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  1. R

    420mm vs 500mm field of view

    Hello all, I already have a Sigma 100-300mm f/4. I am thinking to buy a 1.4x TC, which will extend the reach to 420mm. I wonder how much is the difference between 420mm and 500mm? It would be great if you can show me a direct image comparison from the same scene. If I shoot at 420mm on D200...
  2. R

    Hello all

    Hello all, I am completely new to birdwatching and photography. It is nice to find this forum. I hope I can learn a lot :).
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