Nikon HB-47 Bayonet Lens Hood for AF-S 50mm f/1.4G

Your answer would depend on which 50mm f/1.8 lens you own, as you did not list the full name or product number above. If you own the Nikon AF-S NIKKOR 50mm f/1.8G Lens, B&H # NI5018GAF, or the Nikon AF-S NIKKOR 50mm f/1.8G Special Edition Lens, B&H # NI5018GSE, then yes, the Nikon HB-47 Bayonet Lens Hood for AF-S 50mm f/1.4G will fit onto the lenses. If you own the Nikon AF NIKKOR 50mm f/1.8D Lens, B&H # NI5018DAF, then the lens hood would not be compatible; instead, you would have to purchase the Nikon HR-2 Lens Hood, B&H# NIHR2.

The Nikon HB-47 will provide the same amount of protection against flair on a DX format camera as it would on a FX format camera.

I have a 50mm f/1.4G but you are inquiring about a 50mm f/1.4D. From the research I have done, the D that you have requires a different lens hood than my G uses. I believe you need an HR-2 lens hood but please do not take my word for it and investigate this a little further. Hope this has been helpful.