EF 400mm f/2.8L IS III USM
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- 全球最輕400mm f/2.8鏡頭1
- 採用全新設計光學系統及應用碳纖維強化鎂合金的鏡身，大幅減低重量至只有2,840克，比上一代減輕超過25% (1,010克)
- 全新研發13組17片光學設計，加入2片螢石鏡片及1片超級UD鏡片，有效消除色散以提高解像度及反差
- 全新緊致型影像穩定器提供達5級快門防震2，提供IS模式1/2/3
- 加入「ASC空氣球體塗膜」（Air Sphere Coating）減少逆光拍攝時由反光引致的眩光及鬼影，從而於提升畫面清晰度及對比度
- 首次提供兩個預設對焦設定，可快速轉換對焦至兩個不同的預設位置
- 採用電子對焦環以及新增「手動對焦速度開關」提供3個手動對焦速度選擇
- 電動對焦 (Power Focus)為短片拍攝提供順暢的對焦效果
- 9片圓型光圈葉提供更漂亮柔和散景
- 最近對焦距離縮短至2.5米及提供0.17x最大放大率
- 在大幅減重的同時保持與上一代同樣高規格的耐用性及抗震性以滿足專業用家的需求
- 特設全新高反射性抗熱塗層，有效反射陽光中的紅外線，減低炎熱天氣時的鏡頭升温幅度，令長時間使用更舒適
- 全新雙層外鏡筒及內鏡筒設計及優化的鏡筒連接點結構，有效抑制導熱效果，大大減少高温環境下熱力從外部傳至鏡筒內
- 鏡頭的最前端及最後端鏡面均加入氟塗膜以減少微塵、油份及水份依附於鏡面及可輕易以乾布清潔
- 防塵防水滴設計以應付嚴峻拍攝環境3
- 隨附全新設計鏡頭蓋E-180E、鏡頭遮光罩ET-155(WIII)、插入式旋入式濾鏡架52 (WIII) 連52mm保護濾鏡及鏡頭軟袋LS400
- 用家亦可選購全新鏡頭短遮光罩ET-155B或鏡頭箱400E
1 與所有兼容單鏡反光相機及無反光鏡相機的400mm焦距f/2.8鏡頭作比較。截至2018年9月5日，根據佳能的調查。
2 CIPA 標準；焦距：400mm；使用EOS-1D X Mark II。
3 需配合EOS-1D系列機身，但不建議於雨中使用。
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