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Originally Posted by mw_aurora
I looked into this recently when comparing Sigma and Canon Prime lenses...whilst not gospel from the manfacturers, this is what I understand:
The latest Canon lenses have 3rd generation IS, which means that it detects if placed on a tripod (or similar) and 'switches off' to avoid feedback loops -
However, I understand that the manuals for lenses with 3rd generation IS did say to switch off the IS on a tripod, although this may have been changed now.
Cheers Mark.
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You seem to be contradicting yourself!
For the final answer - from the proverbial horse's mouth:
http://www.cps.canon-europe.com/kb/d...jsp?faqId=1130