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How often does a lens need to go to Canon for cleaning and inspection?
Shortly after beginning avian photography a couple of years ago I purchased a good 500 f4L from one of the members in this forum. The lens has served me well and I have no complaints about it at all, but how often should a lens be sent to Canon for cleaning and general repairs? Are there any updates that they would be able to do to enhance focus speed or other benefits?
Thanks in advance,
Greg
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