Pentax K Mount
Does the price match the performance?
This 100mm f/2.8 macro is as small as they come, so how is it as a general purpose lens?
This classic 55mm f/1.4 lens is supposedly for APS-C, how does it do on full frame?
How does this classic Pentax wide angle lens hold up on the Sony A7?
So this lens has a legendary status, is it well deserved?
Another old wide angle that is about the same size as the OM, is it as good?
How does this cult classic wide-standard lens perform on modern APS-C Cameras?
Another old standard focal length macro (short telephoto on APS-C); pretty much every manufacturer had a standard focal length macro in the f/2.8-3.5 range.