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We have just added an update to our wildlife photography site of some bird pics that Esther took in Florida this year. All photographs were taken on Nikon D200 with Sigma 50-500mm lens. Anyone who fancies a look, the pictures are here:
The long lens is very effective when it makes the depth of field so shallow. Some of those sharply focussed birds against a fuzzy background (and foreground) really stand out dramatically.
You are right the Nikon is bigggggg but I was thinking of the one Sigma had on their stand, that really was even biggerrrrrrrrrr and looked like a rocket launcher, will have to have a look to see what the focal length is
I think I know the one you mean. It is the Sigma 300-800 mm zoom lens...affectionately known as the Sigmonster!!
We looked at this one but the general concensus on most photographic forums was that the Nikon or Canon fixed 500mm lens gave the best optical performance, especially when used with a 1.4 or 1.7 teleconverter. We went with the Nikon AFS 2 500mm prime & have been pretty pleased with the results. Still a hefty bit of kit to cart around nature reserves etc but it keeps us fit
______________________________________________________________ Chris
´Everyday is a good day. If you don´t believe that, try missing one!´
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Italy
Waving in memory of Peter and Fiona
Fighting with Mavis´s MESO WARRIORS 
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