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The Minolta AF 28-135mm F/4-4.5 was one of the first few lenses Minolta came out with when they switched over to the AF mount around 1985. 



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Optical configuration; 16 elements in 13 groups



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The Minolta AF 28-135mm lens is described in various internet chat rooms as the "secret handshake" lens, because long ago, a couple of idiots got suckered into believing Minolta produced this lens, and sold it at cost as a "thank you" to the loyal Minolta customers of the day. 



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More about the lens at; http://kurtmunger.com/minolta_af_28_135mmid56.html