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Sony A9 vs Sony RX100 IV

Portability
65
Imaging
74
Features
93
Overall
81
Sony Alpha A9 front
 
Sony Cyber-shot DSC-RX100 IV front
Portability
89
Imaging
52
Features
79
Overall
62

Sony A9 vs Sony RX100 IV Key Specs

Sony A9
(Full Review)
  • 24MP - Full frame Sensor
  • 3" Tilting Display
  • ISO 100 - 51200 (Raise to 204800)
  • Sensor based 5-axis Image Stabilization
  • 1/8000s Max Shutter
  • 3840 x 2160 video
  • Sony E Mount
  • 673g - 127 x 96 x 63mm
  • Launched April 2017
  • Replacement is Sony A9 II
Sony RX100 IV
(Full Review)
  • 20MP - 1" Sensor
  • 3" Tilting Screen
  • ISO 125 - 12800 (Bump to 25600)
  • Optical Image Stabilization
  • 3840 x 2160 video
  • 24-70mm (F1.8-2.8) lens
  • 298g - 102 x 58 x 41mm
  • Announced June 2015
  • Previous Model is Sony RX100 III
  • Successor is Sony RX100 V
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Sony A9 vs Sony RX100 IV Overview

Its time to look more closely at the Sony A9 vs Sony RX100 IV, former is a Pro Mirrorless while the latter is a Large Sensor Compact and both are created by Sony. The image resolution of the A9 (24MP) and the RX100 IV (20MP) is pretty close but the A9 (Full frame) and RX100 IV (1") enjoy different sensor size.

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The A9 was unveiled 23 months after the RX100 IV which makes the cameras a generation away from one another. Both the cameras offer different body type with the Sony A9 being a SLR-style mirrorless camera and the Sony RX100 IV being a Large Sensor Compact camera.

Before diving in to a more detailed comparison, below is a short summary of how the A9 grades versus the RX100 IV with regard to portability, imaging, features and an overall mark.

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Reasons to pick Sony A9 over the Sony RX100 IV

 A9 RX100 IV 
AnnouncedApril 2017June 2015Newer by 23 months
Screen resolution1440k1229kClearer screen (+211k dot)
Touch friendly screen Quickly navigate

Reasons to pick Sony RX100 IV over the Sony A9

 RX100 IV A9 
Selfie screen Easy selfies

Common features in the Sony A9 and Sony RX100 IV

 A9 RX100 IV 
Focus manually Very accurate focus
Screen typeTiltingTiltingTilting screen
Screen sizing3"3"Equivalent screen size

Sony A9 vs Sony RX100 IV Physical Comparison

When you are planning to travel with your camera, you should factor its weight and volume. The Sony A9 has got outer measurements of 127mm x 96mm x 63mm (5.0" x 3.8" x 2.5") having a weight of 673 grams (1.48 lbs) whilst the Sony RX100 IV has sizing of 102mm x 58mm x 41mm (4.0" x 2.3" x 1.6") along with a weight of 298 grams (0.66 lbs).

Compare the Sony A9 vs Sony RX100 IV in our completely new Camera & Lens Size Comparison Tool. Camera Size Comparison with Lenses

Keep in mind, the weight of an ILC will vary based on the lens you are using at the time. Below is the front view sizing comparison of the A9 vs the RX100 IV.

Sony A9 vs Sony RX100 IV size comparison

Using dimensions and weight, the portability rating of the A9 and RX100 IV is 65 and 89 respectively.

Sony A9 vs Sony RX100 IV top view buttons comparison

Sony A9 vs Sony RX100 IV Sensor Comparison

More often than not, its tough to imagine the gap in sensor dimensions simply by researching specs. The picture underneath will help give you a far better sense of the sensor sizing in the A9 and RX100 IV.

As you can plainly see, each of these cameras enjoy different megapixel count and different sensor dimensions. The A9 with its bigger sensor is going to make getting shallow DOF less difficult and the Sony A9 will provide you with extra detail having an extra 4MP. Higher resolution can also help you crop photographs far more aggressively. The more modern A9 should have an advantage in sensor tech.

Sony A9 vs Sony RX100 IV sensor size comparison

Sony A9 vs Sony RX100 IV Screen and ViewFinder

Sony A9 vs Sony RX100 IV Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Sony A9 Portrait photography features
Sony RX100 IV Portrait photography features
84
you can focus manually
good megapixels (24MP)
sensor size is large (Full frame)
comes with face detection autofocus
delivers RAW files
65
manual focus
above average flash sync speed (1/2,000 seconds)
megapixel count good (20 megapixels)
sensor size is nice (1")
features face detection focus
delivers RAW files
can't use external flash
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Street Comparison

Sony A9 as a Street photography camera
Sony RX100 IV as a Street photography camera
79
has a tilting screen
built in image stabilization (Sensor based 5-axis)
sensor size is large (Full frame)
delivers RAW files
provides touch focus
weather proofing
good ISO range (51,200)
85
tilting screen
image stabilization (Optical)
sensor size is nice (1")
delivers RAW files
lighter than competition (298 grams)
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Sports Comparison

Sony A9 as a Sports photography camera
Sony RX100 IV as a Sports photography camera
87
high shutter speed (1/8,000s)
quiet shooting (1/32,000s)
fast continuous shooting (20.0 frames/s)
built in image stabilization (Sensor based 5-axis)
good megapixels (24 megapixels)
sensor size is large (Full frame)
comes with tracking autofocus
weather proofing
better than average battery life (650 shots)
comes with phase detect autofocus
68
quiet mode (1/32,000 seconds)
fast shooting (16.0 frames per second)
image stabilization (Optical)
megapixel count good (20MP)
sensor size is nice (1")
features tracking autofocus
lack of phase detect auto focus
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Travel Comparison

Sony A9 Travel photography advice
Sony RX100 IV Travel photography advice
74
better than average battery life (650 per charge)
weather proofing
has bluetooth
provides touch focus
good megapixels (24MP)
display isn't selfie friendly
86
lighter than competition (298g)
megapixel count good (20MP)
built-in flash
selfie friendly screen
decently wide (24mm)
very good max aperture (f1.8)
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Landscape Comparison

Sony A9 Landscape photography factors
Sony RX100 IV Landscape photography factors
86
you can focus manually
switch lenses (Sony E mount)
nice screen size (3 inches)
built in image stabilization (Sensor based 5-axis)
good megapixels (24 megapixels)
sensor size is large (Full frame)
good ISO range (51,200)
delivers RAW files
weather proofing
better than average battery life (650 shots)
has dual storage slots
74
manual focus
decently wide (24mm)
very good max aperture (f1.8)
screen size is good (3 inches)
image stabilization (Optical)
megapixel count good (20MP)
sensor size is nice (1")
delivers RAW files
lens is fixed (fixed lens mount)
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Vlogging Comparison

Sony A9 Vlogging details
Sony RX100 IV Vlogging details
37
screen is touchscreen
built in image stabilization (Sensor based 5-axis)
comes with face detection autofocus
good video quality (3840 x 2160 pixels)
does have external microphone jack
display isn't selfie friendly
81
decently wide (24mm)
very good max aperture (f1.8)
selfie friendly screen
image stabilization (Optical)
features face detection focus
video res high (3840 x 2160 resolution)
lighter than competition (298 grams)
doesn't have external mic port
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Sony A9 vs Sony RX100 IV Specifications

Detailed spec comparison table for Sony A9 and Sony RX100 IV
 Sony Alpha A9Sony Cyber-shot DSC-RX100 IV
General Information
Brand Name Sony Sony
Model Sony Alpha A9 Sony Cyber-shot DSC-RX100 IV
Class Pro Mirrorless Large Sensor Compact
Launched 2017-04-19 2015-06-10
Body design SLR-style mirrorless Large Sensor Compact
Sensor Information
Powered by BIONZ X Bionz X
Sensor type BSI-CMOS BSI-CMOS
Sensor size Full frame 1"
Sensor dimensions 35.6 x 23.8mm 13.2 x 8.8mm
Sensor surface area 847.3mm² 116.2mm²
Sensor resolution 24 megapixels 20 megapixels
Anti aliasing filter
Aspect ratio 3:2 and 16:9 1:1, 4:3, 3:2 and 16:9
Peak resolution 6000 x 4000 5472 x 3648
Highest native ISO 51200 12800
Highest enhanced ISO 204800 25600
Minimum native ISO 100 125
RAW pictures
Minimum enhanced ISO 50 80
Autofocusing
Focus manually
Touch focus
Continuous AF
AF single
Tracking AF
AF selectice
AF center weighted
AF multi area
Live view AF
Face detect focusing
Contract detect focusing
Phase detect focusing
Number of focus points 693 25
Lens
Lens mounting type Sony E fixed lens
Lens focal range - 24-70mm (2.9x)
Maximum aperture - f/1.8-2.8
Macro focus distance - 5cm
Number of lenses 121 -
Crop factor 1 2.7
Screen
Display type Tilting Tilting
Display diagonal 3 inches 3 inches
Resolution of display 1,440k dot 1,229k dot
Selfie friendly
Liveview
Touch display
Viewfinder Information
Viewfinder Electronic Electronic
Viewfinder resolution 3,686k dot 2,359k dot
Viewfinder coverage 100 percent 100 percent
Viewfinder magnification 0.78x 0.59x
Features
Minimum shutter speed 30 seconds 30 seconds
Fastest shutter speed 1/8000 seconds 1/2000 seconds
Fastest quiet shutter speed 1/32000 seconds 1/32000 seconds
Continuous shutter speed 20.0 frames/s 16.0 frames/s
Shutter priority
Aperture priority
Manual exposure
Exposure compensation Yes Yes
Set WB
Image stabilization
Integrated flash
Flash range no built-in flash -
Flash settings Flash off, Autoflash, Fill-flash, Slow Sync., Rear Sync., Red-eye reduction, Wireless, Hi-speed sync -
External flash
Auto exposure bracketing
White balance bracketing
Fastest flash sync - 1/2000 seconds
Exposure
Multisegment
Average
Spot
Partial
AF area
Center weighted
Video features
Supported video resolutions - 3840 x 2160 (30p, 25p, 24p), 1920 x 1080 (60p/60i/24p), 1280 x 720 (60p/30p/24p/120p), 1440 x 1080 (30 fps), 640 x 480 (30 fps)
Highest video resolution 3840x2160 3840x2160
Video format MPEG-4, AVCHD, H.264 MPEG-4, AVCHD, XAVC S
Mic jack
Headphone jack
Connectivity
Wireless Built-In Built-In
Bluetooth
NFC
HDMI
USB USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec)
GPS None None
Physical
Environment seal
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 673 gr (1.48 lb) 298 gr (0.66 lb)
Dimensions 127 x 96 x 63mm (5.0" x 3.8" x 2.5") 102 x 58 x 41mm (4.0" x 2.3" x 1.6")
DXO scores
DXO Overall score 92 70
DXO Color Depth score 24.9 22.9
DXO Dynamic range score 13.3 12.6
DXO Low light score 3517 562
Other
Battery life 650 photographs 280 photographs
Style of battery Battery Pack Battery Pack
Battery model NP-FZ100 NP-BX1
Self timer Yes (2, 5, 10 secs + continuous) Yes
Time lapse shooting With downloadable app
Storage media Dual SD/SDHC/SDXC slots (UHS-II compatible) SD/ SDHC/SDXC, Memory Stick Pro Duo/ Pro-HG Duo
Storage slots Dual One
Price at release $4,498 $898