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I visited Hirota Shrine at Nishinomiya Taisha-cho today. Fine day supplied good enough lighting source for photograph shooting. As Minolta MD Zoom 35-70mm/3.5 lens has cleaned and prepared for testing, I could not help doing the behavior, also long deserted MD Macro-Rokkor 100mm/4 was the same situation.
The second group lens of MD Zoom had apparent a-spherical surface curvature in the rear, it was recognized while cleaning. Strictly speaking, this is not a zoom lens but a vari-focal lens, because focusing step should be done in every change of focal length, every change of picture angel.
Careful and polite maintenance procedure should be done periodically to clean every surface to establish transparency, light cloudy is the worst phenomena to reduce the picture quality, especially the cloudy exist in the Balsam layer is fatal for the lens itself.