LeesKeys

I have a copy of Tamron’s 150 - 600mm G2 lens. It has really good image quality and is easy to use. I have heard the one you are asking about is similar. Will you be able to test it?
The only drawback for me with my lens is after carrying it around for a while, it gets heavy and so on the tripod it goes. Also, it was not a FX mount lens, so I use a Fringer smart adapter, but that has never been a problem.

I have the new XF 70-300mm on order and am trying to decide between the 1.4 and 2x converter. I will be using lens + converter mainly for wildlife/bird photography. Yes I know that the 2x will drop my max aperture by 2 stops, and the 1.4 by 1 stop. I'm wondering if any one has actual hands-on experiences with these converters. I would love to hear your observations.

Received mine a couple of days ago. This is going to be a great lens for macro as well as bird photography (have the 1.4x converter on order). This is a shot I took yesterday with the XF70-300 (0vercast, late afternoon) at 300mm from minimal focus distance (about 2.5 ft). On tripod, ISO 2000, F/10, 1/450s
Photo here