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Up until this year, Juan, I used the 300f4 for everything. Very useful lens, lightweight, IS, f4, sharp, can't beat that! I used a teleconverter for years. And two canon tubes. I don't think it matters which brand tubes you use. The off brand teleconverters for instance the Tamron focus faster than the Canon. I have both.
Some of my pics mainly most of these in this slideshow....and many more albums dated before June 2009. www.ocwildlife.com