In-Body Image Stabilization

[Joseph Tainter]

I remain sceptical about the image quality one can get using the edge of 
many lenses. Recall the review I posted a few days ago of the DA 50-200. 
Overall it is pretty good for the price, and I would recommend it for 
most uses. It is, however, consistently just a bit weak at the edges. 
What kind of image quality would one get shifting the sensor a few mm 
with such a lens?

I assume that the forthcoming high-performance telezoom will be better 
out to the edges. Perhaps Pentax's better lenses will be suitable for 
image stabilization, but less so the lower-quality lenses.

Joe