What is the best compatible portrait lens good for Nikon D750 and price under 500 box?

What is the best compatible portrait lens good for Nikon D750 and price under 500 box?

Ask a camera shop

500 box? What currency is that?

You probably won't do much better than this one, with black friday reduction.

What I'd do to figure this out would be to first go to sites like adorama.com or bhphotovideo.com and get a list of portrait lenses under $500. Then I'd go to opticallimits.com and compare the optical qualities of the various lenses.

Part of choosing the "best" lenses for you is to first decide upon whether you want a prime or a zoom. For some users an 85mm will be "best" for them. While others prefer the added versatility of a zoom such as a 70-200 f/2.8. For me, I'd take a 70-200 f/2.8 over a prime. If you prefer a prime for whatever reason, as there are good ones such as sharpness, better control of distortion and usually primes have larger apertures, then you may want an 85mm. Others may want a 150mm for it's additional compression of the perspective which creates a more flattering rendition of the human face than an 85mm can.

So with this in mind, I'd say either a 150mm prime or a 70-200 f/2.8. But neither are going to be under your $500 limit. Which means that you may want to consider a 135 f/2 from Samyang or a 135mm f/2.8 from Mitakon. Or a used 70-200 f/2.8 from Tamron or Sigma.

Even a kit lens set to 55mm will take great portraits if the user is skilled in composition and lighting.

I assume 500 box = 500 bucks = 500 USD.
A 100mm (or something close to 100mm) f/2.8 macro is well within your price range. The Tokina 100mm macro is $400 at full price.

A good place to start with a lifetime expectancy, the Nikkor 50mm f/1.8D is an excellent place to start. Inexpensive, remarkably sharp, and a good focal length.