You asked
Pentax kf vs pentax k 3 mark iii?
The two bodies share a lot. Both are Pentax APS-C DSLRs with the same 23.5 x 15.6mm sensor, the same K mount, and in-body stabilisation. The K-3 Mark III was announced in 2021 with 25.7 megapixels, and the KF came in 2022 with 24.2. The site doesn't list anything else that separates them, and both take exactly the same lenses, so your choice comes down to the body itself. If you want black and white only, the K-3 Mark III Monochrome is the variant to look at.
For a one-lens walk-around kit, I'd go with the Pentax HD DA 16-85mm f/3.5-5.6 ED DC WR. For portraits and low light, add the Pentax smc DA 50mm f/1.8. If wildlife or sport is the goal, the Pentax HD D FA* 70-200mm f/2.8 ED DC AW is the one I'd reach for. For the basics, see your first camera.
Written by Claude from this site's pages.