I bought a 2.2x extension for my camera while abroad. It seemed to work fine in the shop, but has let me down badly when trying to take wildlife pictures, as they come out in poor definition.
The lens is one of these: https://www.amazon.com/72MM-High-Definition-2-2x-Telephoto/dp/B001V5UMLU
Is it worth trying to do anything with this (user error), or just cutting my loses?
I have a good Tamron 28-270mm and I'm now thinking of supplementing this with a 150-600mm either Tamron or Sigma. Any advice?