Sony
https://electronics.sony.com/imaging/lenses/full-frame-e-mount/p/sel40f25g
Would the 40mm F2.5 be small enough for you?
Mirrorless with adaptors are the way to go!
I’d say post away. It helps with engagement and invokes discussion
Sony
https://electronics.sony.com/imaging/lenses/full-frame-e-mount/p/sel40f25g