[rollei_list] Re: OT: Leica lens polishing
- From: Marc James Small <marcsmall@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sat, 02 Mar 2013 21:45:23 -0500
At 04:15 PM 3/2/2013, Ellestads wrote:
>I believe that I remember Don Goldberg telling me years ago when he worked
>on my old 5 cm screw mount Summicron that almost all of the screw mount
>lenses had soft coatings inside. Cleaning would reduce the coatings.
Zeiss owned the patent on hard coatings and was
hardly going to share it with Leitz, though Zeiss
did license it to JSK and Voigtländer. So Leitz
had to use a drip-coating method which left a
soft coating. These were used on both external and internal elements.
The haze on 1950's Leitz lenses, though, is a
product of the outgassing from the
lubricants. Open lens. Clean lens. Reassemble lens. It is that easy.
I have had almost all of my pre-1960 Leitz lenses
hard-coated by John Van Stelten at Focal Point, in Colorado.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
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