Hi All, Just wanted to know if anybody here knew exactly how the Sensor Limit feature worked on Qflashes by Quantum. I know it's supposed to limit the distance/range the sensor eye on the flash can "see", thereby preventing the flash from trying to light a far away background, which would otherwise overexpose the subject in the foreground. What I want to know is the technical explanation of exactly how the flash manages to put this limit on the sensor's viewing/working distance. Besides just being curious about the technical operation of this feature, I also want to know about this for another reason that I'll try to articulate below: This is how Quantum defines the Sensor Limit feature somewhere on their Website: "Many flash units, when in automatic or TTL mode, will cause severe overexposure when the subject matter is far from the center of the frame, and the background is very far from the main subject. The unique sensor limit setting of the Quantum Qflash will prevent overexposure when the photographer dials in the approximate flash-to-subject distance, effectively telling the flash to disregard the distant background." I can understand why this is the case, since the sensor, with its narrow angle of view (Usually something like 30 Degrees), is looking at the background and not the subject that's away from the center of the image area being captured. What I don't understand is how limited the sensor's viewing distance tells it to measure light from the off-center subject instead. It's not really looking at the subject anyway. And if the subject and background are both within the viewing angle of the sensor, then how does limiting the distance make it ignore the background? I'm sure it does, but I just want to know how that's achieved. Also, the example image that Quantum provides at http://www.graphics.qtm.com/content/3233/329/600/329_1002.jpg does not really have the subject off-centered. The subject (The couple) is right at the center, yet it gets blown out by overexposure due to not using Sensor Limit, while using the feature exposes the subject correctly. Perhaps someone could use this example and describe exactly what is happening with the sensor eye in each case? That would be much appreciated. Thank You.