The SF-1 is a k-mount camera and as such, the lenses that fit it, will fit the new DSLR's. Including auto-focus lenses. Nearly all Pentax lenses will fit the new DSLR's, some need an adapter. There are a few out there that are k mount and do not fit at all however. They would be early k mount lenses that were designed for manual-focus k mount cameras. These have an elongated shutter guide that interferes with the AF mechanism inside modern auto-focus capable k mount cameras preventing the lens from even being mounted. Some of these lenses can be adapted to fit with the removal of the shutter guide. Usually 3 small screws holding the guide in, remove the screws and the entire guide and the lenses work fine.