Scruples wrote:
To me, having both lenses may be excessive. Perhaps, sell the 100-500mm lens because of the redundancy. I might keep the converter but I don’t know the f-stop on either lens. Perhaps you could give a little more info about the lenses and converter. If you intend on selling a lens a photo may be helpful. If not for the money,you may wish to donate the lens to a photography club or High School. You can get a decent tax donation!
I was using the 100-400 Z lens with a 1.4 TC before I got the 180-600 Z. The 180-600 is great but there’s no way I’d get rid of my 100-400. It’s my go to if I’m shooting some place like a garden. It gives me more flexibility if I need reach and the close focusing ability gets me to almost macro.