Upload & Sell: Off
wouldn't it need a new optical design to stop focus breathing? and if it doesn't have that isn't $3000 extra a bit gigantic profit margin just for the new housing even with limited quanities?
First, I'm not sure that focus breathing has been eliminated (I would hope for the price that Canon is asking) and yes to do so would dictate a lens design/hardware change... however, while the CN-E 24, 50, and 85 lenses are all based on the EF 24L, 50L and 85L lenses they're also very different. For example all three CN-E lenses have rounded 11 blade aperture diaphragms (I couldn't find the number of blades for the 24L, but the 50L and the 85L both have 8 rounded blades). Also all three CN-E lenses "share the same front diameter, form factor, optical design, placement of gear rings, and mechanical construction. Because of the identical characteristics, one lens can be swapped with another easily, even when geared accessories are involved." I think everyone here knows that there are major differences in form factor between the 24L, 50L, and 85L. So while they may be based on the EF lenses it appears they've had some major hardware changes. That doesn't necessarily mean that they're worth the extra $3,000 that Canon is asking for either (up to the individual to decide).