Optical Layout
- WFCAM uses existing primary mirror - entrance pupil
- New secondary mirror
- Hyperbolic
- Gives ~f/9 intermediate focus
- Diameter 474mm
- Field lens at intermediate focus
- Bi-convex
- Re-images primary mirror onto cold stop
- Diameter 585mm
- Aspheric corrector plate
- Plano one side, weak aspheric profile on other
- Similar to a Schmidt plate
- Diameter 433mm