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本帖最后由 棱丝 于 2018-9-6 09:49 编辑
Phase Coatings
An optical tech used on roof prism bino to add color fidelity.
Due to roof design, the light entering an image erecting prism is split into two. The two halves travel through the prism independently and are rejoined before entering the eyepiece. Because the two light paths are slightly different lengths, one half of the light takes a little longer to travel through the prism than the other. When the two halves of the image are rejoined, the longer light path half is slightly out of phase with the light that took the shorter route. This can reinforce some light colors and cancel out others, affecting the color balance & fidelity.
Phase coatings are optical ones that are applied to one surface of the shorter light path half of the prism. The coating slightly slows down the short light path half of the incoming light that passes through that surface, causing it to once again be in phase with the light that traveled the longer path when they halves are rejoined.
With phase-corrected prisms, no colors are reinforced or cancelled, giving a more accurate color reproduction. The effect is particularly visible when looking sunward at a back-lit or silhouetted bird, where more color and detail can clearly be seen in the shadowed areas of the bird，the detail is invisible through a non-phase-coating binoc.
注：背光的物体色彩暗淡，反差很小，此时非相位膜的镜子很难发现细节。
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IP卡
狗仔卡
提升卡
置顶卡
沉默卡
喧嚣卡
显身卡
