Telescopic magnification

The scanner found in the casings of advanced Grey Daleks not only had Z-ray and X-ray vision, but also telescopic magnification, as discovered by the Space Intelligence Service. (NOTVALID: Inside a Dalek)

Behind the scenes

 * Inside a Dalek (which is not, on its own, currently considered a valid source on this Wiki due to not being a story) saw Dalek creator Terry Nation putting the name of "telescopic magnification" on the oft-observed capacity of the Dalek eye-lens to zoom in and out of focus on items and individuals, as seen in many televised stories.