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What does afocal mean?

Looking for the meaning or definition of the word afocal? Here's what it means.

Adjective
  1. (optics, of an imaging system) Not focused
  2. (optics, of a lens) Neither concave or convex (focal point at infinity)
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Examples
Examples of refracting afocal systems include an ordinary Keplerian telescope, a Galilean telescope, and a lens-erecting telescope.
The T-piece, to fit the camera for afocal photography was, made by Mr Steve Kleyn of the Hermanus Astronomy Centre.
A 3x afocal Galilean telescope has a separation between the objective and ocular lens of 2cm.

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