Sony SLT camera - Misplaced Pages

(Redirected from Single Lens Translucent)

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.

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. 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, 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 sensor.

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) and in the Pentax EI2000/Hewlett Packard 912 digital SLR of 2000 which used an optical viewfinder and on-sensor contrast-detection focussing.

List of SLT cameras

Model	Announcement	Megapixels	Sensor	Screen	Built-in flash
Sony Alpha 33	2010	14 MP	APS-C	3" articulated	(pop-up)
Sony Alpha 35	2011	16 MP	APS-C	3" fixed	(pop-up)
Sony Alpha 37	2012	16 MP	APS-C	2.7" tilting	(pop-up)
Sony Alpha 55	2010	16 MP	APS-C	3" articulated	(pop-up)
Sony Alpha 57	2012	16 MP	APS-C	3" articulated	(pop-up)
Sony Alpha 58	2013	20 MP	APS-C	2.7" tilting	(pop-up)
Sony Alpha 65	2011	24 MP	APS-C	3" articulated	(pop-up)
Sony Alpha 68	2015	24 MP	APS-C	2.7" tilting	(pop-up)
Sony Alpha 77	2011	24 MP	APS-C	3" fully articulated	(pop-up)
Sony Alpha 77 II	2014	24 MP	APS-C	3" fully articulated	(pop-up)
Sony Alpha 99	2012	24 MP	Full-frame sensor	3" fully articulated
Sony Alpha 99 II	2016	42 MP	Full-frame sensor	3" fully articulated

All of the above cameras record 1920x1080 video at 60i/30p (NTSC regions) or 50i/25p (PAL regions), in MPEG-4, AVCHD or H.264 formats. The Alpha 65 and 77 also records video at 50p or 60p, and the Alpha 99II records 4k video at 100 Mbit/s (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

Level	Sensor	2004		2005		2006		2007		2008		2009				2010			2011		2012				2013		2014		2015	2016		2017	2018	2019	2020

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)
Level	Sensor
		2004		2005		2006		2007		2008		2009				2010			2011		2012				2013		2014		2015	2016		2017	2018	2019	2020

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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Category Outline

Category:

Sony A-mount SLT cameras

List of SLT cameras

See also

References