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Author Message   J.Ed Baker Rating: N/A Votes: 0 Posted on Tuesday, February 15, 2005 - 11:38 pm:    I have a Minolta mount 28-70 zoom that was sold through Sears. The problem is the aperature has become slow to operate. I suspect oil on the blades. Does anyone know who manufactured this lens and/or how to best disassemble for cleaning? Thanks