Sony SLT camera

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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 an 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 and video recording operation.^[2] The fast continuous AF can be seen in live view mode.^[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

Sony Alpha 99, full-frame SLT camera

Model	Megapixels	Sensor	Screen	Built-in flash
Sony Alpha 33	14mp	APS-C	3" fully articulated	(pop-up)
Sony Alpha 35	16mp	APS-C	3" fixed	(pop-up)
Sony Alpha 37	16mp	APS-C	2.6" tilting (lower res)	(pop-up)
Sony Alpha 55	16mp	APS-C	3" fully articulated	(pop-up)
Sony Alpha 57	16mp	APS-C	3" fully articulated	(pop-up)
Sony Alpha 58	20mp	APS-C	2.7" fully articulated (lower res)	(pop-up)
Sony Alpha 65	24mp	APS-C	3" fully articulated	(pop-up)
Sony Alpha 77	24mp	APS-C	3" fully articulated	(pop-up)
Sony Alpha 99	24mp	Full-frame sensor	3" fully articulated (xtra fine)

All of the above cameras record 1920x1080 video at 60i/30p, in MPEG-4, AVCHD or H.264 formats.

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

References

↑ "Lenses for Translucent Mirror cameras". Sony.com.
↑ "Sony Single-Lens Translucent Cameras". KolariVision.com.
↑ "Mirrorless Cameras: A Primer". December 15, 2011.
↑ "Fujifilm's phase detection system explained". Digital Photography Review.
↑ Mike Tomkins. "Nikon V1, J1: Two new compact system cameras for Nikon's mirrorless debut". Imaging Resource.

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Sony SLT camera

List of SLT cameras

See also

References