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dslr camera brands...

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I'm thinking of buying a dslr camera. I would mostly be taking pics of fish, and random cool things on the water. I'm leaning towards Nikon and Canon. I'm curious as to which brand is, or may be, a better choice for a beginner. Also, would a 18-55 lens be sufficient for taking pics of crawling or tailing fish at a bit of a distance?. I know, basically, nothing about photography or quality cameras. Any advice would be greatly appreciated.