I inherited my uncle's old Pentax camera and from reading on this forum found out I could use it on my Oly cameras. Researched what kind of adapter to use and all that and purchased one off ebay. Turns out that this ole Ashai SMC 55 takes the K mount so went and got one of those. Now i've got an extra M42 adapter and I'm finding I'm really enjoying playing with manual lenses. Really liking this lens too btw. So.. now I thought I'd ask the collective wisdom of what lens to get next that might be able to use the M42 that I've got sitting around anyway.