The focal length won't change of the lens, but the effective field of view will. Multipl the fl by the crop factor, so 300 x 1.6 = 480 efl. Multiply by 1.4 for the extender.300 lens on a Canon 7d = what focal length ?
And with a 1.4 teleconvertor =?
Many thanks.
7d is a cropped sensor,1.6
672 in total?
lens plus extender, yes.672 in total?
Min aperture of the lens will also change with the t/c, so it goes from f4 to f5.6
Min aperture of the lens will also change with the t/c, so it goes from f4 to f5.6
...and it's touch and go if it would still AF?