I just need some quick clarification.
Lets Assume a 300 f/4L IS is on a 50D. Due to the 1.6x crop factor, this effectively means the 300mm is actually 480mm.
If i put my 1.4x TC on, does this boost the focal length to 672mm? I also understand i will lose a stop and it will become a f/5.6 and i can still retain AF.
I've searched for an answer, and even asked a camera store, but failed to tell me if this is true.
Sorry if it sounds noob!