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 [s:16]
http://www.canonrumors.com/2011/ ... -is-patent-pending/
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。
Patent Publication No. 2011-180218[li]2011.9.15 Release Date[/li][li]Filing date 2010.2.26[/li]
Example 1[li]Focal length f = 72.20 – 135.00 – 290.00mm[/li][li]Fno = 4.20 – 4.67 – 5.86[/li][li]Half angle of 16.68 – 9.10 – 4.27 °[/li][li]Image height 21.64mm[/li][li]Lens length 185.20 – 214.53 – 239.20mm[/li][li]Back Focus 46.74 – 47.82 – 57.41mm[/li][li]4.02x zoom ratio[/li][li]Group 6 for each group[/li][li]Positive and negative polarity positive or negative group configuration[/li]
Example 2[li]Focal length f = 102.20 – 200.00 – 390.01mm[/li][li]Fno = 4.10 – 4.55 – 5.90[/li][li]Half angle of 11.95 – 6.17 – 3.18 °[/li][li]Image height 21.64mm[/li][li]Lens length 228.18 – 258.83 – 288.12mm[/li][li]Back Focus 51.23 – 54.42 – 69.84mm[/li][li]3.82x zoom ratio[/li][li]Group 6 for each group[/li][li]Positive and negative polarity positive or negative group configuration[/li]
Example 3[li]Focal length f = 100.20 – 135.10 – 290.19mm[/li][li]Fno = 4.36 – 4.47 – 5.81[/li][li]Half angle of 12.18 – 9.10 – 4.26 °[/li][li]Image height 21.64mm[/li][li]Lens length 184.66 – 198.82 – 244.82mm[/li][li]Back Focus 42.53 – 46.68 – 63.07mm[/li][li]2.90x zoom ratio[/li][li]5 groups, each group[/li][li]Positive and negative group of negative polarity configuration[/li][li]Positive-lead type zoom lens[/li][li]High zoom ratio can be easily realized[/li][li]Rear Focus[/li][li]Can be miniaturized[/li][li]Easy full-time manual[/li][li]Suppressing the fluctuation of spherical aberration[/li][li]Upon zooming, if you move from behind the eyes, counting the two groups, the greater the variation of spherical aberration in the focusing[/li][li]On-axis beam angle θ the following equation:[/li][li]θ = AISN (1 / 2 * Fno)[/li][li]Spherical aberration is proportional to the fourth power of the high on-axis ray[/li][li]In focusing heavily on the object side to move first, counting from one group behind, which varies significantly higher on-axis ray[/li][li]Canon’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[/li]
[li]2011年9月15日發行日期[/li][li]申請日期2010年2月26日[/li]
示例1[li]焦距f = 72.20 - 135.00 - 290.00毫米[/li][li]FNO = 4.20 - 4.67 - 5.86[/li][li]半數 16.68角 - 9.10 - 4.27 °[/li][li]圖片高度21.64毫米[/li][li]鏡頭長度 185.20 - 214.53 - 239.20毫米[/li][li]後焦46.74 - 47.82 - 57.41毫米[/li][li]4.02x變焦比[/li][li]第6組每組[/li][li]正負極性正或負組的配置[/li]
例2[li]焦距F = 102.20 - 200.00 - 390.01毫米[/li][li]FNO = 4.10 - 4.55 - 5.90[/li][li]半數 11.95角 - 6.17 - 3.18 °[/li][li]圖片高度21.64毫米[/li][li]鏡頭長度 228.18 - 258.83 - 288.12毫米[/li][li]後焦51.23 - 54.42 - 69.84毫米[/li][li]3.82x變焦比[/li][li]第6組每組[/li][li]正負極性正或負組的配置[/li]
範例 3[li]焦距F = 100.20 - 135.10 - 290.19毫米[/li][li]FNO = 4.36 - 4.47 - 5.81[/li][li]半數 12.18角 - 9.10 - 4.26 °[/li][li]圖片高度21.64毫米[/li][li]鏡頭長度 184.66 - 198.82 - 244.82毫米[/li][li]後焦42.53 - 46.68 - 63.07毫米[/li][li]2.90x變焦比[/li][li]5組，每組[/li][li]陽性和陰性組的負極配置[/li][li]正導型變焦鏡頭[/li][li]高縮放比率可以輕鬆實現[/li][li]後部對焦[/li][li]可以小型化[/li][li]易全時手動[/li][li]抑制球面像差波動[/li][li]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[/li][li]在軸的光束角θ公式如下：[/li][li]θ= AISN（1 / 2 * FNO）[/li][li]球面像差是成正比的高點軸射線第四權力[/li][li]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[/li][li]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[/li]
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發表於 2011-9-21 00:03
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