Best lens for portrait photography on nikon d750?

So i'm planning on buying a new camera that is nikon d750 but i don't know which lens should i go for right now i have a tamron 24-70 2.8 g on my nikon d7200 and i'm not satisfied with the pic quality so i'm going for a nikon d 750 with a nikkor 85mm 1.8g and my question is that should i sell my tamron lens along with my nikon d7200 or should i atleast keep the lens and use it with the new camera (d750) or should i sell it and buy a new lens?

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Is Nikon a publicly traded company? If not, why do some photographers promote it so shamelessly and zealously?

Is Nikon a publicly traded company? If not, why do some photographers promote it so shamelessly and zealously?

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How long does a nikon D5000 battery have to charge?

How long does a nikon D5000 battery have to charge?

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The flash in my Nikon D800E works only when the liveview is off. Why?

The flash in my Nikon D800E works only when the liveview is off. Why?

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How do I use the display screen on my Nikon D3000 camera to take a picture?

I received a Nikon D300 Digital Camera for Christmas. It is a FANTASTIC camera but I can only use the viewfinder to take a photo. I would LOVE to be able to use the display screen to take pictures. Can you help me?

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How to photograph of an interior neon sign?

I own a nikon d5500. And I want to take a shot of my neon sign in my room. I tried in low ISO and high shutter speed but the result was not satisfying since it may reduce the neon glow but remain the neon surroundings (entire room) so dark.
what adjustment do i need to take a shot of my neon sign while the entire room is still in normal light?

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Cual camara me recomiendan para tomar fotografias la Nikon D5500 o la Canon EOS 70D?

Quiero comprarme la mejor camara de estas 2.

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Body only or with kit lens?

If I have a nikon 50mm 1.8g prime and a sigma 17-50mm f2.8, should I get a nikon 7100/7200 with kit lens (if yes, 18-140mm or 18-105mm?) or save $200 and get the body only?

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How to change picture from black to color?

I was taking photos with my Nikon d7200 camera and my teacher accidentally changed a setting without me knowing. I start taking pics with them and I realized a few minutes after they were just coming out as black. The photos were really important (from a baby shower that we can not recreate) and I was wondering if anyone had ANY ideas how to change the black photo to possibly color? Really desprate
Added (1). Just clarifying, when I mean black I mean the photo is completely black. Like you can see absolutely nothing, it is just a blank black screen. There is a little bit of light at the top like thats it

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Can't shoot at 1/4000 sec?

I have a Nikon d5300 with 18-55mm and 70-300mm lens. I wanted to capture water droplets, I tried using a flash but I get a black background on the pic. My camera doesn't have the option to change the flash sync speed. I can only shoot at 1/250 using flash. What do I do so that I can click on 1/4000sec.

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