A Focal Reducer is mounted to the 1.3m telescope. The Focal Reducer can be used in two different configurations:
1. In the imaging mode the focal length of the telescope is reduced by a factor of 1.87, enlarging by the same factor the imaged area of the sky on the CCD. A Filter Wheel with 6 filter positions is integrated to the Focal Reducer.
2. In the spectroscopy mode a reflection grating is introduced in the collimator path. Using different gratings, resolutions ranging from 0.57Å/pixel to 4Å/pixel are achievable with a 15μm pixel CCD camera. A Slit Wheel offering 6 positions with slit widths: 80μm, 160μm, 320μm and 640μm is part of this configuration.
A 2k x 0.8k CCD camera is attached to the slit spectrograph. More detailed information is available here.
Gratings for the Focal Reducer
Zero order blaze
for max. Intensity