Archived posting to the Leica Users Group, 2011/04/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 at acm.org> To: "Leica Users Group" <lug at 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 at acm.org> >>To: "Leica Users Group" <lug at 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 at 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 at 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 > >