Why no DSLR with on-sensor PDAF and optical viewfinder?

Started Apr 3, 2014 | Discussions thread
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(unknown member) Contributing Member • Posts: 501
Why no DSLR with on-sensor PDAF and optical viewfinder?

Most DSLRs use a separate phase-detection autofocus (PDAF) sensor, which often needs offset calibration. Canon's 70D has PDAF on the image sensor, but only in Live View. Why not combine the best of both?

  • PDAF on image sensor
  • Semi-transparent main mirror
  • Optical viewfinder (OVF)


  • No separate PDAF sensor → no calibration, smaller camera
  • Same autofocus in OVF and Live View
  • PDAF with same power consumption (if PDAF part of image sensor can be powered individually from image array)
  • Combination of phase-detection and contrast-detection possible (though at higher power)
Canon EOS 70D
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