76
Lenses / Re: All round lenses
« on: December 19, 2011, 12:02:30 PM »
for the teleconverters, the aperature is not doubled, like the focal length is. the aperature is decreased 1 stop for the 1.4X (f4.0 becomes f5.6) and 2 stops for the 2x (f4.0 becomes f8.0). so, i guess it is doubled in this case.
another thing to consider about using TC's is that once the aperature goes beyond f5.6, the autofocus on (most/all) APS-C bodies will not function. all manual focus.
another thing to consider about using TC's is that once the aperature goes beyond f5.6, the autofocus on (most/all) APS-C bodies will not function. all manual focus.
That was pretty creative and entertaining!