Let’s see how the Canon 1.4X Extender II compares to the new Extender III.
Right off the bat, we can see that the new Extender III has much lower barrel distortion than the Extender II, very apparent in the corners.
In addition, the field of view is narrower on the Extender III, meaning that its focal length is slightly longer. Some of this is attributable to the reduced barrel distortion, but it also appears to be a real difference in magnification.
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