Measurements with CCDInspector indicated that collimation was
now very good. Notice that the collimation error measured here
is 0 (for full disclosure, I ran three sets of test images, focusing
between each set; this measurement was the best, with the other
sets measured at 1" and 1.5". The differences may be due to
slight differences in the steadiness of the atmosphere during
each of the test sets, or differences in the quality of focus).
With 0 collimation error measured, I'm not sure why the display's
colors seem to be so de-centered (compare this with the previous
CCD Inspector image in this gallery, where the collimation error
was measured at slightly more, but the color of the image is much
more even).
See the next image for a measurement of the field flatness.