Based on space-variant polarization manipulation and polarizing interference,a set of amplitude pupil filters is presented. The control of axial focal shift and extended focal depth can be realized when keeping the transverse superresolution. This filter consists of two parallel polarizers,an electro-optical crystal and a two-zone half-wave plate. The electro-optical tuning characteristic and modulated distribution of intensity in the focal region of the filtered optical system are analyzed. When the modulated phase delay varies from –π to π,the real-time control of the focal shift and transverse superresolution behavior can be obtained. Here this system can be realized as a lens having variable focus with transverse superresolution adjusted by external voltage. The ratio of the first zero position can be modulated by azimuth angle of the inner λ/2 plate when the electro-optical phase delay is chosen. The electro-optical phase delay to change the focal depth can be realized in real-time control when the azimuth angle of the inner λ/2 plate is chosen.