Ugh - read your lens manuals some lenses rated as dust/weatherproof are only fully dust/weatherproof if they have a filter attached.

Like the Canon 17-40mm f/4 L
Manual page ENG-7
http://gdlp01.c-wss.com/gds/2/0300003562/02/ef17-40f4lusm-im3-eng.pdf

Taking the shrink wrap off and reading a manual is a offence that can have your man card revoked. wtf.

#lens #weatherproof #dustproof #filter
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