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 

Yes. I have the same lens and adaptor on my Sony a7ll and it works beautifully. The m42 is also known as the 'universal' mount as other 3rd party camera and lenses also used it. I own 6 other K&F e-mount adaptors to different lens makers (ltm, MD, CF/CD, Nikon) and they all are well built with a nice snug fit. Highly recommended. 

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 actually have not received this adapter yet. It's shipping from China. Don't think that was disclosed in the ad. However, I do not believe this is for the Pentax Q body rather for digital and film cameras that take the Pentax K mount in its many variations. So I'm expecting to be able to mount my Leica M mount lenses on my digital and film Pentax K mount cameras, no autofocus or relay of exposure information, only to be used with manual focus and exposure. 

HI your fujinon m42 55mm 1.8 and a sigma-z m42 135mm 2.8 are M42 mount, the item can fit your camera and lens