I am looking at both the Canon 1.4X III and Canon 2.0X III. What I am confused is why they are both at the same price. Been reading some reviews on the web, but given that both are the same price, which one to choose? I am aware of the loss of 1 or 2 stops of light as well as image quality being not as sharp. I have a 7D and 5D3 with 70-200 2.8 II. I would love the notion of extending the reach to 640mm on my 7D, but I don't know if that means that my image quality would suffer greatly or settle for the 1.4X and be limited to 448mm. Or I can settle for 280mm or 400mm on my 5D3. My intent for the extra reach would be for wild life.
Any advise? Thanks in advance.
Any advise? Thanks in advance.

