Recently I bought a pair of binoculars called Kronos EWA 6×30, with 6x magnification, 30mm aperture, 12 degree angular field of view and it is stated made in Russia.Based on my calculation, this Extra Wide Angle EWA 6×30 has 16x light gathering power of human eye. It means that bino would increase magnitude limit by 3 level.Suppose my limiting magnitude is up to 3 magnitude, this bino make me
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