On the Kodak Regent focusing is done by turning the Focus Knob on the front of the drop down Baseboard. The knob's shaft is geared to the Focus Rack which moves the lens standard backward and forward. The Focus Rack is also attached to the Focus Arm in the bellows compartment. As the Focus Arm slides, it engages Cam A which turns on a shaft connected to one of the rangefinder mirrors which rotates.