well.... at this stage of the game, my lens collection has out done anything i ever possibly imagined it doing, so the only converters of any real use to me are the sony / minolta APO converters as the lenses i would use them on, will only fit those converters. and i dont need them on my non APO / G lenses (mostly primes that are wide angle, and a couple of short tele primes that i would not use them on, i would just use a different lens) the real intest to me in T/C's are for the 70-200 ssm, the 200 g hs. and the 300 2.8, and i already have a 2x now i just need a 1.4,
if some one wanted to swap for a nice 1.4 i would do that.
and it is just the 2x and 1.4 x