是日本來想到大潭拍夜色下的大壩，也想先下午開始就在大潭附近看看有甚麼好東西拍。但是乘車到大潭的時候，那兒在下雨，剛巧身上又沒有帶備雨傘，於是便到赤柱去先了。甫下車，發覺天上好像有點有趣的東西，趕快跑到岸邊，啊，原來是雙彩虹！這是我的第一次拍到彩虹呢！

This is my first time to take photos of rainbow, and even double rainbows! Originally I would just stay at Tai Tam and wait to take night shots of the dam. But suddenly rain came, I did not get off the bus and went to Stanley. Surprisingly, something appeared in the sky…wow!

Secondary rainbows are caused by a double reflection of sunlight inside the raindrops, and appear at an angle of 50–53°. As a result of the second reflection, the colours of a secondary rainbow are inverted compared to the primary bow, with blue on the outside and red on the inside. The secondary rainbow is fainter than the primary because more light escapes from two reflections compared to one and because the rainbow itself is spread over a greater area of the sky. The dark area of unlit sky lying between the primary and secondary bows is called Alexander’s band.