Originally posted by Cambo a shame to destroy the impeccable image quality of that lens with ANYTHING
True, but I like to play with my equipment. I even tried some extension tubes on the FA*85.
Originally posted by Lowell Goudge true, it will not show F2.5 but only F2.8, however, that does not change the reality that the TC when added to an F1.4 lens gives you optically an F2.5 lens regardless of the aperture the camera sees.
Well by theory 1,7x1,4=2,38 but the AF1,7 TC is made as f2,8 tops. Check it's user manual, if you don't trust me. I guess it is due to smaller diameter of the lens in it...