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Olympus E-M1 III vs Sony A7c

Portability
67
Imaging
62
Features
96
Overall
75
Olympus OM-D E-M1 Mark III front
 
Sony Alpha A7c front
Portability
78
Imaging
76
Features
88
Overall
80

Olympus E-M1 III vs Sony A7c 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
  • Introduced February 2020
  • Replaced the Olympus E-M1 II
Sony A7c
(Full Review)
  • 24MP - Full frame Sensor
  • 3" Fully Articulated Display
  • ISO 100 - 51200 (Push to 204800)
  • Sensor based 5-axis Image Stabilization
  • 3840 x 2160 video
  • Sony E Mount
  • 509g - 124 x 71 x 60mm
  • Revealed September 2020
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Olympus E-M1 III vs Sony A7c Overview

Below, we are contrasting the Olympus E-M1 III vs Sony A7c, former is a Pro Mirrorless while the other is a Advanced Mirrorless by competitors Olympus and Sony. The resolution of the E-M1 III (20MP) and the A7c (24MP) is fairly close but the E-M1 III (Four Thirds) and A7c (Full frame) use totally different sensor dimensions.

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The E-M1 III was announced 7 months before the A7c and they are of a similar age. Both cameras come with different body type with the Olympus E-M1 III being a SLR-style mirrorless camera and the Sony A7c being a Rangefinder-style mirrorless camera.

Before going through a in-depth comparison, below is a simple summation of how the E-M1 III scores against the A7c when considering portability, imaging, features and an overall mark.

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Reasons to pick Olympus E-M1 III over the Sony A7c

 E-M1 III A7c 
Display resolution1037k922kSharper display (+115k dot)

Reasons to pick Sony A7c over the Olympus E-M1 III

 A7c E-M1 III 
RevealedSeptember 2020February 2020Newer by 7 months

Common features in the Olympus E-M1 III and Sony A7c

 E-M1 III A7c 
Focus manually Dial exact focus
Display typeFully ArticulatedFully articulatedFully Articulated display
Display dimension3"3"Identical display sizing
Selfie screen Both are selfie friendly
Touch friendly display Easily navigate

Olympus E-M1 III vs Sony A7c Physical Comparison

For those who are going to travel with your camera often, you should consider its weight and measurements. The Olympus E-M1 III offers 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 A7c has proportions of 124mm x 71mm x 60mm (4.9" x 2.8" x 2.4") having a weight of 509 grams (1.12 lbs).

Look at the Olympus E-M1 III vs Sony A7c in our completely new Camera plus Lens Size Comparison Tool. Camera Size Comparison with Lenses

Bear in mind, the weight of an ILC will differ dependant on the lens you are working with at that moment. Here is the front view physical size comparison of the E-M1 III vs the A7c.

Olympus E-M1 III vs Sony A7c size comparison

Taking into consideration dimensions and weight, the portability grade of the E-M1 III and A7c is 67 and 78 respectively.

Olympus E-M1 III vs Sony A7c top view buttons comparison

Olympus E-M1 III vs Sony A7c Sensor Comparison

More often than not, its hard to visualise the contrast in sensor dimensions simply by looking through a spec sheet. The image below should provide you a more clear sense of the sensor sizing in the E-M1 III and A7c.

As you can see, the 2 cameras posses different resolutions and different sensor dimensions. The E-M1 III with its smaller sensor will make getting shallower depth of field more challenging and the Sony A7c will provide you with more detail with its extra 4 Megapixels. Greater resolution will help you crop images somewhat more aggressively. The more aged E-M1 III will be behind in sensor technology.

Olympus E-M1 III vs Sony A7c sensor size comparison

Olympus E-M1 III vs Sony A7c Screen and ViewFinder

Olympus E-M1 III vs Sony A7c Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Olympus E-M1 III Portrait photography advice
Sony A7c Portrait photography advice
77
focusing manually
good megapixels (20MP)
good sensor size (Four Thirds)
supports face detection autofocus
saves RAW formats
78
manual focus
sensor resolution is decent (24MP)
sensor size is large (Full frame)
provides face detection autofocus
delivers RAW formats
no external flash support
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Street Comparison

Olympus E-M1 III Street photography info
Sony A7c Street photography info
78
screen can move to multiple angles
image stabilization (Sensor based 5-axis)
good sensor size (Four Thirds)
saves RAW formats
supports touch focus
environment proof
great high ISO (25,600)
85
has image stabilization (Sensor based 5-axis)
sensor size is large (Full frame)
delivers RAW formats
features touch to focus
weather proofing
great ISO range (51,200)
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Sports Comparison

Sports photography with Olympus E-M1 III
Sports photography with Sony A7c
81
high shutter speed (1/8,000 seconds)
quiet shooting (1/32,000 seconds)
high max frames per second (60.0 frames/s)
image stabilization (Sensor based 5-axis)
good megapixels (20 megapixels)
good sensor size (Four Thirds)
supports tracking autofocus
environment proof
supports phase detect autofocus
88
silent shooting (1/8,000 seconds)
has image stabilization (Sensor based 5-axis)
sensor resolution is decent (24MP)
sensor size is large (Full frame)
provides tracking autofocus
weather proofing
great battery life (740 CIPA)
supports phase detect autofocus
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Travel Comparison

Olympus E-M1 III Travel photography advice
Sony A7c Travel photography advice
79
environment proof
supports bluetooth
supports touch focus
good megapixels (20MP)
screen is selfie friendly
86
great battery life (740 shots)
weather proofing
has bluetooth
features touch to focus
sensor resolution is decent (24MP)
selfie friendly screen
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Landscape Comparison

Landscape photography with Olympus E-M1 III
Landscape photography with Sony A7c
81
focusing manually
switch lenses (Micro Four Thirds mount)
nice screen size (3")
image stabilization (Sensor based 5-axis)
good megapixels (20 megapixels)
good sensor size (Four Thirds)
no anti aliasing filter
great high ISO (25,600)
saves RAW formats
environment proof
2 card slots
88
manual focus
change lenses (Sony E mount)
decent sized screen (3 inches)
has image stabilization (Sensor based 5-axis)
sensor resolution is decent (24 megapixels)
sensor size is large (Full frame)
great ISO range (51,200)
delivers RAW formats
weather proofing
great battery life (740 shots)
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Vlogging Comparison

Olympus E-M1 III Vlogging advice
Sony A7c Vlogging advice
79
screen is selfie friendly
touchscreen enabled
image stabilization (Sensor based 5-axis)
supports face detection autofocus
high video quality (4096 x 2160 resolution)
comes with external microphone support
86
selfie friendly screen
touchscreen
has image stabilization (Sensor based 5-axis)
provides face detection autofocus
high quality video (3840 x 2160 pixels)
comes with external mic support
Photography Glossary

Olympus E-M1 III vs Sony A7c Specifications

Detailed spec comparison table for Olympus E-M1 III and Sony A7c
 Olympus OM-D E-M1 Mark IIISony Alpha A7c
General Information
Manufacturer Olympus Sony
Model type Olympus OM-D E-M1 Mark III Sony Alpha A7c
Type Pro Mirrorless Advanced Mirrorless
Introduced 2020-02-11 2020-09-14
Physical type SLR-style mirrorless Rangefinder-style mirrorless
Sensor Information
Chip TruePic IX -
Sensor type CMOS BSI-CMOS
Sensor size Four Thirds Full frame
Sensor dimensions 17.4 x 13mm 35.8 x 23.8mm
Sensor surface area 226.2mm² 852.0mm²
Sensor resolution 20 megapixels 24 megapixels
Anti alias filter
Aspect ratio 4:3 3:2 and 16:9
Peak resolution 5184 x 3888 6000 x 4000
Highest native ISO 25600 51200
Highest enhanced ISO - 204800
Min native ISO 200 100
RAW files
Min enhanced ISO 64 50
Autofocusing
Manual focusing
Touch to focus
AF continuous
AF single
Tracking AF
AF selectice
AF center weighted
Multi area AF
Live view AF
Face detection AF
Contract detection AF
Phase detection AF
Total focus points 121 693
Cross type focus points 121 -
Lens
Lens support Micro Four Thirds Sony E
Amount of lenses 107 122
Crop factor 2.1 1
Screen
Screen type Fully Articulated Fully articulated
Screen diagonal 3 inches 3 inches
Resolution of screen 1,037k dots 922k dots
Selfie friendly
Liveview
Touch function
Viewfinder Information
Viewfinder type Electronic Electronic
Viewfinder resolution 2,360k dots 2,360k dots
Viewfinder coverage 100 percent 100 percent
Viewfinder magnification 0.74x 0.59x
Features
Minimum shutter speed 60s 30s
Fastest shutter speed 1/8000s 1/4000s
Fastest silent shutter speed 1/32000s 1/8000s
Continuous shutter rate 60.0 frames/s 10.0 frames/s
Shutter priority
Aperture priority
Manual mode
Exposure compensation Yes Yes
Change WB
Image stabilization
Built-in flash
Flash distance 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
AEB
WB bracketing
Fastest flash synchronize 1/250s -
Exposure
Multisegment
Average
Spot
Partial
AF area
Center weighted
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 @ 30p / 100 Mbps, XAVC S, MP4, H.264, Linear PCM
Highest video resolution 4096x2160 3840x2160
Video format MPEG-4, H.264 MPEG-4, XAVC S, H.264
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
Environment sealing
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 580g (1.28 pounds) 509g (1.12 pounds)
Dimensions 134 x 91 x 69mm (5.3" x 3.6" x 2.7") 124 x 71 x 60mm (4.9" x 2.8" x 2.4")
DXO scores
DXO Overall rating not tested not tested
DXO Color Depth rating not tested not tested
DXO Dynamic range rating not tested not tested
DXO Low light rating not tested not tested
Other
Battery life 420 photos 740 photos
Battery style Battery Pack Battery Pack
Battery ID BLH-1 NP-FZ100
Self timer Yes (2 or 12 secs, custom) Yes (2 or 10 sec; continuous (3 or 5 exposures))
Time lapse shooting
Storage type Dual SD/SDHC/SDXC slots (UHS-II on first slot) SD/SDHC/SDXC card (UHS-II supported)
Card slots 2 Single
Price at release $1,800 $1,800