We present photometry for three Koronis family asteroids, with new synodic rotation periods for two objects with no previously published dense lightcurves. The lightcurve for (1497) Tampere is consistent with the previously published period. We performed imaging observations of (2470) Agematsu on two telescopes and four nights in April 2023. Relative magnitudes for a given night were shifted to produce a self-consistent composite. The composite lightcurve results in an estimated period of 2.7952 ± 0.0007 h. We observed (3856) Lutskij remotely on three nights in early 2022 using two telescopes. The lightcurve is doubly-periodic at a period of 7.992 ± 0.002 h. The amplitude, 0.42 ± 0.03 mag, is sufficiently large that we may exclude the possibility of a singly-periodic lightcurve at one half that period, or a quadruply-periodic lightcurve at double the given period. Recently, a sparse-survey period has been given by Ďurech and Hanuš (2023) using GAIA DR3 photometry. Their result, 7.9934 h, with unspecified error, is consistent with ours.
This research made use of the Union College Observatory, and remote observations were made possible by the Union College Faculty Research Fund.