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SM-4 Seeing Monitor »
The SBS SM-4 Seeing Monitor is essentially identical to the former SM-3 but with a new camera and lens. The SM-4 is based on the new high QE, low noise, QHY5III462M camera and a high quality Kowa 100mm f/2.8 lens and operated by custom seeing monitor software written by Dr. Alan Holmes. The SM-4 Seeing Monitor constantly monitors the seeing for any 12 hour period and displays the measurement on the computer monitor, logging the data to a text file for later analysis.
