T​he SNYPRalignment device replaces and is used in the same manner as a rear peep sight is installed and used on a compound bow.  The video below was shot through the optical center of the SNYPRalignment device shown in the preceeding photographs.  The target seen in the video is positioned 20 yards in front of device.  The target is a standard 12 inch archery target with a 3 inch 10 ring (the white area in the center of the target) and a 1.5 inch X ring.  

The red four-part area seen in the video is the image of the light from a 0.040 inch red fiber optic pin as divided into four parts by the optical diffraction effects of the four apertures of the SNYPRalignment device (as shown in the prior photograph).  In aligning the shot of the arrow to the intended impact point on target,  the four parts of the red-light image become more symmetric as the precise  center point alignment of the line of sight approaches the exact center point of the tip of the front sight red fiber optic pin.  The black crosshair or plus sign image (between the four parts of the red light image) is formed as the red light passes though the center of the SNYPRalignment device.  The arms of the plus sign image are approximately 0.008 inch in width.  

These dimensions of the fiber optic pin (0.040 inch) and the width of the arms (0.008 inch) of the plus sign image, allow for the archer to align the line of sight to within 0.002 inch of the center of the flight path of the arrow.  No other archery device provides to the aiming eye of an archer a precise visual image indicating the actual alignment of the archer's line of sight with the flight path of the arrow to the aim point on target.  The limits on the precision of the alignment are only limited by the visual acuity of the archer.  The video following is to visually verify the above described function of the SNYPRalignment device as used on a properly tuned compound bow with a front sight fiber optic pin.