Just a quick question about the difference between ef and ef-s lenses. I have been reading up bit still am a bit confused. I know on the non full frame cameras the multiplier is 1.6 for canon. I am looking at two lenses the ef-s 17-85 and the ef 28-135 now the ef-s after conversion is roughly the same as the 28-135 before. I want to stay open to a full frame camera down the line so the ef is my best bet to not have to rebuy. My main question is does the 1.6 conversion also apply to the ef lenses effectively making the 28-135 a 45-216mm?