Originally posted by MikeD listen to Nass he is the Pentax forums macro guru.
I've learned a lot from his website over the years.
Originally posted by donlass Used Pentax Macro 50mm f/2.8 SMCP-A Manual Focus Lens B&H Photo
My first "macro" lens. Is not 1:1, but 1:2.8. I think the B&H price is a bit high. Average price in PF
review is
$151.57. Perhaps they are harder to find since K-1 came out so price is higher? I've not researched A lenses for a while. I don't think you can find anything lighter, though. It's a nice lens. I got it because it was all I could afford, and it served me well.