Although the off-axis mirrors introduce significant
aberrations, the images are still diffraction-limited at 2 
m across the
entire 12'' field at 0.05 ''/pixel. The aberrations are more
significant with the 0.08 ''/pixel image scale particularly in the J band,
but as a diffraction-limited image cannot be fully sampled with this pixel
scale, the images are completely adequate. Encircled energy plots are
shown in Figure 10.
Figure 10: Encircled Energy diagrams for Martini