Unverified90% confidenceDecision RuleTime unknown
恒定f/2.8的24-70mm是通用生产力焦段，24mm广角够拍环境和风景，70mm端可拍半身人像，一镜适合旅拍、活动、扫街三合一场景
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Unverified等效焦距决定旅行适用场景：24-28mm广角适合风光/街拍/建筑，35-50mm适合人文/人像；固定镜头机型（如GR为28mm、GRIIIx为40mm）需按主要拍摄题材选焦段，无法后期扩展80% similarUnverified全画幅24-70mm f/2.8约750-900g，24-105mm f/4约650-700g，长期手持拍摄或旅行时f/4版本轻150-250g，是通勤/扫街的更优解80% similarUnverified旅行一镜走天下优先选24-105mm或24-120mm f/4变焦，覆盖广角到中长焦，重量控制在700g以内，避免频繁换镜头错过瞬间且减少进灰风险77% similarUnverified70-200mm f/2.8属于恒定大光圈'大三元'定位，室内运动、婚礼、舞台、人像抓拍必备；若只在户外白天用，70-300mm f/4-5.6可减重一半并省下大量预算77% similarUnverified人像拍摄优先85mm f/1.4或f/1.8，透视压缩自然、背景虚化足够；50mm适合环境人像和通用记录；35mm适合环境叙事、纪实和室内空间受限场景76% similar
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