2nd best Nikon full frame lens next to the Nikon 24-70 f/2.8?

2nd best Nikon full frame lens next to the Nikon 24-70 f/2.8?

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I just bought a Nikon 50mm f1.2 lens. I have heard/seen people say I will need an adapter for it, why and what adapter?

I have a Nikon d750

Read more: I just bought a Nikon 50mm f1.2 lens. I have heard/seen people say I will need an adapter for it, why and what adapter?

Wildlife Camera Upgradation?

I currently shoot wildlife, mainly birds using my Nikon D5300 w/d Nikon 200-500mm F5.6E. I'm satified with the results. But the problem I'm facing now is that my camera s autofocus & lack of controls to change settings. I'm considering Nikon D7200 or Nikon D500. I'm not going to sell my exisiting body though, but anyone can help me with this?
Thanks.

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