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numpad0
1y ago
Technically, many dSLRs use beam splitter principle and secondary mirrors to feed the image to AE/AF device at the bottom side of mirror box.
RobotToaster
1y ago
Sony also made some SLR that used beamsplitters
https://en.wikipedia.org/wiki/Sony_SLT_camera
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actionfromafar
1y ago
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Curiously, there was also a Canon SLR with a beam splitter.
https://en.wikipedia.org/wiki/Canon_Pellix