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Sony SLT camera

From Wikipedia, the free encyclopedia

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.
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] although the SLT design avoids having pixels unavailable for image formation due to their space on the sensor being occupied by a dedicated phase detection autofocus sensel.

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

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Transcription

List of SLT cameras

Sony Alpha 55
Sony Alpha 55
Model Announcement Megapixels Sensor Screen Built-in flash
Sony Alpha 33 2010 14 MP APS-C 3" articulated Yes (pop-up)
Sony Alpha 35 2011 16 MP APS-C 3" fixed Yes (pop-up)
Sony Alpha 37 2012 16 MP APS-C 2.7" tilting Yes (pop-up)
Sony Alpha 55 2010 16 MP APS-C 3" articulated Yes (pop-up)
Sony Alpha 57 2012 16 MP APS-C 3" articulated Yes (pop-up)
Sony Alpha 58 2013 20 MP APS-C 2.7" tilting Yes (pop-up)
Sony Alpha 65 2011 24 MP APS-C 3" articulated Yes (pop-up)
Sony Alpha 68 2015 24 MP APS-C 2.7" tilting Yes (pop-up)
Sony Alpha 77 2011 24 MP APS-C 3" fully articulated Yes (pop-up)
Sony Alpha 77 II 2014 24 MP APS-C 3" fully articulated Yes (pop-up)
Sony Alpha 99 2012 24 MP Full-frame sensor 3" fully articulated No
Sony Alpha 99 II 2016 42 MP Full-frame sensor 3" fully articulated No

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.
This page was last edited on 15 January 2021, at 07:36
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