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If I recall, doesn't Canon specify the use of a filter to complete the weather sealing for this lens?
I haven't seen that in the specs.
Bob
I've seen this on other forums but there doesn't seem to be a definite answer on this. I've never put filters on and never will. Personal choice but I don't consider the protection of the front element is an advantage compared to the disadvantage of another piece of glass in the way, however good it is.
Interesting. I can't find an actual reference to the need for a 'sealing' filter myself now either, but I'm sure I read it somewhere when I was researching this lens prior to buying one.
Anyway, mine currently has a clear protection filter on it for the time being and I'm quite happy with results so far.
This article is the one where I saw a reference to needing a filter to provide full sealing...
http://www.the-digital-picture.com/Reviews/Canon-EF-100-400mm-f-4.5-5.6-L-IS-II-USM-Lens.aspx
"Designed for outdoor use, the 100-400 L II features a weather sealed design. This lens is not waterproof, but it is made to be used in wet and dusty conditions. Specifically, the manual states "Tight seal structure provides excellent dustproof and drip-proof performance" but then disclaims that sentence somewhat by stating "However, it is unable to provide complete protection from dust and moisture." Chuck Westfall of Canon USA has confirmed that a filter is required for full sealing of this lens."
Thought I was going mad, but saw the review again the other day and thought I'd share...