Centering cone for shooting glasses (for 37 mm diameter lenses).

How to adjust the lens placement with this centering cone:

1. (Assume your normal shooting position)

2. Place the centering cone in front of the lens and move it slowly, at an angle, until the image seen through it is a perfect circle. When this happens, the lens is correctly aligned with the shooter's eye, which is what we want for optimal vision. Once the adjustment is made, the cone is removed from the glasses. 

(To use this centering cone on EUROPEAN PRECISION glasses, you must use the same mount you use to mount color filters. For all other brands, it is used directly.)

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