Sony SLT camera

The Sony SLT design features a pellicle mirror which allows light to strike both the digital image sensor (parallel to the lens mount, behind mirror) and phase-detection autofocus sensor (perpendicular to the mount) at all times.

Single-Lens Translucent (SLT) is a Sony proprietary designation for Sony Alpha cameras which employ a pellicle mirror, electronic viewfinder, and phase-detection autofocus system. They employ the same Minolta A-mount as Sony Alpha DSLR cameras.[1]

Sony SLT cameras have a semi-transparent fixed mirror which diverts a portion of incoming light to a phase-detection autofocus sensor, while the remaining light strikes a digital image sensor. The image sensor feeds the electronic viewfinder, and also records still images and video on command. The utility of the SLT design is to allow full-time phase-detection autofocus during electronic viewfinder, live view, and video recording operation.[2][3] With the advent of digital image sensors with integrated phase-detection, the SLT design is no longer required to accomplish this goal, as evidenced by cameras such as the Sony NEX-5R, Fujifilm X-100s, and Nikon 1.[4][5]

The term "translucent" is a misnomer for the actual SLT design, which employs a pellicle mirror that is not translucent. Pellicle mirrors have been used in single-lens reflex cameras from at least the 1960s (see Canon Pellix).

List of SLT cameras

Sony Alpha 55
ModelMegapixelsSensorScreenBuilt-in flash
Sony Alpha 3314 MPAPS-C3" articulated (pop-up)
Sony Alpha 3516 MPAPS-C3" fixed (pop-up)
Sony Alpha 3716 MPAPS-C2.7" tilting (pop-up)
Sony Alpha 5516 MPAPS-C3" articulated (pop-up)
Sony Alpha 5716 MPAPS-C3" articulated (pop-up)
Sony Alpha 5820 MPAPS-C2.7" tilting (pop-up)
Sony Alpha 6524 MPAPS-C3" articulated (pop-up)
Sony Alpha 6824 MPAPS-C2.7" tilting (pop-up)
Sony Alpha 7724 MPAPS-C3" fully articulated (pop-up)
Sony Alpha 77 II24 MPAPS-C3" fully articulated (pop-up)
Sony Alpha 9924 MPFull-frame sensor3" fully articulated
Sony Alpha 99II42 MPFull-frame sensor3" fully articulated

All of the above cameras record 1920x1080 video at 60i/30p, in MPEG-4, AVCHD or H.264 formats. The Alpha 99II also records 4k video at 100Mbit/s (using XAVC S) with full sensor read-out.

Source: summarised from the full comparison table at DP Review.

See also

References

  1. ↑ "Lenses for Translucent Mirror cameras". Sony.com.
  2. ↑ "Sony Single-Lens Translucent Cameras". KolariVision.com.
  3. ↑ "Mirrorless Cameras: A Primer". December 15, 2011.
  4. ↑ "Fujifilm's phase detection system explained". Digital Photography Review.
  5. ↑ Mike Tomkins. "Nikon V1, J1: Two new compact system cameras for Nikon's mirrorless debut". Imaging Resource.
Sensor 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
34 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
Professional Full frame α900 α99 α99 II
α850
High-end APS-C DG-7D α700 α77 α77 II
Midrange α65 α68
Upper-entry α55 α57
α100 α550 α580 α58
DG-5D α500 α560
α450
Entry-level α33 α35 α37
α350 α380 α390
α300 α330
α200 α230 α290
Early models Minolta 7000 with SB-70/SB-70S (1986) · Minolta 9000 with SB-90/SB-90S (1986) (Still video SLRs)
Minolta MS-C1100 (1992) · Minolta RD-175 (1995)
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