Me dissatisfied? Never! I keep them all!
Seriously though...I don't know that I have ever not kept a lens that I had purchased with intent and which was not defective or damaged. I did "turn" a Tamron 28-70/3.5-4.5 (44A) that came with my Ricoh XR7. I was not pleased with its performance or build and traded it as partial payment for a CLA on the same camera.
Beyond that, I have taken delivery of several lenses that were either badly damaged or had fungus. In each case, the seller refunded or replaced. A short list includes:
- Asahi S-M-C Takumar 50/1.4 (fungus)
- Asahi Super-Takumar 55/1.8 (fungus and falling apart)
- Tokina zoom (cannot remember details on this lens)
- Jupiter-8 50/2 (Contax/Kiev mount) bad iris diaphragm
- Vivitar 28/2.5 (Kiron) (damaged by seller...botched service)
- KMZ MC Zenitar 16/2.8 Fisheye (badly defective mechanicals new from the factory)
Oh, I almost forgot the one lens that came new with my original Ricoh Singlex TLS purchased back in 1970 (my first SLR camera). It was a Rexatar 50/1.8 (bait and switch instead of the Rikenon I thought I ordered, courtesy of Bass Camera in Chicago) that never really performed very well.
Steve