Canon EF 100-400 f/4-5.6L IS 新專利申請 ( 更新 )
不清楚是否第二代 , 畢竟推出差不多十三年 ( 1998 上市 ) , 但近來新鏡加價20-30% (比上一代) ( N家加更凶) , 實在吃不消http://www.canonrumors.com/2011/09/canon-ef-100-400-f4-5-6l-is-patent-pending/
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New 100-400 f/4-5.6L IS Optical Design
New 100-400 f/4-5.6L IS in the pipeline?A pending patent has shown up showing a new 100-400 optical design. This new design seems to suggest better optical performance as well as starting at f/4.
新100-400 f/4-5.6L 一個懸而未決的專利顯示了100-400呈現出新的光學設計。這種新的設計似乎暗示在f / 4更好的光學性能。
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Patent Publication No. 2011-1802182011.9.15 Release DateFiling date 2010.2.26
Example 1Focal length f = 72.20 – 135.00 – 290.00mmFno = 4.20 – 4.67 – 5.86Half angle of 16.68 – 9.10 – 4.27 °Image height 21.64mmLens length 185.20 – 214.53 – 239.20mmBack Focus 46.74 – 47.82 – 57.41mm4.02x zoom ratioGroup 6 for each groupPositive and negative polarity positive or negative group configuration
Example 2Focal length f = 102.20 – 200.00 – 390.01mmFno = 4.10 – 4.55 – 5.90Half angle of 11.95 – 6.17 – 3.18 °Image height 21.64mmLens length 228.18 – 258.83 – 288.12mmBack Focus 51.23 – 54.42 – 69.84mm3.82x zoom ratioGroup 6 for each groupPositive and negative polarity positive or negative group configuration
Example 3Focal length f = 100.20 – 135.10 – 290.19mmFno = 4.36 – 4.47 – 5.81Half angle of 12.18 – 9.10 – 4.26 °Image height 21.64mmLens length 184.66 – 198.82 – 244.82mmBack Focus 42.53 – 46.68 – 63.07mm2.90x zoom ratio5 groups, each groupPositive and negative group of negative polarity configurationPositive-lead type zoom lensHigh zoom ratio can be easily realizedRear FocusCan be miniaturizedEasy full-time manualSuppressing the fluctuation of spherical aberrationUpon zooming, if you move from behind the eyes, counting the two groups, the greater the variation of spherical aberration in the focusingOn-axis beam angle θ the following equation:θ = AISN (1 / 2 * Fno)Spherical aberration is proportional to the fourth power of the high on-axis rayIn focusing heavily on the object side to move first, counting from one group behind, which varies significantly higher on-axis rayCanon’s patents, and by fixing the first two groups, counting from the back of the eye movement to limit the amount counted from the first team back, suppressing the fluctuation of spherical aberration
專利公開號 2011-1802182011年9月15日發行日期申請日期2010年2月26日
示例1焦距f = 72.20 - 135.00 - 290.00毫米FNO = 4.20 - 4.67 - 5.86半數 16.68角 - 9.10 - 4.27 °圖片高度21.64毫米鏡頭長度 185.20 - 214.53 - 239.20毫米後焦46.74 - 47.82 - 57.41毫米4.02x變焦比第6組每組正負極性正或負組的配置
例2焦距F = 102.20 - 200.00 - 390.01毫米FNO = 4.10 - 4.55 - 5.90半數 11.95角 - 6.17 - 3.18 °圖片高度21.64毫米鏡頭長度 228.18 - 258.83 - 288.12毫米後焦51.23 - 54.42 - 69.84毫米3.82x變焦比第6組每組正負極性正或負組的配置
範例 3焦距F = 100.20 - 135.10 - 290.19毫米FNO = 4.36 - 4.47 - 5.81半數 12.18角 - 9.10 - 4.26 °圖片高度21.64毫米鏡頭長度 184.66 - 198.82 - 244.82毫米後焦42.53 - 46.68 - 63.07毫米2.90x變焦比5組，每組陽性和陰性組的負極配置正導型變焦鏡頭高縮放比率可以輕鬆實現後部對焦可以小型化易全時手動抑制球面像差波動經放大，如果你從後面的眼睛移動，計算兩組，更大的變化，在重點的球面像差在軸的光束角θ公式如下：θ= AISN（1 / 2 * FNO）球面像差是成正比的高點軸射線第四權力在重點對象上的第一面大量移動，從一個組後，這變化顯著更高的軸射線計數佳能的專利，並通過固定的前兩組，從眼動回數限制從一線隊後面的計算量，抑制了球面像差波動
感謝分享 多謝分享 感謝分享~~ 這隻白鏡也是我會想買的一隻雖然我有小小白IS 但是有些時候就是不夠遠
最主要是這隻的鏡片群組有螢石鏡片(小小白 / 小白兔也有)不是每隻白鏡都有的小白就沒有
玩C家 沒有玩玩白鏡 真的是很可惜 我的第一隻 L 就是 小小白IS 大白終於要出二代了 謝謝^ ^
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