Alan, you gave me an opportunity to look into the construction of the metal barrel lenses ! :-).
Don't blame me if you broke your lenses. :-)
I am almost certain that you are not seeing steel (but I could be wrong). As Tom (Rittenhouse) said, the corrosion is an additional factor. Aluminum severely corrodes but the anodizing cures it.
Perhaps I should ask the representative with my next email to Pentax. Will let you know if they told me the answer. :-)
regards, Alan Chan
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