Is the pentax hd d fa 85mm f 1 4 ed sdm aw good on aps c?

Yes, it works well on APS-C, but it behaves like a longer lens there. The Pentax HD D FA* 85mm f/1.4 ED SDM AW frames like about 128mm on full frame, so it's a tight portrait and short telephoto. You'll need room to back up. The f/1.4 aperture gives roughly the depth of field of f/2.1 on APS-C, so backgrounds blur nicely. If you want the reasoning behind that, see sensor sizes.

Good APS-C bodies to pair it with from the catalogue:

• Pentax K-3 Mark III, my pick if you want the most camera for it.
• Pentax KP, a strong all-rounder.
• Pentax K-70, if you want to keep the budget down.

Written by Claude from this site's pages.