When I got the 100-400 yesterday, I also picked up the 1.4x teleconverter to go with it.
With this teleconverter, the lens is turned into a massive 140-560mm f/5-8 super zoom. I can’t imagine how using this lens with the 2x would be!
So, after happy hour tonight, I took the lens out and shot some images of the moon, for comparison to the one shot yesterday with the teleconverter. You can see the difference in the size of the disc yourself. (I still need more practice shooting the Moon to get the exposure right.)
The other thing that was pretty amazing was that I was able to shoot Jupiter (which was in conjunction with the Moon tonight) and see the moons on the image! No scope, no nothing extra. I am shocked! I need more practice, and to figure how best to do this regularly, but with a dark sky (which tonight wasn’t), I bet shooting Jupiter and it’s moons would be easy pickings.
Obviously, f/8 at 560mm means that a tripod is helpful, although the IS helps with that, and it means that a lot of light is needed, but…. wow!