Reviews and Problems with Canon EF 300mm f/4L IS USM
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Agent PS, B&H Photo
25 June 2008
Summary: Amateur - however did photography for a living several years It's a good build, solid lens. Reasonable weight, price and speed. A good balance. However the one fundamental disappointment with this lens is the poor resolution and sharpness. Did test shootings with the 1:5,6/100-300mm USM, the 1:2,8/70-200mm IS with Canon 1,4 TC and the Tamron !:5,6/200-400mm using a Siemens test chart.