Those databacks are not full frame. They are more like the APS-

来源: 于 2011-12-09 05:11:28 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Those databacks are not full frame.  They are more like the APS-C cameras in the 135 format, with sensors covering about 50% of the medium format image circle.  Some have even smaller sensors.