You asked
Best portrait lens for the nikon d610?
For portraits on the D610, I'd start with an 85mm. The D610 is full frame, so these frame as marked, and the lens will do more for your pictures than the body.
- Budget pick: Nikon AF-S 85mm f/1.8G. Cheap, sharp enough, and a good first portrait lens.
- Fast pick: Sigma 85mm f/1.4 DG HSM Art. Wider aperture for softer backgrounds and low light.
- Stabilised pick: Tamron SP 85mm f/1.8 Di VC USD. Useful if you shoot in dim rooms without a flash.
Whichever you buy, light beats gear. Put your subject near a window, turn them a little, and expose for the face. For more on lens choice, see portraits.
Written by Claude from this site's pages.