[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"knowledge-\u002Fapi\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F05-aperture":3,"knowledge-related-\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F05-aperture":439,"knowledge-series-\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F05-aperture":466},{"source":4,"connector":5,"page":6},"sqlite","better-sqlite3",{"path":7,"title":8,"description":9,"category":10,"tags":11,"date":15,"pinned":16,"draft":16,"body":17,"seo":435,"stem":436,"id":437,"extension":438},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F05-aperture","光圈详解","光圈（Aperture）是镜头内由叶片组成的可调光阑。f 值越小，孔越大，进光越多，景深越浅。","生活笔记",[12,13,14],"photography","basics","aperture","2026-06-05",false,{"type":18,"value":19,"toc":420},"minimark",[20,23,32,37,44,48,51,118,124,127,138,149,153,172,182,185,196,199,202,216,226,230,243,246,316,320,343,346,384,387,390,398,401],[21,22,8],"h1",{"id":8},[24,25,26,27,31],"p",{},"光圈（Aperture）是镜头内由叶片组成的可调光阑。",[28,29,30],"strong",{},"f 值越小，孔越大","，进光越多，景深越浅。",[33,34,36],"h2",{"id":35},"f-值为什么数字小-孔大","f 值为什么「数字小 = 孔大」",[24,38,39,40,43],{},"f 值 = 焦距 ÷ 入射光瞳直径。例如 50mm 镜头，入射瞳直径 25mm → f\u002F2。所以 ",[28,41,42],{},"f\u002F1.4 比 f\u002F8「大光圈」","，别被数字大小误导。",[33,45,47],{"id":46},"景深光圈的第一影响","景深：光圈的第一影响",[24,49,50],{},"在同一对焦距离与焦距下：",[52,53,54,70],"table",{},[55,56,57],"thead",{},[58,59,60,64,67],"tr",{},[61,62,63],"th",{},"光圈",[61,65,66],{},"景深",[61,68,69],{},"典型画面",[71,72,73,85,96,107],"tbody",{},[58,74,75,79,82],{},[76,77,78],"td",{},"f\u002F1.4～f\u002F2",[76,80,81],{},"很浅",[76,83,84],{},"眼睛清晰、耳朵虚化的人像",[58,86,87,90,93],{},[76,88,89],{},"f\u002F4～f\u002F5.6",[76,91,92],{},"中等",[76,94,95],{},"半身人像，背景轻微虚化",[58,97,98,101,104],{},[76,99,100],{},"f\u002F8～f\u002F11",[76,102,103],{},"较深",[76,105,106],{},"小合影、环境人像",[58,108,109,112,115],{},[76,110,111],{},"f\u002F16～f\u002F22",[76,113,114],{},"很深",[76,116,117],{},"风光、建筑全清晰",[24,119,120,123],{},[28,121,122],{},"注意","：对焦在眼睛时，f\u002F1.4 可能导致鼻尖或耳朵虚；合影人数多时需收光圈。",[33,125,126],{"id":126},"进光与快门联动",[24,128,129,130,133,134,137],{},"光圈每收",[28,131,132],{},"一档","，进光减半，在 ISO 不变时需快门",[28,135,136],{},"慢一档","：",[139,140,145],"pre",{"className":141,"code":143,"language":144},[142],"language-text","f\u002F2.8  1\u002F500s  ISO 100\n  ↓ 收一档到 f\u002F4\nf\u002F4    1\u002F250s  ISO 100  （同等亮度）\n","text",[146,147,143],"code",{"__ignoreMap":148},"",[33,150,152],{"id":151},"最佳光圈画质","最佳光圈（画质）",[24,154,155,156,159,160,163,164,167,168,171],{},"多数镜头在 ",[28,157,158],{},"f\u002F4～f\u002F8"," 时中心与边缘锐度最佳；",[28,161,162],{},"最大光圈","边缘往往略软；",[28,165,166],{},"极小光圈","（f\u002F16 起，高像素机身 f\u002F11 即可察觉）会因",[28,169,170],{},"衍射","导致整体解析力下降——这是物理限制，与镜头贵贱无关。",[173,174,175,179],"ul",{},[176,177,178],"li",{},"人像：可接受 f\u002F1.8～f\u002F2.8 的轻微软，换虚化。",[176,180,181],{},"风光：常用 f\u002F8～f\u002F11 折中景深与锐度。",[33,183,184],{"id":184},"星芒与光圈叶片",[24,186,187,188,191,192,195],{},"强点光源（路灯、太阳）在 ",[28,189,190],{},"f\u002F11～f\u002F16"," 时易出现",[28,193,194],{},"星芒","；叶片数量影响星芒「芒数」。",[33,197,198],{"id":198},"虚化还取决于什么",[24,200,201],{},"即使 f\u002F1.8，以下情况虚化也有限：",[173,203,204,207,210],{},[176,205,206],{},"焦距很短（16mm 广角）",[176,208,209],{},"相机离主体很远（如远景环境人像）",[176,211,212,215],{},[28,213,214],{},"背景离主体很近","（背景与主体处于相近物距，都在景深范围内 → 虚化弱）",[24,217,218,221,222,225],{},[28,219,220],{},"人像虚化公式（经验）","：中长焦 + 大光圈 + ",[28,223,224],{},"主体与背景距离拉远"," + 相机离主体较近。",[33,227,229],{"id":228},"景深与物距补充","景深与物距（补充）",[24,231,232,233,236,237,242],{},"景深与",[28,234,235],{},"对焦距离","强相关：微距、特写时即使 f\u002F8 也只有毫米级清晰范围；风光对焦无穷远时，从某距离到∞都在可接受清晰范围内（见 ",[238,239,241],"a",{"href":240},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fscenarios\u002Fnature","超焦距","）。",[33,244,245],{"id":245},"不同题材起点光圈",[52,247,248,261],{},[55,249,250],{},[58,251,252,255,258],{},[61,253,254],{},"题材",[61,256,257],{},"建议起点",[61,259,260],{},"备注",[71,262,263,274,284,295,305],{},[58,264,265,268,271],{},[76,266,267],{},"单人肖像",[76,269,270],{},"f\u002F1.8～f\u002F2.8",[76,272,273],{},"对焦在靠近镜头的那只眼",[58,275,276,279,281],{},[76,277,278],{},"双人合影",[76,280,89],{},[76,282,283],{},"保证两人都在景深内",[58,285,286,289,292],{},[76,287,288],{},"街拍快照",[76,290,291],{},"f\u002F5.6～f\u002F8",[76,293,294],{},"景深容错大",[58,296,297,300,302],{},[76,298,299],{},"风光",[76,301,100],{},[76,303,304],{},"配三脚架时可更小",[58,306,307,310,313],{},[76,308,309],{},"微距",[76,311,312],{},"f\u002F8～f\u002F16",[76,314,315],{},"景深极浅，常需补光或堆栈",[33,317,319],{"id":318},"光圈优先模式a-av用法","光圈优先模式（A \u002F Av）用法",[321,322,323,330,333,336],"ol",{},[176,324,325,326,329],{},"转盘切到 ",[28,327,328],{},"A","。",[176,331,332],{},"拨轮设光圈（如 f\u002F2.8）。",[176,334,335],{},"相机自动匹配快门；注意取景器内快门是否过慢（\u003C 1\u002F60 手持风险）。",[176,337,338,339,342],{},"开启 ",[28,340,341],{},"Auto ISO"," 并设上限，暗光时自动提 ISO。",[33,344,345],{"id":345},"常见误区",[52,347,348,358],{},[55,349,350],{},[58,351,352,355],{},[61,353,354],{},"误区",[61,356,357],{},"正解",[71,359,360,368,376],{},[58,361,362,365],{},[76,363,364],{},"永远 f\u002F1.4 最专业",[76,366,367],{},"景深太浅易跑焦，且镜头未必最锐",[58,369,370,373],{},[76,371,372],{},"风光必须 f\u002F22",[76,374,375],{},"f\u002F16 以上衍射明显，优先 f\u002F8～f\u002F11 + 对焦技巧",[58,377,378,381],{},[76,379,380],{},"虚化只靠光圈",[76,382,383],{},"焦距与距离同样关键",[33,385,386],{"id":386},"练习",[24,388,389],{},"固定 50mm 定焦，同一模特或静物：",[321,391,392,395],{},[176,393,394],{},"f\u002F1.8、f\u002F4、f\u002F11 各拍一张，对比背景与锐度。",[176,396,397],{},"记录每次快门速度，验证互易律。",[33,399,400],{"id":400},"小结",[173,402,403,413],{},[176,404,405,406,409,410,412],{},"光圈控制",[28,407,408],{},"进光","与",[28,411,66],{},"，是人像与氛围的核心旋钮。",[176,414,415,416,419],{},"下一节：",[28,417,418],{},"快门","——决定运动是凝固还是流动。",{"title":148,"searchDepth":421,"depth":421,"links":422},2,[423,424,425,426,427,428,429,430,431,432,433,434],{"id":35,"depth":421,"text":36},{"id":46,"depth":421,"text":47},{"id":126,"depth":421,"text":126},{"id":151,"depth":421,"text":152},{"id":184,"depth":421,"text":184},{"id":198,"depth":421,"text":198},{"id":228,"depth":421,"text":229},{"id":245,"depth":421,"text":245},{"id":318,"depth":421,"text":319},{"id":345,"depth":421,"text":345},{"id":386,"depth":421,"text":386},{"id":400,"depth":421,"text":400},{"title":8,"description":9},"knowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F05-aperture","knowledge\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F05-aperture.md","md",{"items":440},[441,446,450,454,458,462],{"path":442,"title":443,"description":444,"category":10,"score":445},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F02-camera-parts","相机结构与按键","拿到相机后，先熟悉机身各部位名称与必改的设置项，避免拍摄时手忙脚乱。",9,{"path":447,"title":448,"description":449,"category":10,"score":445},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F10-focus-modes","对焦模式与对焦点","对焦决定画面中哪一段距离最清晰。选错对焦模式是新手糊片的首要原因之一。",{"path":451,"title":452,"description":453,"category":10,"score":445},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F03-lens-basics","镜头基础","镜头是相机的「眼睛」。同一机身换不同镜头，视角、虚化、最近对焦距离都会改变。本节讲清初学者最需要的镜头知识。",{"path":455,"title":456,"description":457,"category":10,"score":445},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F08-exposure-metering","测光与曝光补偿","相机通过测光系统判断场景亮度，并给出推荐曝光。理解测光模式与曝光补偿，能减少「脸太黑、雪太白」的翻车。",{"path":459,"title":460,"description":461,"category":10,"score":445},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F01-camera-types","认识相机：类型与选择","摄影的第一步不是买最贵的机身，而是搞清楚你手里的设备属于哪一类、适合拍什么。本节梳理常见相机形态，帮你建立整体认知。",{"path":463,"title":464,"description":465,"category":10,"score":445},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F07-iso","ISO 感光度详解","ISO（感光度）表示传感器对光的敏感程度。数值越高，在同样光圈与快门下画面越亮，但噪点与动态范围损失通常越明显。",{"series":467,"title":13,"items":468,"index":501,"prev":502,"next":503},"life-notes\u002Fphoto-creation\u002Fbasics",[469,471,473,475,479,480,484,486,488,492,494,497],{"path":459,"title":460,"date":470,"pinned":16},"2025-06-18",{"path":442,"title":443,"date":472,"pinned":16},"2026-07-21",{"path":451,"title":452,"date":474,"pinned":16},"2026-03-06",{"path":476,"title":477,"date":478,"pinned":16},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F04-exposure-triangle","曝光三要素总览","2024-11-13",{"path":7,"title":8,"date":15,"pinned":16},{"path":481,"title":482,"date":483,"pinned":16},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F06-shutter-speed","快门速度详解","2024-12-26",{"path":463,"title":464,"date":485,"pinned":16},"2025-04-06",{"path":455,"title":456,"date":487,"pinned":16},"2025-07-20",{"path":489,"title":490,"date":491,"pinned":16},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F09-white-balance","白平衡与色温","2025-03-19",{"path":447,"title":448,"date":493,"pinned":16},"2026-03-27",{"path":495,"title":496,"date":491,"pinned":16},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F11-file-formats","RAW 与 JPEG",{"path":498,"title":499,"date":500,"pinned":16},"\u002Fknowledge\u002Flife-notes\u002Fphoto-creation\u002Fbasics\u002F12-composition-basics","构图基础","2025-03-10",4,{"path":476,"title":477,"date":478,"pinned":16},{"path":481,"title":482,"date":483,"pinned":16}]