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58问答库 > 残幅镜头适马17-50F2.8 DC OS装在残幅相机上最大光圈能开到2.8吗？

残幅镜头适马17-50F2.8 DC OS装在残幅相机上最大光圈能开到2.8吗？

2025-04-05 14:21:14

推荐回答（1个）

回答（1）：

首先，那个转换系数，应该叫“焦距转换系数”，只是物理焦距转换成等效焦距而已，光圈不会转换的……还是原始值。
其次，无论是全幅镜头还是半幅镜头，装到半幅机身上都有那个焦距转换系数的。
全幅镜头与半幅镜头的差别不是焦距，而是像场大小……全副头像场更广。

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