K&F Concept 55mm variable ND filter you are asking, you mentioned your Minolta 24-70mm vintage lens is 55mm, just please go ahead to purchase, please do not worry about it. as long as the lens size and the filter size is the same, then works. hope this helps. 

This is a Canon to micro 4/3 systems like the current Panasonic and Olympus models. Unless Nikon has the same mount, it will not work. 

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) 

not sure about SR minolta mounts? I have fuji X mount camera, and connected a MC ROKKOR lens using a crossover adapter FOTODIOX....not a K&F. Not sure why amazon think I have K&F? I recommend fotodiox. 

I use this to mount an m42 zenit mirror lens to an EIS R, so it should work for your m42 lens. You will have to change the settings to allow release shutter without lens as there are no data pins on m42 lenses.