Historical optical photometric observations from AAVSO, ASAS-SN, and DASCH of symbiotic systems: (a) BD Cam, (b) V1261 Ori, (c) NQ Gem, and (d) CD −27 8661. The AAVSO-UBVRI data are on the Vega system and ASAS-SN-V and DASCH-gmag data are on the AB system. The red and green lines indicate when the X-ray and TESS observations, respectively, were made. Our search does not provide optical measurements during the times that BD Cam and CD −27 8661 were observed in X-rays and with TESS; we therefore assume that all observations analyzed here were taken during normal brightness states of the sources.