相机不知道哪个动作该拍虚，哪张脸才重要，也不知道那扇亮窗该不该保持亮。先搞清楚测光系统替你做不了的那几个决定，然后按证据去诊断照片，而不是把每个转盘都拧一遍。
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光圈、快门速度和感光度都能让记录下来的画面变亮或变暗，但它们干的活不一样。光圈改变景深，快门速度改变运动模糊，感光度改变放大倍数和噪点的可见程度。先定下画面上不能让步的那个约束，再去平衡曝光。背「最佳参数」养成的是坏习惯，因为被摄对象和光线一直在变。
Need frozen motion? Set shutter first
Need several depths sharp? Set aperture first
Static scene, tripod? Keep ISO low; let shutter run long
Handheld still subject? Set minimum safe shutter; raise ISO if needed
One stop more light:
f/4 → f/2.8 1/250 s → 1/125 s ISO 400 → ISO 800
One stop less is the reverse.相机的拍摄模式其实是决策模式。景深重要、光线又在变时，光圈优先很好用。运动是主要约束时，快门优先更合适。光线稳定，或者测光系统一直在变主意时，手动曝光最省事。手动挡本身并不更有艺术性。
f 值越小，开口越大，进光越多，景深通常越浅。f 值越大，进光越少，前后能维持可接受清晰度的范围通常越大。拍摄距离同样关键：贴近被摄物，景深就薄得可怜；退后几步，它又变厚了。画幅大小和焦距也在影响观感，所以「f8 拍什么都清楚」不是定律。
Portrait starting point: f/2.8 to f/4, focus on near eye
Two staggered people: f/5.6, place focus near the front person
Landscape on tripod: f/8, verify near and far detail
Close-up object: stop down and expect very thin depth
# Inspect at 100%, not only on the rear screen
Too little depth → close aperture, step back, or align subjects
Soft everywhere at f/22 → diffraction may be the cost给新手的建议我说得直白：不要每张人像都用镜头的最大光圈。可能睫毛是实的，虹膜已经糊了；拍合影更是变成抽奖。只有当浅景深真的服务于这张照片，而且你的对焦精度撑得住时，才开大光圈。
快门打开的这段时间里，被摄对象的移动和相机的抖动都会被记下来。快门快，能凝住更多动作，但收到的光更少。快门慢，进光更多，动作变成模糊。防抖能压住你的手抖，但它凝不住一个跑动的小孩。分清这两件事，能少出一大批糊片。
Starting tests, not guarantees:
1/1000 s birds, fast field sport
1/500 s running people
1/250 s walking people, casual action
1/125 s still person who may shift
1/30 s deliberate blur or stabilized static scene
1 s+ tripod, trails, moving water
Handheld baseline: shutter ≈ 1 / full-frame-equivalent focal length
Then test your hands, camera, stabilization, and output size.要拍追随摇摄，就在曝光过程中以及结束之后都平稳地跟着对象转。拍车辆可以从 1/125 秒左右起步，连拍一小串，再调。成功率会很低，这是技术活的常态，不是失败。
测光系统靠反射光估算曝光。它倾向于把很亮的场景压暗、把很暗的场景提亮，因为它不知道被摄对象本该是什么明暗。曝光补偿就是告诉自动模式：偏离这个估算值。直方图显示的是分布，不是艺术上的对错。夜景可以整体偏左，雪景可以整体偏右。
Snow looks gray → try +1 EV, check highlight warning
Black stage looks gray → try -1 EV, protect lit faces
Backlit portrait dark → meter face, add compensation, or add light
Bright sign clipped → reduce exposure until important channels survive
ISO policy:
1. Pick aperture for depth.
2. Pick shutter for motion.
3. Use the ISO required to support both.
4. Check important highlights; refine.低感光度不是信仰。一张有噪点但清晰的照片，通常比一张干净的糊片有用。提高感光度不会造出光来，但拒绝提高它，可能逼你用一个直接毁掉照片的快门速度。活动现场变化太快、来不及一直手调时，就用自动感光度，并设一个合理的最低快门。
单次自动对焦合焦后就锁住，适合不动的对象。连续自动对焦在你按住对焦控制期间一直更新，适合动态。区域模式决定相机可以在哪里找。单点给你控制权，小区域能容忍瞄不太准。主体识别很好用，但它是助手，不是「合焦的确实是那只该实的眼睛」的证明。
Still portrait: single AF + eye or small point on near eye
Runner toward you: continuous AF + tracking/zone + burst
Bird behind branches: small point; avoid broad auto-area
Landscape: single AF; place focus deliberately; verify magnified
Low contrast wall: aim at a nearby edge with contrast, then recompose carefully
Focus check:
front detail sharp → focus landed in front
rear detail sharp → focus landed behind
nothing sharp → motion, shake, haze, or severe defocus半按锁定再重新构图，在近距离加大光圈时会让对焦平面偏掉。改成直接移动对焦点，谨慎使用眼部识别，或者把光圈收一点。取景器脏了想擦就擦，但要记住：光学取景器里看得见的灰，通常不会出现在文件里。
焦距短，视角宽；焦距长，视角窄。透视，也就是近处和远处物体的相对大小关系，只在相机位置改变时才变。镜头之所以老被怪罪，是因为摄影师拿广角就往前凑，拿长焦就往后退。相机站在原地不动，把画面裁到相同取景，透视是一模一样的。
Wide view: 16–24 mm full-frame equivalent
Everyday view: 28–50 mm equivalent
Narrow view: 85–200 mm equivalent
Portrait face looks stretched:
1. Do not merely zoom.
2. Step farther from the face.
3. Choose a longer focal length to restore framing.
Crop factor example:
23 mm on APS-C ≈ 35 mm full-frame field of view
Actual conversion depends on the camera's crop factor.先站到能给出你想要的透视的那个位置上，再用焦距去取景。拍室内退不开的时候，广角是务实的选择，但别让脸落在被拉伸的画面边角。拍人像，先按面部透视决定相机距离，再去追背景虚化。
光有方向、有相对大小、有强度、有颜色。大光源离对象近，阴影边缘就柔；小光源或远光源，边缘就硬。正面光把细节铺平，侧光交代质感和体积，逆光勾出轮廓但容易让脸变暗。在你打算再买一支镜头之前，先让人相对窗户挪两步，盯着这张脸的变化看。
Window portrait, practical setup:
1. Turn off mixed-color ceiling lights.
2. Place subject beside, not directly against, the window.
3. Rotate until one cheek has shape but both eyes retain light.
4. Move closer to the window for softer, stronger light.
5. Use a white wall or card opposite if shadows are too deep.
6. Expose for skin; check bright forehead and shirt highlights.一组照片需要色调一致时，别用自动白平衡。固定一个白平衡值，或者在同样的光下拍一张中性参考帧。RAW 的修正余量更大，但如果偏蓝的日光和偏橙的家用灯泡从两个方向同时打在同一块皮肤上，它也没法干净地调和。混合光能在拍摄时解决就在拍摄时解决。
三分法是辅助轮，不是判决书。更有力的问题是：你想让观者先看到什么，画面里又有什么在跟它抢注意力？亮斑、高饱和的颜色、人脸、文字、高反差边缘都在拉眼睛。先清理画面边缘、简化背景、选对时机，再去考虑把主体挪到某条想象出来的网格线上。
Ten-second edge scan before the shutter:
□ pole or branch growing from a head?
□ bright exit sign or white patch stealing attention?
□ fingers, feet, wheels, or building tops clipped awkwardly?
□ horizon visibly tilted?
□ subject looking or moving into cramped space?
□ duplicate objects touching at confusing tangents?
Then take one step left, right, lower, or closer.
Small camera moves can separate overlapping shapes.我最看重的构图原则是减法。如果多塞进一点景物画面并没有变好，那就靠近一点，或者换个位置。居中可以很有力量，对称可以做到精确，留白可以承载情绪。用某条有名字的规则，只在它帮到主体的时候，而不是拿来给一个糟糕的判断做装饰。
RAW 文件存的是几乎没处理过的传感器数据加上元数据。它在白平衡和影调调整上余量更大，但需要兼容的软件，还得导出成品。JPEG 在机内处理完成，体积小，能立刻分享，对大幅度修正的容忍度差。RAW 不会自动更锐，它也救不回过曝溢出的高光和跑焦。
Choose RAW when:
exposure or color may need careful adjustment
the job matters enough to edit and archive
high-contrast light needs maximum available latitude
Choose JPEG when:
files must leave the camera quickly
storage and transfer speed dominate
camera color is accepted and exposure is controlled
Choose RAW+JPEG when:
immediate delivery and later editing both matter
but verify cards, buffer speed, and backup capacity first原始文件要留着，但也要导出标准 JPEG 供日常查看。一个装满专有格式 RAW 的文件夹不算完成的归档。按日期建文件夹，保两份互相独立的拷贝，再把一份放到主设备之外。如果目录库只指向一块硬盘，那它不是备份。
.RAW 改名成 .JPG 并不会完成格式转换。别急着删掉废片，留着把它读完。用百分之百放大打开文件，看清哪里是实的，读一遍它的曝光参数，再和相邻的几张比较。把光圈、快门、感光度、对焦模式、防抖和镜头一次全换掉，等于把证据抹干净。
Failure Evidence First fix
moving subject smeared background remains sharp faster shutter
whole frame trails stationary edges streak brace/tripod/faster shutter
earside sharp, subject soft focus landed in front move AF point; refocus
eye sharp, ears too soft thin depth of field close aperture or step back
bright area has no detail histogram clipped right reduce exposure/add light control
shadows noisy after editing underexposed important area add light or expose more safely
colors shift frame to frame auto white balance varies fixed WB/reference frame
flare and washed contrast strong light hits lens shade lens/change angle
repeating spots at small f-stop same spots across frames inspect sensor; use proper cleaning
Keep with each test: file, settings, focal length, focus mode,
subject movement, camera support, and a sentence about intent.值得养成的习惯是按顺序做决定：先定画面里的运动、景深、对焦点和光线，然后让感光度去支撑这些选择。相机之所以复杂，是因为它给这四个决定提供了太多快捷方式。一旦你知道是哪个决定失手了，照片这件事反而简单了。