The symbiotics RT Ser, DT Ser, and V2416 Sgr were observed as follows: SERRT 20000625.255 14.7V OCN SERRT 20000725.187 14.6V OCN SERDT 20000624.255 12.85V OCN SGRV2416 20000617.240 14.6V OCN **Note regarding indentification of DT Ser: According to B.Skiff, DT Ser = GSC 5096-1722= IRAS 17592-0126. This is the star I have observed. However, I have noted in the abstract for a paper that appeared in A+AS Vol.124, 7/1997, pgs.57-60 that the author(s) describe DT Ser as MagV= 15.4 and "5 arc-seconds from a V= 12.8, G-type companion". How is this discrepancy explained ? regards, Steve O'Connor.