Scripts for dithering while autoguiding are now available, with 2,3,4,5,6,7,8 positions. This is important as the dither offsets must fit into the window. We have found that the instrument focus is stable and should not change with either temp or filter. Be aware with the direct TV that the handset directions are turned 45 degrees. Don't worry, just center the stars on the rotator center.
Observers usually define apertures for their dither and offset sky exposures.
Due to the high data rate, the nightlog processing can in certain circumstances take some few minutes. If a time-out occurs while processing the log, please use the safelog option. To do this, get a DDS3 tape. Open an xterm and change directory to the directory containing the data you want to be written to DAT tape. The attachment shows an example.