I just traded an old iMac with some screen issues for a bag of old lenses. For K-mount and OM mount. I have an OM to NEX adapter. I'll have to get a K-mount adapter, but I also have an ME Super, so that's OK, too. OM: OM 50mm 1.8, but the aperture ring is a little wiggly Soliger brand 2X teleconverter for OM JC Penny brand 28mm 2.8, but the aperture blades don't work. So that'll be a fun project. Crazy close focus and nice bokeh though. K-Mount 135 2.5 Takumar. Feels like a very nice lens. I'll have to research it a bit. This lens here: Takumar 135mm F2.5 Bayonet Reviews - Non-SMC Pentax Prime Lenses - Pentax Lens Reviews & Lens Database Pentax 50mm 1.7. I'll try this against my 50mm 2.0 edit: drat: just noticed there's some minimal fungus Well now I have a cleaning job to do! Makinon 28mm 2.8. with a 52mm screw-in rubber hood. A couple of lens cases and a nice sized lens box. The computer was probably worth $100-150, so I think it was a fair trade. I'm going to keep old lenses I come across, because I think a FF interchangeable mirrorless is not that far away, and the 28s will be fun to play with, as will a 135/2.5.