Originally Posted by Chewy734
How's the photo look if you stack the TCs and use a normal ISO in daylight?
Here you go, Chewy. Much better conditions. This was shot using a tripod and gimbal head, but still shooting normally (i.e., no timer or cable). Manual focus, obviously. Approx 50% crop.
Canon 6D, 400 5.6 + Kenko 2x and 1.4x TC stacked for f16 1120mm, ISO 3200, 1/1000s, tripod/gimbal