Last week I went to the "bay" and bought a lens, as a Buy It Now, that I have ALWAYS wanted, the Pentax SMC-M f:2.8/40mm "pancake" lens, possibly the most compact lens ever made for a 35mm SLR in the old days.
Mounted to this Pentax K110 D, it makes a nice easy to carry combo. It is not an "A" lens, having no extra contacts in the mount to communicate f:stop settings, so with the digital body it must be shot either wide open at f:2.8, or in Manual mode, re-calculating exposure values when shot at smaller apertures.
I gave it a test here at home.

Please click on thumbnails to see enlarged.
All images are ©2021 E.J.Kowalski.
Thanks! Ed