I have two Tamron 150-600mm lenses. Both purchased new from Don's photo in Wpg. One is a Gen #1 and the other in a Gen #2 ... I will sell either one as I can't tell the differance is picture quality from one to another. If you phone I will explain why I purchased the Gen #2 From what I see on E-Bay Canada the Gen #1 goes for 900-1,200 and the Gen #2 goes from 1,400-1,600. I will make it a good deal for you on either lens. I could also reduce the value off the lens of your choice by 500 dollars for giving me a few hours of your time to help me understand my Adobe Lightroom Classic file managment. I live in Wpg Beach so if this would be of interest give me a call at 204-223-3780 .... I will also sell one of the lenses without Lightroom support.