Archived posting to the Leica Users Group, 2001/03/14

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Subject: [Leica] Re: Lens coating
From: Dr H L Lau <>
Date: Thu, 15 Mar 2001 08:02:47 +0800
References: <>

Hello all,

Could you please help me on this?

I have a 50mm Summilux (no. 166xxxx) M-mount, probably made in 1959, which I bought used some time ago.  One day when my friend looked at this lens, he said it had something weird about its coating. The
reason he gave is that when you look at the reflected images from the lens surface under a lamp, the series of reflected images are coloured (which is normal) but one of them in the middle of the series is
not coloured (white if you look under a fluorescent lamp, which he said is abnormal and shows a coating problem or re-coating).

The lens works beautifully, with no flare or ghost images (well, I did not shoot at a light source).

Is there really a coating problem? Or is it "normal" for a Summilux of this vintage? I've looked into Laney, Bower and Kisselbach and could not find an answer.  Is this something I have to look out for when
buying used lenses in future?

Horace Lau

Replies: Reply from Kip Babington <> (Re: [Leica] Re: Lens coating)
Reply from "onetreehillclw" <> (Re: [Leica] Re: Lens coating)