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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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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.

Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.

  • Make better images by learning how to get the best results right away.
  • Save money by choosing the right lens for your needs the first time, particularly some of the new Sigma Art lenses vs Nikon and Canon.
  • Workflow discusses image organization, raw conversion and post processing. Many examples show processing parameters for direct insight into how the image was converted.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops [past 2 years or so].
  • Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
  • Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Nikon or on Canon or on Pentax.

Canon 5DMark II + 300mm f/2.8L IS + Extender III 1.4X

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