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Geiger-mode Avalanche Photodiodes (G-APD) bear the potential to significantlyimprove the sensitivity of Imaging Air Cherenkov Telescopes (IACT). We arecurrently building the First G-APD Cherenkov Telescope (FACT) by refurbishingan old IACT with a mirror area of 9.5 square meters and construct a new, finepixelized camera using novel G-APDs. The main goal is to evaluate theperformance of a complete system by observing very high energy gamma-rays fromthe Crab Nebula. This is an important field test to check the feasibility ofG-APD-based cameras to replace at some time the PMT-based cameras of plannedfuture IACTs like AGIS and CTA. In this article, we present the basic design ofsuch a camera as well as some important details to be taken into account.

FACT -- the First Cherenkov Telescope using a G-APD Camera for TeV Gamma-ray Astronomy (HEAD 2010)