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Voila pour le 8-15 :
Built for professional performance

The EF8-15mm f/4L Fisheye USM lens features a high-grade physical design that helps to give it a high resistance to both dust and water – this enables it to be used in a range of challenging situations and, when used with a professional EOS body, in the harshest weather conditions. The external design features a new exterior texture, for a high quality look and feel indicative of all new L-series lenses.

Et pour le 70-300L :
Robust performance in all conditions

The EF70-300mm f/4-5.6L IS USM offers exceptional build quality and is ideal for daily use by professionals and advanced amateurs. The lens includes environmental protection, allowing photographers to shoot in harsh conditions – even in the extremes of the desert or rainforest. Canon’s new Fluorine Coating also makes cleaning the lens easier, and prevents smears or streaking.

Jean
Merci mon bon monsieur