Brassed/Peeling Pana Bayonet Mount

May 11, 2018
Melbourne Aus
A Pana 45-175mm lens on sale on ebay has a pic of it's mount showing some wear [see pic]
Any idea how it was caused....and any advice, positive/negative regarding buying said lens in this condition?
I have never noticed damage like this on a lens before but I'm guessing it just indicates regular mounting and unmounting?
From a reputable dealer, at a good price and the rest of the lens looks fine.

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Mu-43 All-Pro
Dec 1, 2013
New Hampshire
Real Name
I don't know about that particular lens, but people have been reporting "metal shavings" coming off the Pany 100-400 lens when mounted on a too-tight Olympus body. Then the shavings get into the camera itself. Is this what they talking about? I mean, it kind of looks like it might be that.

Those silver-colored flakes have to go somewhere when they detach (leaving that brass-colored material behind, it looks like). So if this is the same phenomenon, then I think I'd stay away from the lens if you have an Olympus body. I suppose it would be safer with a Panasonic body, but once it starts to flake, I'd think it might continue. I wouldn't want those flakes falling into my camera!

You could find the reports about the 100-400 and see if they match.


Mu-43 All-Pro
Mar 20, 2012
Melbourne, FL
If the lens mount was contaminated with something that was not cleaned off, then there would be a weak bond between the base metal and the plating, which would begin to flake off with time. I wouldn't buy the lens.


Mu-43 Veteran
Aug 18, 2020
I don't think those imperfections are caused by a mount that's too tight.

I had some bad copies of the mentioned Panasonic 100-400, but didn't closely inspect (nor photograph) the lens mount. So I can't vouch for whether it appears the same. I was more concerned with preventing damage to my camera.

I think I'd pass, too.


Mu-43 Hall of Famer
May 15, 2016
Sydney, Australia
Some camera mounts are tighter than others.
I have three Mu-43 cameras and the same lens fits Differently on all three
On my Panasonic G85 I cant even fit some annual focus adaptors. The best camera I have for fitting adaptors is the old E-P5

As per above post the worst cases were with the Panasonic 100-400 that left shavings in an Olypmus body. From memory the pictures were posted here and at DPR.

The mount tollerances must be slack with the supposedly Mu-43 consortium.
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