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Canon Extender 1.4X II vs 1.4X III with 300/2.8

Let’s see how the Canon 1.4X Extender II compares to the new Extender III.

Test scene

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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diglloyd Advanced Photography

diglloyd Advanced Photography includes hundreds of pages of exclusive coverage and high resolution, Retina-grade example pictures detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare. Also included is a wealth of in-context technique and workflow insight. Since 2006, diglloyd Advanced Photography is the authoritative review and on-line reference for discerning Canon and Nikon shooters. Subscriptions cost $ per year.

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Variants III, II available in full article
Extender III — mouse over to see the II version

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