One Leaf NV100 12mm or 16mm? I want to order one of the One Leaf NV100 add on night vision units. Is it best to get the 12mm which has 1x to 6x magnification, or the 16mm version that has a 4x to 24x magnification range? It will most likely be on my FX Impact with an Athalon 4.5 to 30 x56...