  Telescopes -- far seeing -- have since centuries revealed insights to objects
at cosmic distances. Adopted for gamma-ray-astronomy, ground based
Cherenkov-telescopes image the faint Cherenkov-light of air-showers induced by
cosmic gamma-rays rushing into earth's atmosphere. In the race for the lowest
possible energy-threshold for cosmic gamma-rays, these Cherenkov-telescopes
have become bigger, and now reached their physical limits. The required
structural rigidity for image-quality constrains a cost-effective construction
of telescopes with apertures beyond 30 meter in diameter. Moreover, as the
aperture increases, the narrower depth-of-field irrecoverably blurs the images
what prevents the reconstruction of the cosmic particle's properties. To
overcome these limits, we propose plenoptic-perception with light-fields. Our
proposed 71 meter Cherenkov-plenoscope requires much less structural rigidity
and turns a narrow depth-of-field into three-dimensional reconstruction-power.
With an energy-threshold for gamma-rays of one Giga electron Volt, 20 times
lower than what is foreseen for the future planned Cherenkov-Telescope-Array
(CTA), the Cherenkov-plenoscope could become the portal to enter the sub second
time-scale of the highly variable gamma-ray-sky.
  Also, this doctoral-thesis contains a second part on the prospects of
single-photon-perception in Cherenkov-astronomy.
