Unverified50% confidenceFactTime unknown

M4/3的2倍等效焦距系数让长焦端极具优势：100-400mm镜头等效200-800mm，加上机身轻便，打鸟/野生动物/体育摄影综合便携性和成本远优于全画幅

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UnverifiedAPS-C画幅机身搭配全画幅长焦有等效焦距加成（1.5-1.6倍），400mm镜头等效600mm，打鸟反而更划算；但全副长焦装在半幅机上体积重量不缩小79% similar UnverifiedAPS-C画幅在等效焦距上有约1.5倍（佳能1.6倍）裁切系数，打鸟/生态摄影用200mm镜头即可获得全幅300mm视角，反而比全幅更省钱省重量78% similar

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