Lindy Stone , Sep 02, 2007; 11:37 p.m.
I think pentax film plane distance is 45.56mm~ish and minolta md is 43.5mm. So you cannot use your md glass on Pentax k or screw mount without adding a glass filled adapter, which does not exist yet, and your md mount glass would have to bury itelf inside the pentax lensmount to get closer to film plane. There are numerous optical adapters that are 1.1x for md on alpha. This may be your better option. I've seen a link recently on minolta forum that had some very nice pix taken with 1.1x adapter and 50mm 1.2 via sony alpha.
I'm new to minolta having only bought 4 md items in last 2 weeks. I'm trying to cobble these macro items to eos or pentax for non infinity focus macro use and I'm not able to make the adaptation via minolta autobellows III (yet). I've picked up autobellows III with its radical tilt shift capabilities, 100mm autobellows lens and 12.5 and 25mm microscope lenses once I tried out the macro lenses on my Fd system via adapters. Great glass as it should be since its cloned Leica micro glass. Since none of these items rely on specific film plane distance I expect I'll be able to use them on anything eos or pentax with multiple adapters. But I will see if my impulse bought lot of new in the box goodies will work for me while having no clue about minolta's earlier system pre autofocus or different mount autofocus system. Its been fun learning about MD lately.
Sony has a couple dslrs due out buy feb 2008. One is likely a full frame dslr. So 1.1x adpater filled glass on sony full frame would offer great opportunities to you if your budget will allow it.