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I held various colors out against various colored backgrounds which might be common colors for shirts, in various lighting conditions, to see what contrasted well with the various shirt colors a person might wear, when picking my sight colors. (Advantage Tactical sights come with all 5 color rear and ll5 color front inserts and you can choose what you see best, change them if you want different, I chose orange rear and yellow front sights) the reverse of this photo because I could "find" the front yellow sight the fastest.
I can "make" a triangle MUCH faster than I ever could line up dots.
http://www.advantagetactical.com/