Tamron or Sigma Long Zoom Lenses?
If you use the tele-converters, you must lock the lens for a minimum of
100mm rather than 50mm, otherwise the internals would collide with
the extenders.
That depends on whose extenders you use. Certainly this is the case with he
Sigma and Canon extenders, but is not so with the Kenko Teleplus Pro series.
Cheers
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