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For those who are interested I am doing a load of comparison pics between the above lenses (Sigma 17-70 OS f2.8 - 4 : http://www.amazon.co.uk/Sigma-optic...JB32/ref=sr_1_1?ie=UTF8&qid=1298116102&sr=8-1) and the Tamron 17-50 f2.8 VC: http://www.amazon.co.uk/Tamron-AF17...D6ZQ/ref=sr_1_3?ie=UTF8&qid=1298116137&sr=8-3)
First of my comparison pics
Sigma @ 17mm, f2.8, ISO 640, 1/500sec
![](/proxy.php?image=http%3A%2F%2Ffarm6.static.flickr.com%2F5256%2F5457777043_6473bf6bfc_o.jpg&hash=3a0047fa7b3906c7e554c6caad41c76e)
Sigma 17mm f2.8 by futureal33, on Flickr
Tamron @ 17mm, f2.8, ISO 640, 1/1000sec
![](/proxy.php?image=http%3A%2F%2Ffarm6.static.flickr.com%2F5060%2F5457780505_9e2945e8d4_o.jpg&hash=4feb7e7d2d8766036a1f0bab5da5a4d2)
Tamron 17mm f2.8 by futureal33, on Flickr
100% Lightroom crop - Sigma on the left, Tamron on the right
![](/proxy.php?image=http%3A%2F%2Ffarm6.static.flickr.com%2F5100%2F5457781881_a5b85f26af_o.jpg&hash=efa8aa9278b768cf5cf41f64170706e1)
Sigma left Tamron right - both F4 by futureal33, on Flickr
More on the way
First of my comparison pics
Sigma @ 17mm, f2.8, ISO 640, 1/500sec
![](/proxy.php?image=http%3A%2F%2Ffarm6.static.flickr.com%2F5256%2F5457777043_6473bf6bfc_o.jpg&hash=3a0047fa7b3906c7e554c6caad41c76e)
Sigma 17mm f2.8 by futureal33, on Flickr
Tamron @ 17mm, f2.8, ISO 640, 1/1000sec
![](/proxy.php?image=http%3A%2F%2Ffarm6.static.flickr.com%2F5060%2F5457780505_9e2945e8d4_o.jpg&hash=4feb7e7d2d8766036a1f0bab5da5a4d2)
Tamron 17mm f2.8 by futureal33, on Flickr
100% Lightroom crop - Sigma on the left, Tamron on the right
![](/proxy.php?image=http%3A%2F%2Ffarm6.static.flickr.com%2F5100%2F5457781881_a5b85f26af_o.jpg&hash=efa8aa9278b768cf5cf41f64170706e1)
Sigma left Tamron right - both F4 by futureal33, on Flickr
More on the way