Unverified78% confidenceCautionTime unknown
不建议APS-C画幅新手直接上全画幅70-200 f/2.8，等效变成105-300mm偏窄且负重大；APS-C用户拍运动用55-210或50-140/70-300更均衡
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78%
Confidence
Long-term
Relevance
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UnverifiedAPS-C画幅机身不建议买全画幅超广角标称焦距，14mm在APS-C上等效约21mm、视角收窄且难触发500法则优势，APS-C应选原生10-12mm超广镜头79% similarUnverifiedAPS-C画幅机身应选等效焦段合适的镜头(如16-50/17-70)，套用全画幅24-70等效约36-105mm会损失广角端，风光和室内不够广79% similarUnverifiedAPS-C画幅机身不必强行上全画幅超长焦定焦，其等效焦距已放大1.5-1.6倍，选专为APS-C设计的轻量长焦更平衡；反之全画幅镜头装APS-C会浪费成像圈和重量78% similarUnverifiedAPS-C画幅相机选定焦需按1.5倍(佳能1.6倍)换算等效焦距：即23mm约等于全画幅35mm、35mm约等于全画幅50mm，直接买35mm挂在APS-C上会偏长75% similarUnverifiedAPS-C画幅计算等效焦距需乘约1.5倍（佳能1.6倍），M4/3画幅乘2倍，选广角镜头时要注意小画幅上广角端会变窄，如16mm在M4/3等效32mm不再是广角74% similar
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