The 135 mm F3.5 Pentax M lens is not to be sneezed at, dealer price in near-mint condition should be 40 - 50. I particularly like the Pentax 200 mm f4 M lens - I had one that was great, sold it, regretted it, and bought another that was equally great. One will probably cost 60. For about half this cost, lots of zooms by Tamron, Sigma, etc.