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Old Aug 4, 2011, 7:42 AM   #11
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Location: Euless, Tx.
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Originally Posted by shoturtle View Post
I need a longer lens, thinking about a kenko 1.4x tc for the 70-300. Or going with a canon 100-400L

I use a Promaster 1.4X with my 100-300mm and it adds nothing but magnification. Because the Wide open f stop is only 4.5, the auto focus will NOT work. If your 70-300 is f3.5, the auto focus will most likely work just fine. The image Q with the 1.4x T.C. attached appears identical to what it is without it. For some reason, T.C.'s of 2X or greater will degrade image Q and should be avoided.
Sony A57 with 18-55 kit lens, Sony A200 and Sony H70
50mm f3.5 Minolta Maxxum macro
24mm f2.8 Minolta Maxxum
100-300mm Minolta Maxxum APO Zoom
70-300 Sony apo G SSM Zoom
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