A product fill system and method uses a mode valve. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a 1-1st lens group G1-1 comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G1-2 comprising one positive lens and a second lens group G2 having positive refracting power. The windshield, which is a partially perforated tubular chamber, provides a protected zone against high velocity air infusion for the entire pilot light assembly. The valve can include check valves that are adjusted by rotatable cams for controlling the flow of fluids into and out of the ports. Clients are assigned to television tuners, and the clients display television programs received at the assigned tuner.