Problem No. 14 「Radiant lantern」
When taking a picture of a glowing lantern at night, a number of rays emanating from the centre of the lantern may appear in the pictures.
Explain and investigate this phenomenon.
14.提燈的輻射
在晚上給一個點燃的提燈拍照，會有大量從提燈中心發出的光線顯示在照片上。試解釋並探究這一現象。
....
是不是感覺自己為了做出實驗效果
已經花費了洪荒之力，
不要緊讓小編暴擊你一下吧！
原來已經有人做成了產品！！！
Star filters are a special effect filter that can turn a light source and image highlights into star shapes where light streaks out from a central light source. The brighter and larger your light source is, the more pronounced the effect will be, plus the spacing between the lines on the filter (something we'll look at in more detail shortly) will also have an effect on what type of star is produced.
星芒濾光片（星光鏡）是一種特殊的效果濾光片，它可以把光源和高亮度的圖像變為恆星形狀，其中光線從中央光源發出。你的光源越亮越大，效果就越明顯。同時濾光片上的線間距（我們將更詳細地看一下），也會對產生什麼類型的恆星產生影響。
***Give Me Four***
STAR-4 adds a dramatic four-cross flare to very bright areas, giving a soft-focus effect. Ideal for photographs of ladies wearing jewelry or other objects with strong reflections.
***Give Me Six***
STAR-6 adds a dramatic 6-point flare to very bright areas, giving a soft-focus effect. Ideal for photographs of ladies wearing jewelry or other objects with strong reflections.
***Give Me Eight***
STAR-8 adds a dramatic 8-point flare to very bright areas, giving a soft-focus effect. Ideal for photographs of ladies wearing jewelry or other objects with strong reflections.
Stars can have a various number of points; for example, Cokin's star filters create two-, four- and eight-point stars while Hoya's create four-, six- and eight-pointed light flares. How many points the stars have is determined by the number of directions the lines on the filters run in. These lines, which are etched onto the filters, are what create the star shapes and the more space there is between the lines, the fewer number of stars will appear in your image.
正如上面圖片所展示的，星芒濾光片可以有不同數量的線數；例如，Cokin公司的星芒濾光片就有兩線，四線和八線式，霍亞公司的產品就包括四、六、八線式。恆星有多少個點取決於星芒濾光片上線的方向數。這些刻在濾鏡上的線條決定了「星星」的形狀，線條之間的空間越大，你的圖像中出現的星星就越少。
法國 高堅 cokin 星光鏡系列
最後來一組買家秀吧！
（注意重點了嗎）