Manual focus lens. "The Minolta MD 100 mm 1:2.5 is one of the best manual lenses I have reviewed. It is very sharp with pleasant bokeh and since it is just 310g I don’t hesitate to actually carry it with me unlike some other very nice lenses which I often leave at home because of their weight. Other lenses are often either very good as a landscape lens or a portrait lens but the Minolta performs very well in both categories. I see no serious drawback of the Minolta but of course there are a few things it does less well. The axial CA is a weakness of nearly any short tele lens and not much of an issue for most applications like portrait or landscape. Then there is the issue of the 6 straight aperture blades which can be bothering if you shoot for example portraits at f/4. Since the Minolta is very good from f/2.5 and I am a sucker for shallow depth of field I rarely do that but YMMV. At about $140 the Minolta MD 100 mm 1:2.5 offers great value if you ask me. Sure it isn’t super fast but usually fast enough and it performs better than most faster lenses and it’s handling is superior as well so I got many good images out of it and I bring it with me very often." https://phillipreeve.net/blog/review-minolta-md-100mm-12-5/