The optical layout of the WHT is shown in Figure 
.
Tables and
give the optical characteristics of the Prime,
Cassegrain and
Nasmyth foci.
Spot diagrams and vignetting curves for the f/11 focal stations of the WHT
are given in Figures and
. Spot diagrams for prime focus at various
positions of the Atmospheric Dispersion Compensator are given in the
WHT Prime Focus and Imaging Manual. A more detailed optical description
is given in La Palma Technical Note 9.