I don't think Minolta made a MD to A mount adaptor.
Unfortunately they didn't. I suspect they knew that only a small percentage of Minolta SLR users would want to use their Rokkor lenses on Maxxum cameras, and Minolta wanted to sell Maxxum lenses, too. (When the Maxxum cameras & lenses hit the market in 1985, Minolta shifted its manual-focusing SLR camera and lens production to China (mainly, Seagull). There are several Rokkor-Maxxum converters made by other companies -- some without any glass, and some with (of varying magnification & quality). I've never seen a comprehensive comparison of all the options.
For my Rokkor-mount lenses, I have a glassless Maxxum converter that I use for close-up and macro work, and a 1.2X glass converter that works at long distances with my long lenses (300mm and up) that focus passed infinity. As with any tele-converter, the trick is to stop down to get the best quality -- and if the prime lens is top-notch, the results will probably be very acceptable.
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