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Old 18-09-2015, 10:15 AM
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bojan
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Location: Mt Waverley, VIC
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Hmmm..

According to this doc (http://www.micro-tools.com/pdf/Canon...%20L%20USM.PDF.. it is not the same lens, but the opical design is the same/similar), both protective plates are the same part number.

It could be just an additional insurance - in case one surface was damaged, it could be removed with no cost involved.. or am I here assuming too much

There must be a better reason for that.. but unfortunately, not much about this lens is available on web.
As for potential radioactivity, this could be checked easily with Geiger.. will do asap.

Last edited by bojan; 18-09-2015 at 12:46 PM.
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