Payload activation device

A deployable payload for an aircraft, the deployable payload comprising:

• a payload activation device comprising:
• a camera having a fixed focal length, the camera being arranged to capture an image of an object on a platform for carrying a payload having the payload activation device, wherein, when the payload is in a first position relative to the platform, the image of the object is in a first focused state and, when the payload is in a second position relative to the platform, the image of the object is in a second focused state;
• and
• a processor configured to determine whether the image of the object is in the first focused state or the second focused state and to cause actuation of an activation mechanism within the payload, when the image of object is in the second focused state, to activate the payload,
• the deployable payload comprising an activation mechanism for activating the payload,
• wherein the activation mechanism is arranged to be actuated to activate the payload when the image of the object is in the second focused state.