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Canon 300mm f/2.8L IS + EF Extender III 2X

This page shows how the 2X extender performs with the Canon 300mm f/2.8L IS USM. With the 2X Extender, the 300/2.8 becomes a 600mm f/5.6.

Test scene

As shot.

Live View with Mode 2 was used for zero vibration, along with contrast-detect autofocus. I also shot 4 series. There was some slight variation; I chose the best one, which had a marginally better center than the others, and slightly less better right side than one (due to the same asymmetry as seen with the 1.4X converter and the 70-200 zooms).

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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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