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Olympus E-M1 III vs Sony A7S III

Portability
67
Imaging
62
Features
96
Overall
75
Olympus OM-D E-M1 Mark III front
 
Sony Alpha A7S III front
Portability
61
Imaging
65
Features
92
Overall
75

Olympus E-M1 III vs Sony A7S III Key Specs

Olympus E-M1 III
(Full Review)
  • 20MP - Four Thirds Sensor
  • 3" Fully Articulated Screen
  • ISO 200 - 25600
  • Sensor based 5-axis Image Stabilization
  • No Anti-Alias Filter
  • 1/8000s Max Shutter
  • 4096 x 2160 video
  • Micro Four Thirds Mount
  • 580g - 134 x 91 x 69mm
  • Launched February 2020
  • Succeeded the Olympus E-M1 II
Sony A7S III
(Full Review)
  • 12MP - Full frame Sensor
  • 3" Fully Articulated Display
  • ISO 80 - 102400 (Expand to 409600)
  • Sensor based 5-axis Image Stabilization
  • 1/8000s Max Shutter
  • 3840 x 2160 video
  • Sony E Mount
  • 699g - 129 x 97 x 81mm
  • Launched July 2020
  • Succeeded the Sony A7S II
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Olympus E-M1 III vs Sony A7S III Overview

Below is a complete review of the Olympus E-M1 III versus Sony A7S III, both Pro Mirrorless cameras by companies Olympus and Sony. There exists a huge gap among the resolutions of the E-M1 III (20MP) and A7S III (12MP) and the E-M1 III (Four Thirds) and A7S III (Full frame) feature different sensor size.

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The E-M1 III was unveiled 5 months earlier than the A7S III so they are both of a similar generation. The two cameras come with the identical body type (SLR-style mirrorless).

Before getting through a complete comparison, below is a quick summary of how the E-M1 III grades versus the A7S III in terms of portability, imaging, features and an overall grade.

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Reasons to pick Olympus E-M1 III over the Sony A7S III

 E-M1 III A7S III 

Reasons to pick Sony A7S III over the Olympus E-M1 III

 A7S III E-M1 III 
Display resolution1440k1037kSharper display (+403k dot)

Common features in the Olympus E-M1 III and Sony A7S III

 E-M1 III A7S III 
LaunchedFebruary 2020July 2020Same generation
Manually focus More precise focus
Display typeFully ArticulatedFully articulatedFully Articulated display
Display dimension3"3"Identical display size
Selfie screen Both good for selfies
Touch friendly display Easily navigate

Olympus E-M1 III vs Sony A7S III Physical Comparison

For anyone who is looking to lug around your camera often, you'll have to factor in its weight and dimensions. The Olympus E-M1 III features exterior measurements of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") and a weight of 580 grams (1.28 lbs) while the Sony A7S III has dimensions of 129mm x 97mm x 81mm (5.1" x 3.8" x 3.2") with a weight of 699 grams (1.54 lbs).

Take a look at the Olympus E-M1 III versus Sony A7S III in the all new Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses

Take into consideration, the weight of an Interchangeable Lens Camera will vary based on the lens you are working with at that time. Below is the front view overall size comparison of the E-M1 III compared to the A7S III.

Olympus E-M1 III vs Sony A7S III size comparison

Taking into account dimensions and weight, the portability rating of the E-M1 III and A7S III is 67 and 61 respectively.

Olympus E-M1 III vs Sony A7S III top view buttons comparison

Olympus E-M1 III vs Sony A7S III Sensor Comparison

Sometimes, its hard to imagine the gap in sensor measurements purely by going through a spec sheet. The photograph underneath should provide you a more clear sense of the sensor measurements in the E-M1 III and A7S III.

As you can see, both of these cameras posses different megapixel count and different sensor measurements. The E-M1 III using its smaller sensor is going to make shooting shallower DOF trickier and the Olympus E-M1 III will show more detail having an extra 8MP. Greater resolution will also help you crop pics somewhat more aggressively.

Olympus E-M1 III vs Sony A7S III sensor size comparison

Olympus E-M1 III vs Sony A7S III Screen and ViewFinder

Olympus E-M1 III vs Sony A7S III Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Olympus E-M1 III as a Portrait photography camera
Sony A7S III as a Portrait photography camera
77
has manual focus
good MP (20 megapixels)
sensor size is decent (Four Thirds)
supports face detect focus
exports RAW files
71
manual focus
great sensor size (Full frame)
has face detect autofocus
saves RAW files
sensor resolution not great (12 megapixels)
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Street Comparison

Olympus E-M1 III Street photography advice
Sony A7S III Street photography advice
78
screen articulates
has image stabilization (Sensor based 5-axis)
sensor size is decent (Four Thirds)
exports RAW files
provides focus by touch
environment proofing
great ISO range (25,600)
76
built in image stabilization (Sensor based 5-axis)
great sensor size (Full frame)
saves RAW files
offers touch to focus
environment proof
great ISO range (102,400)
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Sports Comparison

Olympus E-M1 III Sports photography details
Sony A7S III Sports photography details
81
maximum shutter speed is high (1/8,000 seconds)
quiet shutter (1/32,000 seconds)
high fps (60.0 fps)
has image stabilization (Sensor based 5-axis)
good MP (20MP)
sensor size is decent (Four Thirds)
supports tracking focus
environment proofing
comes with phase detect auto focus
76
great max shutter speed (1/8,000s)
built in image stabilization (Sensor based 5-axis)
great sensor size (Full frame)
has tracking focus
environment proof
great battery (600 CIPA)
sensor has phase detect autofocus
sensor resolution not great (12MP)
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Travel Comparison

Olympus E-M1 III as a Travel photography camera
Sony A7S III as a Travel photography camera
79
environment proofing
supports bluetooth
provides focus by touch
good MP (20 megapixels)
screen is selfie friendly
70
great battery (600 CIPA)
environment proof
connects via bluetooth
offers touch to focus
screen is selfie friendly
sensor resolution not great (12 megapixels)
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Landscape Comparison

Olympus E-M1 III Landscape photography highlights
Sony A7S III Landscape photography highlights
81
has manual focus
switch lenses (Micro Four Thirds mount)
nice screen size (3")
has image stabilization (Sensor based 5-axis)
good MP (20 megapixels)
sensor size is decent (Four Thirds)
no anti aliasing filter
great ISO range (25,600)
exports RAW files
environment proofing
2 card slots
77
manual focus
change lenses (Sony E mount)
decent sized screen (3 inch)
built in image stabilization (Sensor based 5-axis)
great sensor size (Full frame)
great ISO range (102,400)
saves RAW files
environment proof
great battery (600 CIPA)
2 card slots
sensor resolution not great (12 megapixels)
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Vlogging Comparison

Olympus E-M1 III Vlogging highlights
Sony A7S III Vlogging highlights
79
screen is selfie friendly
touchscreen capability
has image stabilization (Sensor based 5-axis)
supports face detect focus
video res high (4096 x 2160 pxls)
does have microphone support
77
screen is selfie friendly
touchscreen
built in image stabilization (Sensor based 5-axis)
has face detect autofocus
video res high (3840 x 2160 pxls)
includes mic support
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Olympus E-M1 III vs Sony A7S III Specifications

Detailed spec comparison table for Olympus E-M1 III and Sony A7S III
 Olympus OM-D E-M1 Mark IIISony Alpha A7S III
General Information
Brand Olympus Sony
Model Olympus OM-D E-M1 Mark III Sony Alpha A7S III
Category Pro Mirrorless Pro Mirrorless
Launched 2020-02-11 2020-07-21
Physical type SLR-style mirrorless SLR-style mirrorless
Sensor Information
Processor Chip TruePic IX Bionz XR
Sensor type CMOS BSI-CMOS
Sensor size Four Thirds Full frame
Sensor dimensions 17.4 x 13mm 35.6 x 23.8mm
Sensor 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 - 409600
Min native ISO 200 80
RAW support
Min boosted ISO 64 50
Autofocusing
Manual focus
Touch to focus
Autofocus continuous
Autofocus single
Tracking autofocus
Selective autofocus
Center weighted autofocus
Multi area autofocus
Autofocus live view
Face detection focus
Contract detection focus
Phase detection focus
Number of focus points 121 759
Cross focus points 121 -
Lens
Lens mount Micro Four Thirds Sony E
Total lenses 107 121
Focal length multiplier 2.1 1
Screen
Screen type Fully Articulated Fully articulated
Screen diagonal 3 inches 3 inches
Screen resolution 1,037 thousand dots 1,440 thousand dots
Selfie friendly
Liveview
Touch operation
Viewfinder Information
Viewfinder type Electronic Electronic
Viewfinder resolution 2,360 thousand dots 9,440 thousand dots
Viewfinder coverage 100% 100%
Viewfinder magnification 0.74x 0.91x
Features
Slowest shutter speed 60 secs 30 secs
Maximum shutter speed 1/8000 secs 1/8000 secs
Maximum silent shutter speed 1/32000 secs -
Continuous shooting rate 60.0 frames per sec 10.0 frames per sec
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation Yes Yes
Set white balance
Image stabilization
Built-in flash
Flash range no built-in flash no built-in flash
Flash modes Redeye, Fill-in, Flash Off, Red-eye Slow sync.(1st curtain), Slow sync.(1st curtain), Slow sync.(2nd curtain), Manual no built-in flash
External flash
Auto exposure bracketing
White balance bracketing
Maximum 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 4096 x 2160 @ 24p / 237 Mbps, MOV, H.264, Linear PCM3840 x 2160 @ 30p / 102 Mbps, MOV, H.264, Linear PCM3840 x 2160 @ 25p / 102 Mbps, MOV, H.264, Linear PCM3840 x 2160 @ 23.98p / 102 Mbps, MOV, H.264, Linear PCM1920 x 1080 @ 60p, MOV, H.264, Linear PCM1920 x 1080 @ 50p, MOV, H.264, Linear PCM1920 x 1080 @ 30p, MOV, H.264, Linear PCM1920 x 1080 @ 25p, MOV, H.264, Linear PCM1920 x 1080 @ 23.98p, MOV, H.264, Linear PCM 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 format MPEG-4, H.264 MPEG-4, XAVC S, XAVC HS, XAVC S-1, H.264, H.265
Mic 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 580g (1.28 lb) 699g (1.54 lb)
Dimensions 134 x 91 x 69mm (5.3" x 3.6" x 2.7") 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 420 photos 600 photos
Battery style Battery Pack Battery Pack
Battery model BLH-1 NP-FZ100
Self timer Yes (2 or 12 secs, custom) Yes (2 or 10 sec; continuous (3 or 5 exposures))
Time lapse feature With downloadable app
Storage type Dual SD/SDHC/SDXC slots (UHS-II on first slot) Dual SD/CFexpress Type A slots
Card slots Two Two
Launch pricing $1,800 $3,499