Particle Photon - Semi Automatic and Manual Mode In this control mode the pilot fully controls the drone, commanding directly the control surfaces through the joystick, which permits to directly manage the servos movement. For a given exposure, this is an underdetermined systemas there are three inputs but only one output. Accordingly, there are many combinations that result in the same exposure — for example, decreasing the aperture by one stop but increasing the exposure time or sensitivity to compensate,[…]