when transparent complementary colors are superimposed they produce black thus when the eye of an operator is properly centered on the optical axis of the riflescope an apparent image of a single black indicator is perceived even the slightest deviation of the eye from the optical axis will produce a tinge of both bright red and bright green along the edges of the image such color changes are readily perceived by the peripherical vision of the operator without the operator having to take his or her eye off the target of interest another variation would be to fabricate primary indicator 44 of the same opaque material as crosshairs 42 and fabricate secondary indicator 46 of a bright transparent color such as red or green when properly aligned the bright red image of secondary indicator 46 will be totally covered by that of primary indicator 44 and an operator will see no color at all only the black appearing image of the primary indicator another variation of the present invention as described thus far is shown in fig7 9 with reference now to fig7 reticle 36 comprises opposing planar faces 38 and 40 as previously described reticle 36 may be fabricated from optically flat glass or the like as stated earlier a prototype of the present invention has a thickness of 0 100 u2033 thus in the prototype faces.