I have nikon D60 with 18-55mm kit lens and sigma 18-200mm lens.I want to start bird photography.I noticed that resolution of bird pic taken by telephoto end of sigma lens is not good at all.Will it be a better idea to buy canon powershot sx40 hs or equivalent from nikon(nikon p510 bridge)or i will invest in nikon 55-300mm lens.If there is any other option please suggest me.

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I hadn't even heard of the Nikon P510 until a friend directed me towards the link below on Flickr of a Sparrowhawk. I was quite impressed with the sharpness of the pictures and went to have a look at the EXIF. I then noticed the reference to a Nikon Coolpix P510 and went to check it out thinking it was a P&S.
