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The results of modeling the dependence of the red leak of photometric filterson various factors (color index V-R, luminosity class, interstellar reddening,airmass and PWV) during observations of stars are presented. The error arisingfrom not taking into account the red leak in the case of filters used on the0.6-m telescope of the CMO SAI can amount to 0.6-0.8 mag for late stars.Algorithms for reducing observational data are presented for filters U and B.The results of observations of the rapid variability of two symbiotic stars CHCyg and SU Lyn with cold components of very late spectral types are presented.For CH Cyg, rapid variability was detected on both observation dates. Takinginto account the red leak effect, the amplitude in the B band was 0.10 mag onNovember 6, 2019 and 0.19 mag on December 15, 2022, with a characteristicvariability time of about 20 minutes. For SU Lyn, no rapid brightnessvariability was detected in the B band on February 2, 2023 (with an accuracy of0.003 mag).

On the Influence of ''Red Leak''of Light Filters on the Brightness  Estimates of Stars of Late Spectral Types Illustrated by the Observations of  Rapid Variability of Symbiotic Stars