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<blockquote data-quote="SteveH" data-source="post: 595640" data-attributes="member: 9252">Well I like Sigma lenses generally, I have 3 now and find the quality excellent - I did have a problem with my 150-600 where the OS motor failed, but they sorted that quickly and without fuss so I can't complain.Optically, the 3 are very close - The Nikon is shorter at the long end (500mm), but it is also faster having an aperture of f5.6 right through the range - The Tamron and Sigma &quot;C&quot; (Contemporary) are the same, specs-wise so it really is personal preference, although the Sigma has an optional USB dock that you can use to update the firmware, fine-tune focus and set the custom modes up to your preferred settings.For extra funds, there is the Sigma 150-600 Sport, which is heavier, more robust and has weather sealing and some say a little sharper....I took my camera and memory card to a shop that stocked all four (Sigma C &amp; S, Tamron &amp; Nikon) and had a shoot-out... The guy in the shop popped my shots up on a big monitor in the shop and we looked at them all - I came away an hour later with the Sigma C.It is always worth finding a local retailer and trying things out before you buy - Build a relationship with them and they'll often be happy to let you out of the shop for 15-20 mins with a lens to try.</blockquote>

[QUOTE="SteveH, post: 595640, member: 9252"] Well I like Sigma lenses generally, I have 3 now and find the quality excellent - I did have a problem with my 150-600 where the OS motor failed, but they sorted that quickly and without fuss so I can't complain. Optically, the 3 are very close - The Nikon is shorter at the long end (500mm), but it is also faster having an aperture of f5.6 right through the range - The Tamron and Sigma "C" (Contemporary) are the same, specs-wise so it really is personal preference, although the Sigma has an optional USB dock that you can use to update the firmware, fine-tune focus and set the custom modes up to your preferred settings. For extra funds, there is the Sigma 150-600 Sport, which is heavier, more robust and has weather sealing and some say a little sharper.... I took my camera and memory card to a shop that stocked all four (Sigma C & S, Tamron & Nikon) and had a shoot-out... The guy in the shop popped my shots up on a big monitor in the shop and we looked at them all - I came away an hour later with the Sigma C. It is always worth finding a local retailer and trying things out before you buy - Build a relationship with them and they'll often be happy to let you out of the shop for 15-20 mins with a lens to try. [/QUOTE]

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