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The Canon EF 100-300mm f/5.6 L can still convince optically with very high resoltion figures, low distortions and quite low vignetting (on APS-C). However, mechanically the lens is totally outdated and clearly substandard compared to current Canon L lenses. In fact most of today’s consumer zooms are better in this respect. If you cannot afford the new EF 70-300mm f/4-5.6 USM IS the ancient EF 100-300mm f/5.6 L remains still worth a serious thought regarding its much lower price tag on the used market and it still puts most other xx-300mm zoom lenses to shame specifically regarding contrast. READ FULL REVIEW
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