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An established technique for the measurement of ultra-high-energy-cosmic-raysis the detection of the fluorescence light induced in the atmosphere of theEarth, by means of telescopes equipped with photomultiplier tubes. Siliconphotomultipliers (SiPMs) promise an increase in the photon detection efficiencywhich outperforms conventional photomultiplier tubes. In combination with theircompact package, a moderate bias voltage of several ten volt and single photonresolution, the use of SiPMs can improve the energy and spatial resolution ofair fluorescence measurements, and lead to a gain in information on the primaryparticle. Though, drawbacks like a high dark-noise-rate and a strongtemperature dependency have to be managed. FAMOUS is a refracting telescopeprototype instrumented with 64 SiPMs of which the main optical element is aFresnel lens of 549.7 mm diameter and 502.1 mm focal length. The sensitive areaof the SiPMs is increased by a special light collection system consisting ofWinston cones. The total field of view of the telescope is approximately 12$^\circ$. The frontend electronics automatically compensates for thetemperature dependency of the SiPMs and will provide trigger information forthe readout. Already for this prototype, the Geant4 detector simulationindicates full detection efficiency of extensive air showers of$E=10^{18}\,\text{eV}$ up to a distance of 6 km. We present the first workingversion of FAMOUS with a focal plane prototype providing seven active pixels.

Status of the Silicon Photomultiplier Telescope FAMOUS for the Fluorescence Detection of UHECRs