yes, I'm using it on the same a6000 camera :) 

You need a Minolta AF to Sony E/NEX adapter. The MD/MC Minolta mount is different from the AF mount, so the AF lenses don't physically fit the MD-NEX adapter. 

Yes, I used it with my A6000 for a few months now and it's perfect. 

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) 

As Variable ND it is suitable for any lens with filter size 72mm (or with step up and step down rings to other sizes). The filter itself is light, my only suggestion would be to go for 77mm and use step up rings to use the centre of the filter for better quality.