Headshotzx wrote in post #6427612
Fact #4: Image quality will not be that good, considering that 400mm on the lens isn't very good (subjective, ymmv) already.
"considering that 400mm on the lens isn't very good (subjective, ymmv) already."
This was taken with a 1DM2 + 100-400 at 400 mm, wide open and hand held. I've printed it to 20"x30" for a museum exhibit, and feather detail is still very good when seen from 10 inches away. I won't hesitate to print it to 24"x36" if necessary.
Processed 100% crop (EXIF intact):
Here's the 20"x30" print on the museum wall (the smaller ones are 12"x15"):
For a sense of scale, here are other 12"x15" photos being mounted in the same museum exhibit: