Rear element dust - metal flakes?

Started Apr 1, 2013 | Discussions thread
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BobORama
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Rear element dust - metal flakes?
Apr 1, 2013

Is there any known issue what would lead to very small metallic flakes being shed by the camera?   I've been seeing them turning up on various lenses.   In one instance a bunch showed up after the lens ( and rear cap ) were immaculately clean.

"Enhanced to show texture."

The common denominator is lenses with rear positioned real elements.

If it were ordinary dust, I'd not be too concerned "dust happens", but this stuff looks more like glitter,

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Pentax K-5 Sigma 10mm F2.8 EX DC HSM Diagonal Fisheye Pentax smc DA 18-55mm F3.5-5.6 AL WR +8 more
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