This is possible if you don't have a suitable adapter ring. However, when reducing larger lens diameters, caution is required because of possible vignetting. 

This is possible if you do not have a suitable adapter ring. However, care must be taken when reducing larger lens diameters because of possible vignetting.  

Yes but you have to order them from k and f directly. The Uk branch has them 

I doubt it: not because of their diameter, but because they are super- slim so no obvious place for a lens cap to attach to. This said, they screw on and off with minimal effort, so I take them (and the filter system off) off before transporting the camera to a new location. 

Could you please update us your full Minolta lens model ?as Minolta has MD MC and AF mount, K&F Concept MD-M4/3 is suitable for: Lens: Minolta MD MC Mount lens(not for Minolta AF mount: KF06.157) Camera: Micro 4/3 (MFT) mount mirrorless camera like Olympus PEN, OM-D series, Panasonic Lumix DMC-G1, G2, G3, G10, GX1, GH1, GH2, GF1, GF2, GF3, GF5, GH4, Panasonic AG-AF100 Mirrorless Digital Cameras, Black Magic Pocket Cinema Camera (BMPCC)