WideFastCam
WideFastCam
![WideFastCam WideFastCam](/sites/default/files/styles/crop_cinemascope_48_17_to_1920px/public/images/installation/imagen_defecto_197.png?itok=gVj__jPT)
The effective focal ratio of the primary mirror is f/2.8, and the unvignetted field of view is 40 arcminutes. When not operating at prime focus, a convex hyperboloidal secondary mirror, made of Zerodur, 1.0 m in diameter, directs the light through a central hole in the primary mirror to the main instrumentation mounted at the Cassegrain focus beneath the primary mirror cell.