When I am fotographing, I sometimes need a focal lenght beyond the focal length of the lenses that I own.
Because the lenses nowadays are not getting much cheaper, buying for example a 400mm lens is not funny!
Therefor, as I am usually shooting during daytime in well lit environments, I would like to buy a zoom extender (TC). That way, I can keep using the lenses I already own without having to buy new ones for those rare occassions where I need them.
It so happens that both Canon, Sigma and Kenko sell teleconverters, but I find it hard to pick one.
Therefor my question "Which one would you pick and why?".
Shooting all kinds of subjects, so no particular purpose for the TC other then "just extending"
I am curious about the results!