Welcome ... I would suggest a Pentax M42 adaption ring and shoot Takumars !
Excellent value and I do not need AF that often ... but have some when necessary.
SMC Takumar 35mm f/2, my Single Challenges lens, here =>
SMC Takumar 35/2 | Flickr
Also, there is legacy glass in Tamron Adaptall-2 lenses ... again all manual, but with a PK/A adapter, they shoot like "A" series manual Pentax lenses ... aperture controlled via the body settings.
Here's an album for the Tamron SP 17mm f/3.5 which was last month ... =>
https://www.flickr.com/photos/139020494@N02/albums/72157676206989434
I am a big legacy glass fan, so if you want more info, just PM (Personal Message) me ... Cheers, J