R Leonis in maximum, i.e. how to hunt three ducks in one shot.

From a half of March 2012 I observe R Leo using DSLR photometry technique. The Mira-type variable reached brightness maximum of about 6,1 magnitudo in April and now is fading. Lucky within 3 degrees of R Leo I found two more variables of similar brightness: 1. DV Leo - a variable of SR type, which changes the brightness from about 7,8 to 8,2 magnitudo, 2. DY Leo - a variable of RS CVn type with variability of about 0,05 magnitudo (7,59-7,64). The variables easily fit within FOV of my setup (Cannon 400D+lens 85mm). For intermediate reduction spreadsheet I have taken 13 comparison stars with brightness between 5,1 and 8,2 magnitudo, color index B-V between -0,04 and 1,63. Comparison stars surround the variable stars. 18 Leo is a check star. I have attached the light curves from the AAVSO database. My observations of R Leo fit quite well with observations of the other AAVSO observers. I am particularly pleased with observations of DV Leo. There is only a few observations of DV Leo in the AAVSO database. But yet DY Leo is on the limit of accurancy of my observations. This way I hunted "3 ducks" (R Leo, DV Leo, DY Leo) in one shot ...