Reviews and Problems with Canon EF 300mm f/4L IS USM
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Value for money 8
Overall quality 8
Build quality 10
Canon EF 300mm f/4 USM L IS - Review / Test Report
31 July 2008
Conclusion: Two samples of this lens were tested during the last year with the 2nd one being substantially better. All tested lenses are supplied by users so they've already seen some field usage over time. Nonetheless the variations in quality are disappointing for a designated L class lens.