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Message: <blockquote data-quote="dharma66" data-source="post: 3666462" data-attributes="member: 42205">Yes, there are two version of the Sigma 150-600.There is the “Contemporary”, which has “C” in the lens name. This retails around £700 in the UK at the moment.Then there is the “Sport”, which has “S” in the name, and retails around £1300 UK.The C is built mostly with (good quality) plastics, and some metal internal parts. The S is built from metal throughout. The S is also fully weather sealed, whereas the C is not.The S also has more elements, and is (according to Sigma at least), a little superior, optically.Edit:Also, in terms of the D3100, I’d agree with Simon, in that it’s a smashing entry level DSLR. I started with a D3300, which isn’t that much different...and so far I haven’t upgraded, because I’ve not felt the lack of anything!</blockquote>