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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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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.

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

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