Comparison of the Sony SLT-A77 and the Sigma SD1
Sony SLT-A77
67 points
Sigma SD1
42 points
Sony SLT-A77
104 mm
143 mm
BODY
Sigma SD1
114 mm
146 mm
2011
YEARYear of announcement
2010
Magnesium alloy
BODY MATERIAL
Magnesium alloy
Weather
sealed
sealed
WEATHER SEALING
Weathersealed
Sony A
LENS MOUNT
Sigma SA
150 000 cycles
SHUTTER LIFEThe shutter durability as rated by the manufacturer.
100 000 cycles
732 g
1.61 lb
1.61 lb
143 x 104 x 81 mm
5.6 x 4.1 x 3.2 in.
5.6 x 4.1 x 3.2 in.
DIMENSIONS
& WEIGHTLength x Height x Width and the Weight incl. batteries and memory card
& WEIGHTLength x Height x Width and the Weight incl. batteries and memory card
DIMENS.
& WEIGHTLength x Height x Width and the Weight incl. batteries and memory card
& WEIGHTLength x Height x Width and the Weight incl. batteries and memory card
146 x 114 x 80 mm
5.7 x 4.5 x 3.1 in.
5.7 x 4.5 x 3.1 in.
807 g
1.78 lb
1.78 lb
Sony SLT-A77
Sigma SD1
24.3 MP
Sony IMX096 Exmor CMOS APS-C Sensor
SENSOR The number of effective megapixels (MP). Sensor manufacturer (if known) and sensor type.
SENSOR Sensor manufacturer (if known) and sensor type.
15.4 MP
Foveon F20A X3 CMOS APS-C Sensor
24.3 MP
EFFECTIVE MEGAPIX The number of effective megapixels (MP).
15.4 MP
23.5 x 15.6 mm
SENSOR SIZE
23.5 x 15.7 mm
6000 x 4000 pixels
MAX. RESOLUTIONMaximum still image resolution
MAX. RESOLUT.Maximum still image resolution
4704 x 3136 pixels
1.5x
CROP FACTORA 50mm lens on a camera with a crop factor of 1.5x would behave like a 75mm lens on a full-frame camera with a crop factor of 1x (50mm x 1.5 = 75mm)
1.5x
Bayer array
COLOR FILTER
Full Color
3.91 μm
PIXEL PITCHThe center-to-center distance between two pixels (photosites) on a sensor. The larger the photosites, the more light they can capture and the lower is the level of visible "noise" in captured images.
5 μm
Fixed
LOW-PASS FILTERA low-pass filter blurs fine details of an image to eliminate the moiré and the color artifacts of finely patterned structures. Without a low-pass filter images will appear sharper, but there is also a risk of moiré occurring in certain scenes.
None
3:2
NATIVE
ASPECT RATIOThe width to height ratio of the "straight out of the camera" images. However, most modern digital cameras are capable of producing images in various aspect ratios.
ASPECT RATIOThe width to height ratio of the "straight out of the camera" images. However, most modern digital cameras are capable of producing images in various aspect ratios.
ASPECT RATIOThe width to height ratio of the "straight out of the camera" images. However, most modern digital cameras are capable of producing images in various aspect ratios.
3:2
78
OVERALL SCOREDXOMARK Sensor Overall Score shows a camera's sensor quality in terms of noise, ability to render high contrast, formation of colored noise, ability to shoot in low light.
Not tested
13.2
DYNAMIC RANGEThe maximum dynamic range performance (DXOMARK Landscape Score) in exposure value (EV)
Not tested
801
LOW-LIGHT ISOThe low-light sensitivity performance (DXOMARK Sports Score) in ISO sensitivity value
Not tested
Sony SLT-A77
Sigma SD1
COVERAGE:
100 %
100 %
REAL SIZE:
0.71
0.71
VIEWFINDERThe viewfinder frame COVERAGE in percent and the real viewfinder SIZE (VF magnification corrected by the crop factor of a camera — this way cameras with different sensor sizes can be compared).
COVERAGE:
98 %
98 %
REAL SIZE:
0.63
0.63
Electronic (2 359 296 dot OLED)
VF TYPE
Optical (pentaprism)
Articulated
921 600 dot LCD
921 600 dot LCD
REAR SCREEN
Fixed
460 800 dot LCD
460 800 dot LCD
3 inch
SCREEN SIZE
3 inch
LIVE VIEW & TOUCH SCREEN
TOP LCD PANELLCD panel on top of the camera which provides information about the current camera settings.
No top LCD panel
Sony SLT-A77
Sigma SD1
Phase detection
AUTOFOCUS SYSTEM
AF SYSTEM
Phase detection
19
19
FOCUS POINTSAutofocus points
as shown in the figures below:
° linear sensors
° cross-type sensors
° dual cross-type sensors
contrast autofocus areas
as shown in the figures below:
° linear sensors
° cross-type sensors
° dual cross-type sensors
contrast autofocus areas
11
11
11
CROSS-TYPE FOCUS POINTS
CROSS-TYPE FP
11
-1
EV
100
The minimum exposure value of the AF working range (at 23°C and ISO 100). The smaller this value, the less light is needed for normal autofocus operation.-1
16 %
AF COVERAGEFrame coverage by AF sensors in percent.
12 %
Yes
IN-BODY
AF MOTORAn in-body AF motor gives the ability to auto-focus with older lenses which don't have their own motors.
AF MOTORAn in-body AF motor gives the ability to auto-focus with older lenses which don't have their own motors.
None
Sensor shift
IN-BODY IMAGE STABILIZATION
IMAGE STABILIZ.
No
Sony SLT-A77
Sigma SD1
BIONZ CXD4132
IMAGE
PROCESSOR
PROCESSOR
Dual TRUE II
12 bit RAW, MPO, JPEG
OUTPUT FORMATS
12 bit RAW, JPEG
Auto, 50 - 16000
ISO SENSITIVITY
100 - 6400
12
fps
fps
CONTINUOUS DRIVEMaximum frames per second (fps) in continuous drive mode when using the mechanical shutter.
CONT. DRIVEMaximum frames per second (fps) in continuous drive mode when using the mechanical shutter.
5
fps
fps
13 JPEG shots
13 RAW shots
13 RAW shots
MAX. BURSTMaximum number of shots in high-speed continuous drive mode until the buffer is full.
7 JPEG shots
7 RAW shots
7 RAW shots
1080p @ 60 fps (Full HD)
MAX. VIDEO RESOLUTION
VIDEO
No Video Mode
-5/+5 EV (in 1/3 or 1/2 EV steps)
EXPOSURE COMPENSATION
EXPOSURE COMPENS.
-3/+3 EV (in 1/3 EV steps)
Bulb,
30 sec → 1/8000 sec
30 sec → 1/8000 sec
SHUTTER SPEED Maximum and minimum possible exposure time in seconds.
Bulb,
30 sec → 1/8000 sec
30 sec → 1/8000 sec
Sony SLT-A77
Sigma SD1
X-SYNC:
1/250
GUIDE
NUMBER:
NUMBER:
GN:
12
BUILT-IN FLASH
GUIDE
NUMBER:
NUMBER:
GN:
11
X-SYNC:
1/180
Yes
HOT SHOE
Yes
USB 2.0 (480 Mbit/sec)
USB
USB 2.0 (480 Mbit/sec)
Microphone port, HDMI
CONNECTIONS
CONNECT.
Video out
BUILT-IN
DEVICES
DEVICES
SD, SDHC, SDXC, Memory Stick Pro Duo, Pro-HG Duo
STORAGE TYPES
Compact Flash (Type I, UDMA compatible)
1
CARD SLOTS
1
470
shots
shots
BATTERY LIFEMaximum number of images that can be shot per single battery charge (according to CIPA).
350
shots
shots
