  We present a method for searching for polar candidates using mid-band
filters. One of the spectral singularities of polars is the $HeII
\lambda4686$\AA~ strong emission line. We selected the Edmund Optics filters
with central wavelengths of 470, 540, and 656 nm and a transmission bandwidth
of 10 nm. These filters cover the regions of the $HeII \lambda4686$\AA~ line,
continuum, and the $H_\alpha$ line respectively. We constructed a color diagram
based on the available spectra of polars and objects with a zero redshift from
the SDSS archive. We show that most polars make a group with unique color
indices. In practice, the method is implemented in SAO RAS at the Zeiss-1000
telescope with a new multi-mode photometer-polarimeter (MMPP). Approbation of
the method with the known polars allowed us to develop two criteria to select
candidates with an efficiency of up to 75\%.
