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Thanks for that H. My Canon 300mm F2.8L has been dewed on, rained on, covered with thick crusty frost and in very dusty places. All L lenses will not let moisture or dust in as they have 'O' ring seals.
Not only are they optically as good as it gets they are built to be used! I have never been worried where I take my L glass. There is no point in having something if you do not use it for what it was designed to do.
The only time I was really worried when a magpie used the lens as a perch. Fortunately the lens hood was on.
Tornado33 has a very early version of the 300mm F2.8L made in the late seventies that he bought from me. It was used in cinematography before I obtained it. The opening scene in 'Tootsie' was shot with a lens just like this? one (walking down the street). I tested it and it was just a tad not as good as my later 300mm F2.8L. In those days Canon selected the best versions to convert to the Arriflex coupling. They cost over 20k US in 1980! You must have all seen what both lenses can do with astro images.
If my more modern lens lasts as long as Tornado33's version it should do me past the ton. For what it does it is worth every cent and more.
Bert
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