Quote:
Originally Posted by rsegoly
thanks but 100-400 will give me only small additional over what I have now
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The problem is once you start looking for anything over 400mm you start moving into big-bucks territory with the previously mentioned Sigma 50-500mm "Bigma" or Tamron 200-500mm being the only real cheap
ish lenses available in that range, I say this without knowing your budjet so I could be wrong here.
Quote:
Originally Posted by Liam O'Neill
If you combine the 100-400 with one of the teleconverters (1.4x is optically better than the 2x one) then you would have a big increase in range. Canon, Tamron and Kenko make them, but they won't work with all lenses, so make sure before you buy (and the 2x one will probably stop your AF working)
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You will definately loose autofocus using the 2x coverter with the 100-400, and unless you have a full-frame sensor camera (e.g. 1D mkII, 1Ds mkII) you will most likely loose autofocus aswell with the 1.4x when used with the 100-400. I believe a few 100-400 owners have retained autofocus using one of the Kenko 1.4x converters, but it seems to be pot luck as to wheather it works, with most saying it dosn't.