Ville, can you tell me that which camera will give me better picture? Canon XSI(18-55) or Nikon D80(Sigma 50mm, macro, )?

2 I think it really depends on your lenses rather than the Canon or Nikon bodies. If you like macro, obviously you'd go for Nikon because of your existing lenses. Conversely, if you think you'd do lots of wildlife and others that can use the 100-300, Canon will be the way to go.

You're probably better off with Canon. Your 28-105mm lens is useful but not quite wide. One way is to get the 18-55 IS.

Another thing you could consider is to get one of the ultrawide lens.

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