Archived posting to the Leica Users Group, 2011/04/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I once had the same problem, in the eighties, with the lenshead of the Telyt 1:6.8/560mm. It had a nasty yellow cast, due to the yellowing canada-balsem-cement. A friend of mine took it to Wetzlar (with his Telyt 800, which had the same problem) The guys in Wetzlar 'replaced' the balsem, without any costs. Sometimes this yellowing is caused by little cracks in the kit around the cemented lensparts. Oxidation of the balsem occurs then. I still have this 560-lens and it is still OK! Regards from The Hague, Fred Hess ----- Original Message ----- From: "Jim Nichols" <jhnichols op lighttube.net> To: "Leica Users Group" <lug op leica-users.org> Sent: donderdag 14 april 2011 0:55 Subject: Re: [Leica] Lens color cast Thanks, Herb. I suspected that was the case. Though I don't own M lenses, I have come across information over the years that, if I recall correctly, said that the Canadian lenses used a Canadian balsam cement. Over the years, the cement has been known to take on a yellow cast. I'm sure others on the LUG have more knowledge of this process than I do. Jim Nichols Tullahoma, TN USA ----- Original Message ----- From: "Herbert Kanner" <kanner op acm.org> To: "Leica Users Group" <lug op leica-users.org> Sent: Wednesday, April 13, 2011 3:21 PM Subject: Re: [Leica] Lens color cast >I have taken very many looks. But just to make it clear: They are M series >lenses. Except for focal length, they have the same legend on the front: > > "LEITZ LENS MADE IN CANADA SUMMICRON - M 1:2/90" > > and > > "LEITZ LENS MADE IN CANADA SUMMICRON - M 1:2/35" > > Herb > > > > > >>Herb, >> >>I am puzzled by your information. So far as I know, the Summitar >>was only made in screw mount, and only in 50mm. And I think they >>were all produced in Germany. >> >>Please take another look, and see if your lenses are actually marked >>as you showed in your post. >> >>Jim Nichols >>Tullahoma, TN USA >>----- Original Message ----- From: "Herbert Kanner" <kanner op acm.org> >>To: "Leica Users Group" <lug op leica-users.org> >>Sent: Wednesday, April 13, 2011 1:51 PM >>Subject: [Leica] Lens color cast >> >> >>>After shooting the same subject with my 35mm and 90mm lens, I first >>>discovered that the 90mm produces a color cast roughly equivalent >>>to that produced by incandescent light. >>> >>>The two lenses are Summitar M, and state on the front: "Leitz Lens >>>made in Canada". >>> >>>It is not a problem. The color cast is easily correctable in >>>Lightroom. I am just curious as to why it is there. Is it something >>>about the glass in one of the lens elements, or has the cement on >>>compound elements yellowed through age? When I looked through the >>>lens at a white area, I saw fully uniform yellow. >>>-- >>>Herbert Kanner >>>kanner op acm.org >>>650-326-8204 >>> >>>Do not meddle in the affairs of cats, >>>for they are subtle and will pee >>>on your computer! >>> >>>_______________________________________________ >>>Leica Users Group. >>>See http://leica-users.org/mailman/listinfo/lug for more information >>> >>> >> >> >> >>_______________________________________________ >>Leica Users Group. >>See http://leica-users.org/mailman/listinfo/lug for more information > > -- > Herbert Kanner > kanner op acm.org > 650-326-8204 > > Do not meddle in the affairs of cats, > for they are subtle and will pee > on your computer! > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > > _______________________________________________ Leica Users Group. See http://leica-users.org/mailman/listinfo/lug for more information