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07-01-2014, 06:48 AM   #1
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Sigma 17-70mm F2.8-4 DC Macro question

Hi. I recently received my new lens from B&H (great delivery to Australia btw) and have a question. In the add on the web page and in all other literature I have read the lens is supposed to have a brass mount. Mine does not. Could this be an earlier model sold as the current one or is there something different with the lenses made for Pentax cameras? It is one of the "Contemporary" line.
Cheers.

07-01-2014, 07:38 AM   #2
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What do you mean by 'brass'? Brass colored? Or brass metal? If it is plastic then I would agree that is strange. But a 'brass' mount is also usually plated (with chrome I think) to prevent tarnishing and improve wear resistance.
07-01-2014, 09:45 AM   #3
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The mount on my copy is chrome-plate over (presumably) brass. At least Sigma says the mount is brass. As noted above, most (all?) brass mounts are plated, anodized, or painted. With time, I would expect the plating to wear thin in the same manner as some of my older lenses to expose the brass beneath. Aside from plastic, the other common mount material is stainless steel.


Steve
07-01-2014, 01:18 PM   #4
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Ok fair enough. I thought I saw some images if them with a brass coloured mount. No big deal, I just wanted to be sure I had the latest version. Thanks for your responses.

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