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

Model	Megapixels	Sensor	Screen	Built-in flash
Sony Alpha 33	14 MP	APS-C	3" articulated	(pop-up)
Sony Alpha 35	16 MP	APS-C	3" fixed	(pop-up)
Sony Alpha 37	16 MP	APS-C	2.7" tilting	(pop-up)
Sony Alpha 55	16 MP	APS-C	3" articulated	(pop-up)
Sony Alpha 57	16 MP	APS-C	3" articulated	(pop-up)
Sony Alpha 58	20 MP	APS-C	2.7" tilting	(pop-up)
Sony Alpha 65	24 MP	APS-C	3" articulated	(pop-up)
Sony Alpha 68	24 MP	APS-C	2.7" tilting	(pop-up)
Sony Alpha 77	24 MP	APS-C	3" fully articulated	(pop-up)
Sony Alpha 77 II	24 MP	APS-C	3" fully articulated	(pop-up)
Sony Alpha 99	24 MP	Full-frame sensor	3" fully articulated
Sony Alpha 99II	42 MP	Full-frame sensor	3" 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 100Mbps (using XAVC S) with full sensor read-out.

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.

Minolta/Konica Minolta/Sony DSLR and SLT A-mount timeline

	Sensor	2004		2005				2006				2007				2008				2009				2010				2011				2012				2013				2014				2015				2016
		3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4
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)

Single-lens translucent (SLT) camera
5-axis in-body image stabilization (bold)
HD video capable (Video AF)
Dual phase-detection AF (italic)

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Sony SLT camera

List of SLT cameras

See also

References