I'm considering adding a telephoto zoom to my lens kit, but not sure which one to get. I'm very much keen on doing occasional wildlife and bird photography, but it's not something I necessarily get to do that often. That's why I was thinking that the 50-140 is a more versatile lens for day-to-day use and that, with the 2x teleconverter, it would be sufficient for wildlife. Has anyone got experience with the 50-140 + 2x tele-converter? What's your experience with the picture quality and the auto-focus? Is this thinking just silly and I should simply save up for the 100-400 instead?
Thanks!