Depends on what you want to shoot and what aperture u shoot with. Also depends on how big you want your prints. Its always a degradation putting more optics between ur lens and sensor but...Ahhhhhh!! that's what i'm afraid of!
Hi cibs...all those sports shots are at 400mm? what aperture did you use? I always read stop down to F8 is best. In your opinion, is that good to take some distant animals like cats, lizards and birds? Am considering same option as I probably do not need the 400mm that often.
Thanks! This is very helpful. Will get one and try it out.Not necessarily f8. If you are using an L, about 2/3 - 2 stops down from wide open seems to be sharpest. Once you put on ur extender, ur lens effectively becomes a daylight lens.. i wouldnt recommend small things like birds and lizards.. the effective resolving capabilities of the lens is diminished by the extender..