Imaging

Some basic statistics were done on all the image data taken with ALFOSC in the UBVRI filters. These are seeing values based on raw frames analysed using SExtractor. The data has been taken between April 2007 and November 2013, and the results can be found at

http://www.not.iac.es/weather/seeing/alfosc_see.html

For data within air-mass $<$1.74 (lower hatch limit), with exposure time longer than 70 seconds, with more than ten stars detected in the frame, and excluding data with extreme telescope focus values (likely being out of focus images), we find raw median seeing values of 1.18", 1.04", 0.86", 0.89", 0.82" in UBVRI, respectively.