Hi all,
I am thinking of buying this lens and a 1.4x/2x convertor. I am currently on a 350D body using sigma 170-500mm lens with the option of the 1.4x convertor, will i see far superior results or am i best to stick with what i have ?
cheers
jason
I used to use the Sigma 170-500 lens and am sure you'll see a real difference if you change to one of the Canon L lenses. I would expect that with the 300 f4 you'll end up using the 1.4x on it almost all the time, but even with the 1.4x om it the IQ will be better than the Sigma. The best way to tell if it's the set up for you is to get to a camera shop and try it for yourself.
With your 350D you'll only get reliable AF when using the 1.4x converter. You can try the 2x (and tape the pins as described elsewhere) and in good contrasty light you may still get AF, but AF hunting is more likely.