If you are using LR3 (not sure about older versions) have you checked your Profile, under the Camera Calibration menu in the Develop Module ? Try changing it to the other options available to see if this gives you something similar to what you see on the screen on the back of your camera.
|Arch-itecture by Nilesh Trivedi|
from Random Items - Challenge #30
|Rocky Mountain Elk by evancj|
from Odds are...