Am considering buying an extender for my Canon 200mm f2.8 L lens for wildlife, including bird photography. I realise a longer focal length lens would be best but a compromise is necessary due to cost and weight limitations. The Canon extenders are too expensive and I have to consider alternatives. Wonder if anyone has used Kenko or Sigma extenders? I need to check their suitability for my lens somehow and if auto focus is maintained. Do I ask Canon, Sigma or Kenko about suitability?
Roy
Roy
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