Yes, use the 67mm ring to attach accessories 

hello if your nikon camera is af mount, yes, you could make the sigma 70-200mm f/2.8 ex dg apo hsm large aperture macro zoom lens work with canon with this adoptor 

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) 

This antenna will receive over the air (OTA) HD TV. I cant speak to your tv but I dropped cable 13 months ago. With Amazon prime you will receive a whole bunch of content. With HDTV you need a fair amount of band width to avoid buffering. You will probably also want an over the air digital video recorder (DVR) unless you are willing to put up with adds. I use Tablo. There is a whole bunch of minutia on how to get what you want but my house entertainment went from $250 down to $95 a month . Good Luck it is worth the savings don't pirate anything. Jim 

I am using very similar lenses and it works great. I use an a7s which has the same mounting system as the a5k.