Finally, here are som pics. Before cleaning the lens, only aperture 1.7 could be used. Now it works perfectly from 22 - 1.7. It only cost me 3 hours of work. The below pics are shot with my Konica Minolta 7d & Minolta 50mm lens, only reduced in size to fit the web.

Name:  f_1.7_250th_sec.jpg
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Size:  181.4 KB

Name:  f_5_30th_sec.jpg
Views: 151
Size:  188.5 KB