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The Simmons Camera (formerly from the Mayall RC spectrograph) is of the Cassegrain Mangin-Mirror Maksutov type, employing two corrective meniscus lenses. The focal length is 381 mm.
The throughput of the Simmons Camera is flat at 45%. This crosses the expected throughput curve of the Bench Spectrograph Camera at about 3800 Å. The Simmons Camera should be used for observations that extend blueward of about 3800 Å.