2025PASP..137f5002M

We present the process and results of the Exo-Dragonfly project, an undertaking to adapt and use the Dragonfly Telephoto Array to observe exoplanet transit light curves. At the time of the project, the Dragonfly instrument, located in New Mexico, USA, was composed of 48 commercial 143 mm aperture telephoto lenses, split across two mounts and simultaneously observing the same field with r and g filters. The setup had a photon collection area equivalent to a 1 m diameter lens. With the driving goal of producing observations in support of the Transiting Exoplanet Survey Satellite follow-up efforts, we developed an automatic observation scheduling process, a new observing mode for time-sensitive time series observation, and a reduction/analysis pipeline to process data. Our results show that the Dragonfly Telephoto Array can achieve a photometric precision floor of ∼0.5 ppt for targets in the magnitude range of 8.5 ≲ m_V ≲ 13 for 4-5 minutes bins. We discuss the successes and challenges encountered while using this unique multi-camera telescope as well as suggestions for improvements of this (or other similar) instruments as they pertain to exoplanet transit observations moving forward.