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SLT is the abbreviation for Sony's single lens translucent[1] camera concept. It's an alternate DSLR concept with a fixed semi-reflective mirror and an electronic viewfinder instead of optical pentaprism or pentamirror reflex finder. The translucent mirror directs parts of the light onto a set of phase-detecting autofocus sensors, only 70% of the light from the lens goes through the mirror onto the image sensor. The idea is in some ways a revival of the "pellicle" mirror of the Canon Pellix of 1965. The lens mount used on Sony's SLTs is the newest enhanced variant of Minolta AF mount which Sony had inherited from Konica Minolta in their 2006 SLR technology transfer deal. Thus even the oldest Minolta AF-lenses (or Maxxum-lenses) can be applied on the SLTs and even on the adapters which convert Sony NEXes to SLTs.

This concept enables on the one hand electronic viewfinders in system cameras for the the Sony α system, on the other hand easier implementation of autofocus by phase detection.


enhanceable to SLT

  • Sony NEX and other Sony E-mount CSCs, but only when combined with LA-EA2 or LA-EA4 Adapter with built-in pellicular phase-AF


  1. Sony's use of the word "translucent" to mean "semi-reflective" deviates from the way most English-speakers understand the word, and has come in for some criticism.