A system and method of tracking an object is disclosed. Light is received from the object at a lens having an optical axis, a non-linear off-axis (peripheral) portion and an on-axis portion. The received light is directed onto a photodetector array via the non-linear peripheral portion of the lens. A direction of the object with respect to an optical axis of the lens is determined from a location of the light on the photodetector array. The determined direction is used to orient the optical axis of the lens toward object to track the object. The photodetector array and lens may be coupled to a projectile and the determined direction may be used to direct the projectile to hit a target.
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