Can anyone tell me the difference between a Canon 2x converter and a generic
2x converter, such as Tamron or Jessops?? And the huge difference in price?
This may be a silly question to some, no doubt...
Is it something obvious such as there being a big difference with the
quality of the optics.
I hear the autofocus may be affected as well. Could somebody tell me why? I
use an EOS 600 with a 75-300mm zoom.
Many thanks.
Sean.
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