That's pretty cool Jeff. I have both of those tc's and never thought to stack them. Does the camera know what's going on or do you have to give it a little help?
Actually, it's a 2x factor - you can't get something from nothing.
One 1.4x TC looses 1 stop. Adding another 1.4x TC looses another. With the 300/4 you end up with 600mm f8.
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