Definition of tele-negative in US English:

tele-negative

noun

Optics
  • A strongly diverging compound lens, especially (in later use) one which serves as a component in a telephoto lens, or which is used with an astronomical eyepiece to magnify the image.

adjective

Optics
  • Designating a compound lens of this type (chiefly in "telenegative lens"); having the property of such a lens.

Origin

Late 19th century; earliest use found in Year Book Photography. After German Telenegativ.