin</blockquote>