However, the combination of this zoom with a converter is only practical in exceptional cases. If you use the 2x converter at 400 mm, the light intensity is reduced to aperture 11. The autofocus is no longer working because there is insufficient light, and comes at 800 millimeters Also the image stabilizer quickly reaches its limits. Both are arguments for a tripod. Shading in order to improve the corner contrast does not help in good light conditions, as the diffraction of the smaller aperture reduces contrast and sharpness.
Canon EF 4.5-5.6 / 100-400mm L IS USM - EF 1.4x II (Canon 5D Mark II)
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