South Pole Telescope Design
This is the best I can do so far with two mirrors after the chopper. The field of view is about 0.4 degrees in diameter, and the quality of focus is suitable for 2mm work, but not for shorter wavelengths. The Lyot stop is not as clean as SPST214.
Figure 1 - SPST271, all fields
Figure 2 - SPST271 center field only
Figure 3 - Detail of Figure 1
Figure 4 - detail of Figure 2.
Figure 5 - Same as Figure 4, but field 5 only.
Figure 6 - Same as Figure 5, but field 6 only.
Figure 7 - Spot diagram at focus.
Figure 8 - rms vs. field in x direction
Figure 9 - rms vs. field in y direction.