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http://www.prophotohome.com/forum/ca...t-version.html
"the weather sealing on the 70-200 f/2.8L series was introduced with the IS version. There are many L series lenses that are not weather sealed - only those introduced in 2000 and beyond have it. Those introduced before that do not."
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The L series is a tightly constructed lens and thus offers a version of weather sealing as per the Nikkor AFS.
Now, like the Nikkor AFS, Canon introduced new lenses with “weather seal” designations, those lenses are identified by the little rubber sealing/seating ring on the lens throat that mate with the cameras lens mounting collar.
Only these lenses are “now” considered “weather sealed” ~ however, in general the Canon L series was considered weather sealed prior to this. Obviously it was eventually discovered that the greatest cause of camera damage was through the ingress of water into the electronics though the [loose] lens mount.
Prior to this was it was the eyepiece.
Nonetheless, an older L lens needs a modicum of weather protection and the typical sports shooter found the use of a towel to be sufficient protection for the duration of a soccer match as example."
W skrocie - ogolnie Lki sa szczelnie skonstruowane ale mimo tego nadal sprzet czesto sie uszkadzal przy duzej wilgotnosci/deszczu itp. Canon w koncu sie zorientowal ze wiekszosc uszkodzen powstaje z powodu wilgoci skupiajacej sie i przedostajacej sie do bagnetu, tak wiec dopiero wprowadzenie w 2000r. gumowej otoczki bagnetu by uzyskac pelna szczelnosc po podpieciu do body pozwolilo wyeliminowac tak duze zagrozenie z tej wlasnie strony. Wszelkie Lki wyprodukowane przed 2000r. nie maja takiego zabezpieczenia i podobno dosc czestym widokiem bylo zabezpieczanie bagnetow np recznikami.