Sony Alpha a9 vs Sony Alpha a7R III

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Main
Model
Price
Advantages

launch
Announced
Body type
Camera subcategory
Sensor
Effective pixels
Max resolution
Sensor size
Sensor type
Processor
Image ratio w:h
Sensor photo detectors
Image
ISO
Boosted ISO (minimum)
Boosted ISO (maximum)
White balance presets
Custom white balance
Image stabilization
Image stabilization notes
Uncompressed format
JPEG quality levels
CIPA image stabilization rating
Photography features
Minimum shutter speed
Maximum shutter speed
Maximum shutter speed (electronic)
Aperture priority
Shutter priority
Manual exposure mode
Subject / scene modes
Built-in flash
External flash
Flash modes
Continuous drive
Self-timer
Metering modes
Exposure compensation
AE Bracketing
WB Bracketing
Screen / viewfinder
Articulated LCD
Screen size
Screen dots
Touch screen
Screen type
Live view
Viewfinder type
Viewfinder coverage
Viewfinder magnification
Viewfinder resolution
Videography features
File Format
Microphone
Speaker
Optics & Focus
Autofocus
Number of focus points
Lens mount
Focal length multiplier
Digital zoom
Manual focus
Physical
Weight (inc. batteries)
Dimensions
Environmentally sealed
Battery
Battery details
Battery Life (CIPA)
Storage
Storage types
Connectivity
USB
HDMI
Microphone port
Headphone port
Wireless
Wireless notes
Remote control
Other features
Orientation sensor
GPS
Timelapse recording
Samples
Videos

9.66/10

Main
Model
Sony Alpha a9
Price
Advantages
PHOTOGRAPHY FEATURES Continuous drive: 20.0 fps
OPTICS & FOCUS Number of focus points: 693
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Main
Model
Sony Alpha a7R III
Price
Advantages
SENSOR Effective pixels: 42 megapixels
SENSOR Max resolution: 7952 x 5304
SENSOR Sensor photo detectors: 44 megapixels
PHOTOGRAPHY FEATURES Subject / scene modes: Yes
PHYSICAL Weight (inc. batteries): 657 g (1.45 lb / 23.17 oz)
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launch
Announced
2017
Body type
Camera subcategory
SLR-style mirrorless
Sensor
Effective pixels
24 megapixels
Max resolution
6000 x 4000
Sensor size
Full frame (35.6 x 23.8 mm)
Sensor type
BSI-CMOS
Processor
BIONZ X
Image ratio w:h
3:2, 16:9
Sensor photo detectors
28 megapixels
Image
ISO
Auto, ISO 100-51200 (expands to 50-204800)
Boosted ISO (minimum)
50
Boosted ISO (maximum)
204800
White balance presets
10
Custom white balance
Yes
Image stabilization
Sensor-shift
Image stabilization notes
5-axis
Uncompressed format
RAW
JPEG quality levels
Extra fine, fine, standard
CIPA image stabilization rating
—
Photography features
Minimum shutter speed
30 sec
Maximum shutter speed
1/8000 sec
Maximum shutter speed (electronic)
1/32000 sec
Aperture priority
Yes
Shutter priority
Yes
Manual exposure mode
Yes
Subject / scene modes
No
Built-in flash
No
External flash
Yes (via hot shoe or flash sync port)
Flash modes
Flash off, Autoflash, Fill-flash, Slow Sync., Rear Sync., Red-eye reduction, Wireless, Hi-speed sync
Continuous drive
20.0 fps
Self-timer
Yes (2, 5, 10 secs + continuous)
Metering modes
- Multi
- Center-weighted
- Highlight-weighted
- Average
- Spot
Exposure compensation
±5 (at 1/3 EV, 1/2 EV steps)
AE Bracketing
±5 (3, 5 frames at 1/3 EV, 1/2 EV, 2/3 EV, 1 EV, 2 EV steps)
WB Bracketing
Yes (3 frames, H/L selectable)
Screen / viewfinder
Articulated LCD
Tilting
Screen size
3″
Screen dots
1,440,000
Touch screen
Yes
Screen type
TFT LCD
Live view
Yes
Viewfinder type
Electronic
Viewfinder coverage
100%
Viewfinder magnification
0.78×
Viewfinder resolution
3,686,400
Videography features
File Format
MPEG-4, AVCHD, H.264
Microphone
Stereo
Speaker
Mono
Optics & Focus
Autofocus
- Contrast Detect (sensor)
- Phase Detect
- Multi-area
- Center
- Selective single-point
- Tracking
- Single
- Continuous
- Touch
- Face Detection
- Live View
Number of focus points
693
Lens mount
Sony E
Focal length multiplier
1×
Digital zoom
—
Manual focus
—
Physical
Weight (inc. batteries)
673 g (1.48 lb / 23.74 oz)
Dimensions
127 x 96 x 63 mm (5 x 3.78 x 2.48″)
Environmentally sealed
Yes
Battery
Battery Pack
Battery details
NP-FZ100
Battery Life (CIPA)
650
Storage
Storage types
Dual SD/SDHC/SDXC slots (UHS-II compatible)
Connectivity
USB
USB 2.0 (480 Mbit/sec)
HDMI
Yes (micro-HDMI)
Microphone port
Yes
Headphone port
Yes
Wireless
Built-In
Wireless notes
802.11b/g/n + NFC + Bluetooth
Remote control
Yes (Wired or wireless)
Other features
Orientation sensor
Yes
GPS
None
Timelapse recording
—
————
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launch
Announced
2017
Body type
Camera subcategory
SLR-style mirrorless
Sensor
Effective pixels
42 megapixels
Max resolution
7952 x 5304
Sensor size
Full frame (35.9 x 24 mm)
Sensor type
BSI-CMOS
Processor
Bionz X
Image ratio w:h
3:2, 16:9
Sensor photo detectors
44 megapixels
Image
ISO
Auto, 100-32000 (expands to 50-102400)
Boosted ISO (minimum)
50
Boosted ISO (maximum)
102400
White balance presets
10
Custom white balance
Yes
Image stabilization
Sensor-shift
Image stabilization notes
5-axis
Uncompressed format
RAW
JPEG quality levels
Extra fine, fine, standard
CIPA image stabilization rating
5.5 stop(s)
Photography features
Minimum shutter speed
30 sec
Maximum shutter speed
1/8000 sec
Maximum shutter speed (electronic)
—
Aperture priority
Yes
Shutter priority
Yes
Manual exposure mode
Yes
Subject / scene modes
Yes
Built-in flash
No
External flash
Yes (via hot shoe or flash sync port)
Flash modes
Off, Auto, Fill-flash, Slow Sync, Rear Sync, Red-eye reduction, Wireless, Hi-speed sync
Continuous drive
10.0 fps
Self-timer
Yes (2 or 10 sec; continuous (3 or 5 exposures))
Metering modes
- Multi
- Center-weighted
- Spot
Exposure compensation
±5 (at 1/3 EV, 1/2 EV steps)
AE Bracketing
±5 (3, 5 frames at 1/3 EV, 1/2 EV, 2/3 EV, 1 EV, 2 EV steps)
WB Bracketing
Yes
Screen / viewfinder
Articulated LCD
Tilting
Screen size
3″
Screen dots
1,440,000
Touch screen
Yes
Screen type
TFT LCD
Live view
Yes
Viewfinder type
Electronic
Viewfinder coverage
100%
Viewfinder magnification
0.78×
Viewfinder resolution
3,686,400
Videography features
File Format
MPEG-4, AVCHD, XAVC S
Microphone
Stereo
Speaker
Mono
Optics & Focus
Autofocus
- Contrast Detect (sensor)
- Phase Detect
- Multi-area
- Center
- Selective single-point
- Tracking
- Single
- Continuous
- Touch
- Face Detection
- Live View
Number of focus points
425
Lens mount
Sony E
Focal length multiplier
1×
Digital zoom
Yes
Manual focus
Yes
Physical
Weight (inc. batteries)
657 g (1.45 lb / 23.17 oz)
Dimensions
127 x 96 x 74 mm (5 x 3.78 x 2.91″)
Environmentally sealed
Yes
Battery
Battery Pack
Battery details
NP-FZ100 lithium-ion battery and charger
Battery Life (CIPA)
650
Storage
Storage types
Two SD/SDHC/SDXC slots (UHS-II support on one)
Connectivity
USB
USB 3.1 Gen 1(5 GBit/sec)
HDMI
Yes (micro HDMI)
Microphone port
Yes
Headphone port
Yes
Wireless
Built-In
Wireless notes
802.11b/g/n + NFC + Bluetooth
Remote control
Yes (wired, wireless, smartphone)
Other features
Orientation sensor
Yes
GPS
None
Timelapse recording
Yes (via downloadable app)
————
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Summary

The Sony Alpha a7R III maximum resolution of 7952 x 5304 pixels (42 megapixels) is better than the Sony Alpha a9 maximum resolution of 6000 x 4000 pixels (24 megapixels). The Sony Alpha a9 offers more focus points in compare with the Sony Alpha a7R III: 693 vs 425. More number of focus points means less risk of losing focus lock during following a moving object.

The Alpha a7R III weighs 657g which is 16g less than the weight of the Alpha a9.

Considering the above-mentioned differences the Sony Alpha a7R III will be the best buy. Get the lowest price on Amazon.