1. An apparatus comprising: (a) an archery bow including a riser, limbs, a bowstring, and a peep sight mounted on the bowstring; and (b) an archery sight including a mounting bracket, an annular sight ring, one or more sight pins, and a set of two or more nested, annular, substantially concentric, visually contrasting areas attached to a rearward surface of the sight ring and arranged substantially concentrically relative to the sight ring, wherein: (c) the annular sight ring has a central opening that extends axially through the ring; (d) the one or more sight pins are positioned within the central opening of the sight ring; (e) the mounting bracket is arranged to mount the sight ring on the archery bow with a central axis of the annular sight ring in a fore-and-aft orientation relative to the bow; (f) the bow is arranged so that, when held at full draw, the peep sight and the central axis of the sight ring are substantially aligned along an intended sight line for the bow; (g) the peep sight includes a peep aperture, and one or more of the sight pins are visible to an archer looking through the peep aperture and though a central opening of an innermost one of the annular contrasting areas; and (h) respective diameters of the peep aperture and the annular contrasting areas result, with an archer looking through the peep aperture along the intended sight line, in (i) an image observed by the archer of a substantially circular border of a first one of the annular contrasting areas substantially coinciding with an observed image of the peep aperture at a first ambient light level, and (ii) an image observed by the archer of a substantially circular border of a second one of the annular contrasting areas, differing from the first one, substantially coinciding with an observed image of the peep aperture at a second ambient light level differing from the first ambient light level.