Canon 300mm f4 IS + 1.4x, Sharpness test with a 20 Euros note

Hello,

For those who are interested I made a sharpness test with my Canon 300mm f4 IS and my recent aquired 1.4x.
I used a 40D on a tripod, a 20 euro note and set the camera settings to 0 (Contrast : 0; Sharpness : 0; Color saturation : 0; Color tone : 0).
These are 100% crops of the center with no post processing!!!!!

Well, I'm quite impressed with the results, because I see a little improvement from 5.6 to 6.3, and from 6.3 to 8.0 it is almost identical with excelent detail. Remember that there are no post-processing and camera settings are all 0.

On the last image I post an example of one with these camera settings (Contrast : 0; Sharpness : 3; Color saturation : 0; Color tone : 0), just to see how good could it get with a litle sharpness.......

Any comments?
http://pauloanjo.com.sapo.pt/7856.jpg

f5.6

http://pauloanjo.com.sapo.pt/7857.jpg

f6.3

http://pauloanjo.com.sapo.pt/7858.jpg

f7.1

http://pauloanjo.com.sapo.pt/7859.jpg

f8.0

http://pauloanjo.com.sapo.pt/7857sharpness.jpg

f6.3 with camera sharpness set to (3)