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OM System OM-1 vs Sony A7S III

Portability
65
Imaging
64
Features
96
Overall
76
OM System OM-1 front
 
Sony Alpha A7S III front
Portability
61
Imaging
65
Features
92
Overall
75

OM System OM-1 vs Sony A7S III Key Specs

OM System OM-1
(Full Review)
  • 20MP - Four Thirds Sensor
  • 3.00" Fully Articulated Display
  • ISO 200 - 25600 (Push to 102400)
  • Sensor based 5-axis Image Stabilization
  • No Anti-Alias Filter
  • 1/8000s Max Shutter
  • 4096 x 2160 video
  • Micro Four Thirds Mount
  • 599g - 135 x 92 x 73mm
  • Released February 2022
Sony A7S III
(Full Review)
  • 12MP - Full frame Sensor
  • 3" Fully Articulated Screen
  • ISO 80 - 102400 (Expand to 409600)
  • Sensor based 5-axis Image Stabilization
  • 1/8000s Maximum Shutter
  • 3840 x 2160 video
  • Sony E Mount
  • 699g - 129 x 97 x 81mm
  • Launched July 2020
  • Earlier Model is Sony A7S II
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OM System OM-1 vs Sony A7S III Overview

Lets look a bit more closely at the OM System OM-1 vs Sony A7S III, both Pro Mirrorless digital cameras by manufacturers Olympus and Sony. There exists a large gap between the sensor resolutions of the OM System OM-1 (20MP) and A7S III (12MP) and the OM System OM-1 (Four Thirds) and A7S III (Full frame) possess different sensor measurements.

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The OM System OM-1 was introduced 20 months later than the A7S III which makes the cameras a generation apart from one another. Each of these cameras offer the identical body type (SLR-style mirrorless).

Before we go in to a in depth comparison, below is a quick summation of how the OM System OM-1 matches up vs the A7S III with respect to portability, imaging, features and an overall grade.

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Reasons to pick OM System OM-1 over the Sony A7S III

 OM System OM-1 A7S III 
LaunchedFebruary 2022July 2020More recent by 20 months
Screen resolution1620k1440kCrisper screen (+180k dot)

Reasons to pick Sony A7S III over the OM System OM-1

 A7S III OM System OM-1 

Common features in the OM System OM-1 and Sony A7S III

 OM System OM-1 A7S III 
Manual focus More accurate focus
Screen typeFully ArticulatedFully articulatedFully Articulated screen
Screen sizing3.00"3"Equivalent screen measurements
Selfie screen Both are selfie friendly
Touch friendly screen Quickly navigate

OM System OM-1 vs Sony A7S III Physical Comparison

If you are going to lug around your camera, you need to think about its weight and size. The OM System OM-1 offers outer measurements of 135mm x 92mm x 73mm (5.3" x 3.6" x 2.9") along with a weight of 599 grams (1.32 lbs) while the Sony A7S III has specifications of 129mm x 97mm x 81mm (5.1" x 3.8" x 3.2") and a weight of 699 grams (1.54 lbs).

Contrast the OM System OM-1 vs Sony A7S III in our completely new Camera & Lens Size Comparison Tool. Camera Size Comparison with Lenses

Remember, the weight of an ILC will change dependant on the lens you choose during that time. Below is the front view measurements comparison of the OM System OM-1 vs the A7S III.

OM System OM-1 vs Sony A7S III size comparison

Factoring in dimensions and weight, the portability rating of the OM System OM-1 and A7S III is 65 and 61 respectively.

OM System OM-1 vs Sony A7S III top view buttons comparison

OM System OM-1 vs Sony A7S III Sensor Comparison

More often than not, it is very difficult to visualize the difference between sensor measurements merely by reading specs. The graphic below might give you a far better sense of the sensor sizing in the OM System OM-1 and A7S III.

All in all, both the cameras offer different megapixel count and different sensor measurements. The OM System OM-1 having a tinier sensor is going to make achieving shallower depth of field harder and the OM System OM-1 will offer you more detail using its extra 8 Megapixels. Higher resolution can also enable you to crop photographs a little more aggressively. The newer OM System OM-1 should have an edge in sensor technology.

OM System OM-1 vs Sony A7S III sensor size comparison

OM System OM-1 vs Sony A7S III Screen and ViewFinder

OM System OM-1 vs Sony A7S III Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

OM System OM-1 Portrait photography details
Sony A7S III Portrait photography details
78
has manual focus
resolution is good (20MP)
sensor size is nice (Four Thirds)
includes face detect focusing
delivers RAW formats
71
focusing manually
sensor size is big (Full frame)
includes face detect focusing
exports RAW files
low resolution (12MP)
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Street Comparison

OM System OM-1 Street photography information
Sony A7S III Street photography information
77
screen articulates fully
built in image stabilization (Sensor based 5-axis)
sensor size is nice (Four Thirds)
delivers RAW formats
supports touch to focus
environment proof
good ISO range (25,600)
76
has image stabilization (Sensor based 5-axis)
sensor size is big (Full frame)
exports RAW files
offers touch focus
environment proofing
great high ISO (102,400)
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Sports Comparison

OM System OM-1 Sports photography information
Sony A7S III Sports photography information
82
maximum shutter speed is high (1/8,000 seconds)
quiet shooting (1/32,000 seconds)
built in image stabilization (Sensor based 5-axis)
resolution is good (20 megapixels)
sensor size is nice (Four Thirds)
includes tracking focus
environment proof
great battery life (520 per charge)
supports phase detect AF
76
maximum shutter speed is high (1/8,000 seconds)
has image stabilization (Sensor based 5-axis)
sensor size is big (Full frame)
includes tracking focus
environment proofing
good battery power (600 per charge)
sensor has phase detect AF
low resolution (12MP)
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Travel Comparison

OM System OM-1 Travel photography features
Sony A7S III Travel photography features
78
great battery life (520 shots)
environment proof
has bluetooth
supports touch to focus
resolution is good (20 megapixels)
selfie friendly screen
70
good battery power (600 CIPA)
environment proofing
has bluetooth
offers touch focus
display is selfie friendly
low resolution (12 megapixels)
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Landscape Comparison

OM System OM-1 as a Landscape photography camera
Sony A7S III as a Landscape photography camera
82
has manual focus
switch lenses (Micro Four Thirds mount)
screen is a good size (3.00 inches)
built in image stabilization (Sensor based 5-axis)
resolution is good (20 megapixels)
sensor size is nice (Four Thirds)
does not have low pass filter
good ISO range (25,600)
delivers RAW formats
environment proof
great battery life (520 per charge)
has dual storage slots
77
focusing manually
switch lenses (Sony E mount)
good sized screen (3")
has image stabilization (Sensor based 5-axis)
sensor size is big (Full frame)
great high ISO (102,400)
exports RAW files
environment proofing
good battery power (600 per charge)
2 card slots
low resolution (12MP)
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Vlogging Comparison

Vlogging with OM System OM-1
Vlogging with Sony A7S III
78
selfie friendly screen
touchscreen
built in image stabilization (Sensor based 5-axis)
includes face detect focusing
video res high (4096 x 2160 pxls)
comes with microphone jack
77
display is selfie friendly
built-in touchscreen
has image stabilization (Sensor based 5-axis)
includes face detect focusing
video res high (3840 x 2160 pixels)
includes microphone support
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OM System OM-1 vs Sony A7S III Specifications

Detailed spec comparison table for OM System OM-1 and Sony A7S III
 OM System OM-1Sony Alpha A7S III
General Information
Make Olympus Sony
Model OM System OM-1 Sony Alpha A7S III
Category Pro Mirrorless Pro Mirrorless
Released 2022-02-15 2020-07-21
Physical type SLR-style mirrorless SLR-style mirrorless
Sensor Information
Processor Chip - Bionz XR
Sensor type Stacked BSI Live MOS Sensor BSI-CMOS
Sensor size Four Thirds Full frame
Sensor measurements 17.4 x 13mm 35.6 x 23.8mm
Sensor surface area 226.2mm² 847.3mm²
Sensor resolution 20 megapixel 12 megapixel
Anti aliasing filter
Aspect ratio 4:3 3:2 and 16:9
Maximum resolution 5184 x 3888 4240 x 2832
Maximum native ISO 25600 102400
Maximum boosted ISO 102400 409600
Min native ISO 200 80
RAW pictures
Min boosted ISO 80 50
Autofocusing
Focus manually
Autofocus touch
Autofocus continuous
Single autofocus
Autofocus tracking
Selective autofocus
Center weighted autofocus
Multi area autofocus
Autofocus live view
Face detect focus
Contract detect focus
Phase detect focus
Number of focus points 1053 759
Cross focus points 1053 -
Lens
Lens mounting type Micro Four Thirds Sony E
Total lenses 118 121
Focal length multiplier 2.1 1
Screen
Type of display Fully Articulated Fully articulated
Display sizing 3.00 inches 3 inches
Resolution of display 1,620 thousand dots 1,440 thousand dots
Selfie friendly
Liveview
Touch friendly
Viewfinder Information
Viewfinder Electronic Electronic
Viewfinder resolution 5,760 thousand dots 9,440 thousand dots
Viewfinder coverage 100% 100%
Viewfinder magnification 0.83x 0.91x
Features
Lowest shutter speed 60 secs 30 secs
Highest shutter speed 1/8000 secs 1/8000 secs
Highest quiet shutter speed 1/32000 secs -
Continuous shooting rate 10.0 frames per sec 10.0 frames per sec
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation Yes Yes
Custom white balance
Image stabilization
Integrated flash
Flash range no built-in flash no built-in flash
Flash settings Redeye, Fill-in, Flash Off, Red-eye Slow sync.(1st curtain), Slow sync.(1st curtain), Slow sync.(2nd curtain), Manual no built-in flash
Hot shoe
AEB
WB bracketing
Highest flash synchronize 1/250 secs -
Exposure
Multisegment metering
Average metering
Spot metering
Partial metering
AF area metering
Center weighted metering
Video features
Supported video resolutions - 3840 x 2160 @ 120p / 280 Mbps, XAVC S, MP4, H.265, Linear PCM 3840 x 2160 @ 100p / 280 Mbps, XAVC S, MP4, H.265, Linear PCM 3840 x 2160 @ 60p / 200 Mbps, XAVC S, MP4, H.265, Linear PCM 3840 x 2160 @ 50p / 200 Mbps, XAVC S, MP4, H.265, Linear PCM 3840 x 2160 @ 30p / 140 Mbps, XAVC S, MP4, H.265, Linear PCM 3840 x 2160 @ 25p / 140 Mbps, XAVC S, MP4, H.265, Linear PCM 3840 x 2160 @ 24p / 100 Mbps, XAVC S, MP4, H.265, Linear PCM 1920 x 1080 @ 120p / 100 Mbps, XAVC S, MP4, H.264, Linear PCM 1920 x 1080 @ 100p / 100 Mbps, XAVC S, MP4, H.264, Linear PCM 1920 x 1080 @ 60p / 50 Mbps, XAVC S, MP4, H.264, Linear PCM 1920 x 1080 @ 50p / 50 Mbps, XAVC S, MP4, H.264, Linear PCM 1920 x 1080 @ 25p / 50 Mbps, XAVC S, MP4, H.264, Linear PCM 1920 x 1080 @ 24p / 50 Mbps, XAVC S, MP4, H.264, Linear PCM
Maximum video resolution 4096x2160 3840x2160
Video file format MPEG-4, H.264, H.265, HEVC MPEG-4, XAVC S, XAVC HS, XAVC S-1, H.264, H.265
Microphone support
Headphone support
Connectivity
Wireless Built-In Built-In
Bluetooth
NFC
HDMI
USB USB 3.1 Gen 1 (5 GBit/sec) USB 3.2 Gen 1 (5 GBit/sec)
GPS None None
Physical
Environmental sealing
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 599g (1.32 lbs) 699g (1.54 lbs)
Dimensions 135 x 92 x 73mm (5.3" x 3.6" x 2.9") 129 x 97 x 81mm (5.1" x 3.8" x 3.2")
DXO scores
DXO All around score not tested 85
DXO Color Depth score not tested 23.6
DXO Dynamic range score not tested 13.3
DXO Low light score not tested 2993
Other
Battery life 520 images 600 images
Battery style Battery Pack Battery Pack
Battery model BLX-1 NP-FZ100
Self timer Yes (2 or 12 secs, custom) Yes (2 or 10 sec; continuous (3 or 5 exposures))
Time lapse recording With downloadable app
Storage type Dual SD/SDHC/SDXC slots (UHS-II on first slot) Dual SD/CFexpress Type A slots
Card slots Dual Dual
Retail cost $2,199 $3,499