The two types of electronic detector available on La Palma are
a range of Charge Coupled
Devices (CCDs) and the Image Photon Counting System (CCD-IPCS). These
are described in Sections 
and
respectively. The CCD-IPCS is available only at the WHT, where it is
an option on the UES, the blue arm of ISIS and on TAURUS. A strong case
would have to be made for using the IPCS for a particular application, since
low noise, thinned, Tektronix CCDs are available at all three telescopes.
Section discusses how to decide which detector
is best suited for a particular application.