Reviews and Problems with Canon EF 28-300mm f/3.5-5.6L IS USM
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Value for money 7
Overall quality 5
Build quality 8
Canon EF 28-300mm f/3.5-5.6 USM L IS (full format) - Review / Test Report
6 February 2010
Conclusion: The Canon EF 28-300mm f/3.5-5.6 USM L IS is an impressive piece of engineering. However, its immense zoom range doesn't come without compromises - especially on a high resolution full format DSLR. The resolution figures are actually pretty good in the 28-100mm range but there's an obvious penalty beyond 200mm with rather soft borders at large apertures. This is acceptable in some situations (e.g.
Canon EF 28-300mm f/3.5-5.6 USM L IS - Review / Test Report
22 February 2008
Conclusion: The Canon EF 28-300mm f/3.5-5.6 USM L IS is an impressive extreme range zoom. The optical quality is on a very high though not exceptional level. The resolution figures are generally very good without any major flaws. Vignetting, CAs and even distortions are very well under control. The build quality is exceptional though some may not like the push-pull zoom design.