I have a full set of these tiny Pentax 110 primes plus a Rainbow Imaging adapter for sale. All are fixed aperture at f/2.8. The 24mm lens is slightly rough around the filter thread, but given their size it's unlikely that this'll cause problems. Image quality and overall build quality are fine. The 18mm and 50mm come with front caps as well. When I get home I'll take pictures with and of them. They're fun little lenses, but I just don't find myself using them very often. PM for shipping outside the lower 48.