dennis_menzenski Posted July 21, 2018 Share Posted July 21, 2018 I just finished shooting a roll of HP5 in a Minolta SR-T 102 using my Minolta MC 28mm f/2.5 lens; first time I've used this lens in years. I noticed that the image through the viewfinder appeared to be somewhat "yellow." I've since learned on the internet that some MC Minolta lenses including the 28mm f/2.5 have a "problem" with yellowing due to the composition of one of the elements, the second from the front I believe. Remedies appear to include exposing the lens to sunlight for a period of time. However, no mention online (at least that I could find) on the effect of this yellowing on film. I would assume that color film might be adversely affected, particularly slide film, but I wonder about the impact on B&W. I suppose I'll find out when I process the film, but I'm wondering what other users might have experienced with this lens particularly with B&W film. Thanks for inputs/comments. Link to comment Share on other sites More sharing options...
Mike Gammill Posted July 21, 2018 Share Posted July 21, 2018 Haven't had any Rokkors to "yellow" but a Pentax 50mm f 1.4 Takumar that someone gave me has yellowed enough to be noticeable and I've used it with black & white. To my eye it seems to have like a pale yellow filter (much less effect than the common K2 yellow). Link to comment Share on other sites More sharing options...
JDMvW Posted July 21, 2018 Share Posted July 21, 2018 I personally tried various versions of the sunlight/UV exposure and nothing made any difference that I could see. There used to be a "repair" page for the yellowed Takumars by Brian Ayling, but that is no longer available that I can find. He used a sledge hammer to "repair" the lens.... Link to comment Share on other sites More sharing options...
davecaz Posted July 21, 2018 Share Posted July 21, 2018 I haven't had a Minolta lens go yellow, but I've had others that did. Exposure to sunlight helps, but isn't a miracle cure, It lightened the yellowing of my lenses, but didn't completely clear them. You raise an interesting point, regarding B&W. I wonder if the yellowing has the same, though probably milder, effect as a yellow filter. Link to comment Share on other sites More sharing options...
davecaz Posted July 21, 2018 Share Posted July 21, 2018 I personally tried various versions of the sunlight/UV exposure and nothing made any difference that I could see. There used to be a "repair" page for the yellowed Takumars by Brian Ayling, but that is no longer available that I can find. He used a sledge hammer to "repair" the lens.... Lol! :D Link to comment Share on other sites More sharing options...
JDMvW Posted July 21, 2018 Share Posted July 21, 2018 By the bye, in today's world, the color cast from the thorium or whatever can be corrected easily in scanned color work, and --of course-- it doensn't really do anything "bad" in B&W. Link to comment Share on other sites More sharing options...
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