Canon 16-35 f/2.8 DO Patent ??

netvictor

http://www.canonrumorsMore lens patents
This is an interesting DO patent from Canon. There seems to be a lot of them showing up, but no new DO products in a long while.
I’ve been told the lack of an A+ filterable wide angle from Canon for a full frame camera will be addressed sooner than later. Yes, there’s Zeiss, but most want AF.
Patent Publication No. 2011-145518

[li]Release Date 2011.7.28[/li][li]Filing date 2010.1.15[/li]

Example 1

[li]Focal length f = 16.48 – 24.00 – 33.95 mm[/li][li]Fno = 2.91[/li][li]Half angle of 52.70 – 42.04 – 32.51 °[/li][li]4 aspherical surfaces[/li][li]Zoom Ratio 2.06[/li][li]Four-group zoom lens plus a negative sign[/li][li]Second lens focusing is performed by Inner Focus[/li][li]Solve various problems using the diffractive optical element[/li][li]The astigmatism of the telephoto kept in order, to increase the refractive index of the positive lens[/li][li]A high refractive index, chromatic aberration occurs[/li][li]Aberration and astigmatism in the center of the telephoto image has a correlation, it is difficult to simultaneously correct[/li][li]Made achromatic diffractive optical element, a positive lens astigmatism correcting high refractive index[/li]

.com/2011/08/canon-16-35-f2-8-do-patent/






更多鏡頭的專利
，這是一個有趣的DO專利佳能。似乎有很多，其中顯示出來，但沒有新的DO產品在很長一段時間。

我已經告訴缺乏一個 A +過濾廣角佳能對全畫幅相機將更快得到解決比晚。是的，有蔡司，但最想AF。

專利公開號 2011-145518

發行日期2011年7月28日
申請日期2010年1月15日
示例1

焦距f = 16.48 - 24.00 - 33.95毫米
FNO = 2.91
半角的52.70 - 42.04 - 32.51 °
4片非球面表面
變焦比2.06
四組變焦鏡頭加上一個負號
二是通過鏡頭聚焦心靈專注
解決各種問題，​​利用衍射光學元件
散光的長焦保持秩序，提高折射率透鏡的正
高折射率，色差出現
像差及散光在中心的長焦形象具有相關​​性，這是很難同時正確
衍射光學元件製造無色，積極散光鏡片矯正高折射率

yaochen

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bv4bg

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turnroll

Canonrumor 網站來的東西,笑笑就好吧
看太認真會中暑喔[s:29]

yonger

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