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The pathfinder Dragonfly Spectral Line Mapper is a distributed aperturetelescope based off of the Dragonfly Telephoto Array with additionalinstrumentation (the Dragonfly "Filter-Tilter") to enable ultranarrow bandpassimaging. The pathfinder is composed of three redundant optical tube assemblies(OTAs) which are mounted together to form a single field of view imagingtelescope (where the effective aperture diameter increases as the square-rootof the number of OTAs). The pathfinder has been on sky from March 2020 toOctober 2021 equipped with narrowband filters to provide proof-of-conceptimaging, surface brightness limit measurements, on sky testing, and observingsoftware development. Here we describe the pathfinder telescope and thesensitivity limits reached along with observing methods. We outline the currentlimiting factors for reaching ultra-low surface brightnesses and present acomprehensive comparison of instrument sensitivities to low surface brightnessline emission and other methods of observing the ultra-faint line emission fromdiffuse gas. Finally, we touch on plans for the upcoming 120-OTA DragonflySpectral Line Mapper, which is currently under construction.

The pathfinder Dragonfly Spectral Line Mapper: Pushing the limits for ultra-low surface brightness spectroscopy