Reviews and Problems with Canon EF 100-300mm f/4.5-5.6 USM
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Value for money 6
Overall quality 4
Build quality 5
Canon EF 100-300mm f/4.5-5.6 USM - Review / Lab Test Report
9 March 2007
Conclusion: In terms of optical performance the Canon EF 100-300mm f/4.5-5.6 USM is about in line with other consumer grade tele zoom lenses. The resolution figures are excellent and 100mm but unsurprisingly there's a penalty at longer focal length specifically at 300mm @ f/5.6. At 200mm and more so at 300mm you should stop down a little to lift the resolution and contrast level.