Ond\u0159ejov Echelle Spectrograph (OES) is a fibre-fed high-resolution spectrograph. The wavelength coverage of OES is from near UV (3753 \u00c5) up to near IR (9195 \u00c5). The resolving power is R=51600 (at 5000 \u00c5) and R\u223c40000 (in H\u03b1 region). The spectral sampling is 2.4 \u00c5\/mm. The spectral range is covered by 56 usable orders. The number of spectral orders range from 92 to 36.<\/p>\n\n\n\n
Single order or coud\u00e9 spectrograph works in the first and second spectral orders. Wavelength coverage of the second order is 4000-5100 \u00c5 (near UV and blue) with order length of 233 \u00c5; wavelength coverage of the first order is 5100-8900 \u00c5 (red and near IR) with order length of 470 \u00c5. Resolving power is \u223c13 000 in H\u03b1 spectral region.<\/p>\n\n\n\n
The photometric camera is installed in the primary focus. The effective focal length in corrected primary focus is 7 m (focal ratio to f\/3.5). The automatic exchange of the instruments between spectroscopic (fibers) and photometric (primary focus camera) configuration can be done within 1 minute. The camera is equipped with five position rotating filter wheel with different filters and cooled up electronically. <\/p>\n\n\n\n