Canon 70-300mm + teleconverter....yea or nay?

The Canon converters protude into the barrel of the lens - only some of the telephoto L series can accommodate. 3rd part TC's don't protude so will fit. The advantage of the Canons is that they close that distance between lens elements and preclude any stray light
 
I use a Kenko Pro 1.4TC on my Nikon 70-300mm with no problems full a/f etc so don't be completely put off w/o checking compatibility with your lens - apart from the 1 stop loss of aperture you'd never know it was there?
Paul ;)
 
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