Analysis of information sources in references of the Wikipedia article "Ống kính Canon EF 70–200mm" in Vietnamese language version.
Unlike its IS sibling, the Canon EF 70–200mm f/2.8 L USM Lens is not fully weather-sealed — Extra caution will need to be taken in wet conditions.
The Canon EF 70–200mm f/4.0 L IS USM Lens is the second lens in the Canon 70–200mm L lens family to sport weather sealing (the f/2.8 IS is the first).
