The Chromospheric Telescope
  We introduce the Chromospheric Telescope (ChroTel) at the Observatorio del Teide in Izana on Tenerife as a new multi-wavelength imaging telescope for full-disk synoptic observations of the solar chromosphere. We describe the design of the instrument and summarize its performance during the first one and a half years of operation. We present a method to derive line-of-sight velocity maps of the full solar disk from filtergrams taken in and near the He I infrared line at 10830 \AA. 
C. Bethge, H. Peter, T. J. Kentischer, C. Halbgewachs, D. F. Elmore,   and C. Beck
astro-ph.SR