VC „silver“ lenses: material and surface ?

veraikon

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Modern lenses are made in a material mix (outside often aluminium -alloy, inside brass). The black ones are made from anodised aluminium. As far as I know it is not possible to chrome aluminium.
At big “L*” the “silver colour” is chromed brass, therefore the chrome lens models are heavier than the black ones. At FSU lenses the silver is pure polished aluminium without any surface coating.
But what is the “silver” at the modern Voigtländer –lenses? Concerning the product information they are not heavier than the black ones (no chromed brass) and don’t look like polished aluminium. Can anybody tell me about. Background silver VC lenses are often offered at a lower price than black ones.
 
The discontinued but available 28mm 3.5 and 50mm 2.5 are chrome on brass.I believe the others are anodized but haven't handled them all.The new M mounts are all black apart from the 35mm 1.2 not sure about them as haven't any of them.(yet!)

Regards
Steve
 
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