I have a chance to get a nice used Canon 1.4 II TC for the same price as the Kenko 1.4 pro 300 DGx. I'm not worried about weather sealing, as I don't really shoot much in the rain. It will be mainly to increase the range on my 70-200 F4 IS for getting a little closer to the birds that sit on the branches around my feeders that are about 25 ft from me. I can get some nice shots, but I'd like to fill the frame a little bit more. Other info.. I use a Canon 60D and I mount on a tripod with a wired trigger with mirror lock-up.
I know their will be a loss in image quality, but is one better than the other for the least amount of loss?
Thanks in Advance,