Originally posted by aslyfox what are your photographic interests?
Macro
telephoto
portrait
land scape
your choice of lens, and the opinions of other members might depend on that
I enjoy parts of all of them - I'm currently interested in astro, but I love macro when woods hiking, and landscape when you can find it in Indiana.
I have a boatload of lenses now that will do most of them, namely:
1. Tamron Adaptall-2 SPs 60-300 and 70-210; both good MF macro lenses, as well as great TP zooms;
2. SMC Pentax-DA L 55-300mm F4-5.8 ED;
3. SMC Pentax-DA 50mm F1.8;
4. SMC Pentax-DA L 18-50mm F4-5.6 DC WR RE
5. Vivitar 28mm wide-angle, f/2.8
6. 28mm f/2.8 Promaster Spectrum 7
7. Sigma Super-Wide II 24mm f/2.8
8. Tamron 55BB 500mm mirror
9. Takumar 55mm f/1.8
10. Soligor 450mm f/8
11. Tamron SP 28-75mm f/2.8
12. SMC Pentax-DA 18-55mm F3.5-5.6 AL WR
13. SMC Pentax-DA L 50-200mm F4-5.6 ED WR
The places where I seem to be lacking are a good ultra-wide angle prime or zoom and an AF macro;
I plan to sell # 4, 5, 9, 12, and 13, soon, to free up some home space.