A light plastic lens such as the 45mm f/2 Rokkor-X might seem out of place on a large and heavy body, but it's common to find them on used Minolta SRTs-- whether they were sold that way by a dealer or by the seller of the used camera, I don't know. The lens itself has a good reputation among Minolta users. Though I own one of them, I've only recently started to use it regularly. Its small size doesn't seem much of an issue except for making it a little easier to move the aperture ring unintentionally while focusing, particularly in cold weather when fingers aren't as sensitive. That's a minor problem to deal with if you like the results - which I do. Anyway, I posted some b&w photos from this combination here in May; now I have some which show what it can do with color. The film was Kodak Gold 200 commercially developed and scanned. The 2nd and 3rd photos have been cropped.
Birch Scene at Carpenter Nature Center
Bending Branch with Berries along Minnesota River
Dry Plants and Tree Bark