small box your eye needs to be in to be at the right focal lenght I assume. makes for a very unforgiving scope and slows things down
vx1 3-9s were pretty simple to use with my eyes, the 4-12 on the other hand were awful
you put your eye behind it and you either got all black or a small tube of light in the middle surrounded by black
till your head hits the right spot then its normal
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