What is the maximum distance that Pixy can detect objects?

Pixy can detect an object that is miles away as long as the object is large enough. Described another way -- Pixy will detect an object that's as small as 4x1 pixels in the image. This means it can detect a ping-pong ball sized object at 10 feet, assuming a 75 degree field-of-view lens (the lens Pixy ships with). A lens with a longer focal length can greatly extend the detection distance, but with a narrower field of view.