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Olympus E-M1 III vs Pentax K-S1

Portability
67
Imaging
62
Features
96
Overall
75
Olympus OM-D E-M1 Mark III front
 
Pentax K-S1 front
Portability
69
Imaging
63
Features
70
Overall
65

Olympus E-M1 III vs Pentax K-S1 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
  • Earlier Model is Olympus E-M1 II
Pentax K-S1
(Full Review)
  • 20MP - APS-C Sensor
  • 3" Fixed Display
  • ISO 100 - 51200
  • Sensor based Image Stabilization
  • No Anti-Alias Filter
  • 1/6000s Max Shutter
  • 1920 x 1080 video
  • Pentax KAF2 Mount
  • 558g - 121 x 93 x 70mm
  • Revealed August 2014
  • Successor is Pentax K-S2
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Olympus E-M1 III vs Pentax K-S1 Overview

The following is a complete review of the Olympus E-M1 III vs Pentax K-S1, one is a Pro Mirrorless and the other is a Advanced DSLR by manufacturers Olympus and Pentax. The image resolution of the E-M1 III (20MP) and the K-S1 (20MP) is fairly close but the E-M1 III (Four Thirds) and K-S1 (APS-C) posses different sensor dimensions.

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The E-M1 III was unveiled 5 years after the K-S1 which is a fairly serious gap as far as camera technology is concerned. Both of these cameras have different body design with the Olympus E-M1 III being a SLR-style mirrorless camera and the Pentax K-S1 being a Mid-size SLR camera.

Before we go right into a comprehensive comparison, here is a short introduction of how the E-M1 III matches up vs the K-S1 in terms of portability, imaging, features and an overall mark.

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Reasons to pick Olympus E-M1 III over the Pentax K-S1

 E-M1 III K-S1 
RevealedFebruary 2020August 2014Newer by 67 months
Display typeFully ArticulatedFixed Fully Articulating display
Display resolution1037k921kSharper display (+116k dot)
Selfie screen Take selfies
Touch display Easily navigate

Reasons to pick Pentax K-S1 over the Olympus E-M1 III

 K-S1 E-M1 III 

Common features in the Olympus E-M1 III and Pentax K-S1

 E-M1 III K-S1 
Focus manually More precise focus
Display dimensions3"3"Equal display sizing

Olympus E-M1 III vs Pentax K-S1 Physical Comparison

If you're intending to travel with your camera often, you will want to factor its weight and proportions. The Olympus E-M1 III has external dimensions of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") accompanied by a weight of 580 grams (1.28 lbs) and the Pentax K-S1 has measurements of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") along with a weight of 558 grams (1.23 lbs).

Analyze the Olympus E-M1 III vs Pentax K-S1 in the latest Camera and Lens Size Comparison Tool. Camera Size Comparison with Lenses

Keep in mind, the weight of an Interchangeable Lens Camera will change based on the lens you choose during that time. Following is a front view over all size comparison of the E-M1 III versus the K-S1.

Olympus E-M1 III vs Pentax K-S1 size comparison

Taking into consideration dimensions and weight, the portability score of the E-M1 III and K-S1 is 67 and 69 respectively.

Olympus E-M1 III vs Pentax K-S1 top view buttons comparison

Olympus E-M1 III vs Pentax K-S1 Sensor Comparison

Sometimes, its tough to picture the gap in sensor dimensions purely by viewing technical specs. The image here might give you a far better sense of the sensor sizes in the E-M1 III and K-S1.

As you have seen, both of these cameras have the same megapixel count but different sensor dimensions. The E-M1 III includes the smaller sensor which is going to make obtaining shallow depth of field harder. The fresher E-M1 III should have an advantage in sensor technology.

Olympus E-M1 III vs Pentax K-S1 sensor size comparison

Olympus E-M1 III vs Pentax K-S1 Screen and ViewFinder

Olympus E-M1 III vs Pentax K-S1 Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Olympus E-M1 III as a Portrait photography camera
Pentax K-S1 as a Portrait photography camera
77
you can focus manually
megapixel count decent (20 megapixels)
nice sensor size (Four Thirds)
has face detection autofocus
supports RAW files
77
manual focus
MP count decent (20 megapixels)
sensor size is decent (APS-C)
offers face detection focus
exports RAW formats
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Street Comparison

Olympus E-M1 III Street photography features
Pentax K-S1 Street photography features
78
screen articulates fully
image stabilization (Sensor based 5-axis)
nice sensor size (Four Thirds)
supports RAW files
includes touch to focus
environment proof
great ISO range (25,600)
73
image stabilization (Sensor based)
sensor size is decent (APS-C)
exports RAW formats
lighter than average (558g)
great ISO range (51,200)
fixed screen
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Sports Comparison

Sports photography with Olympus E-M1 III
Sports photography with Pentax K-S1
81
great max shutter speed (1/8,000s)
silent shooting (1/32,000s)
fast shooting (60.0 frames per second)
image stabilization (Sensor based 5-axis)
megapixel count decent (20MP)
nice sensor size (Four Thirds)
has tracking autofocus
environment proof
has phase detect autofocus
69
high shutter speed (1/6,000 seconds)
image stabilization (Sensor based)
MP count decent (20 megapixels)
sensor size is decent (APS-C)
offers tracking autofocus
sensor has phase detect auto focus
max frames per second low (5.4 frames/s)
terrible battery power (410 per charge)
Photography Glossary

Travel Comparison

Olympus E-M1 III Travel photography advice
Pentax K-S1 Travel photography advice
79
environment proof
has bluetooth
includes touch to focus
megapixel count decent (20MP)
screen is selfie friendly
60
lighter than average (558 grams)
MP count decent (20 megapixels)
built-in flash
no Time Lapse mode
terrible battery power (410 CIPA)
screen is not selfie friendly
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Landscape Comparison

Olympus E-M1 III Landscape photography advice
Pentax K-S1 Landscape photography advice
81
you can focus manually
change lenses (Micro Four Thirds mount)
screen size is decent (3")
image stabilization (Sensor based 5-axis)
megapixel count decent (20MP)
nice sensor size (Four Thirds)
no anti-alias filter
great ISO range (25,600)
supports RAW files
environment proof
2 card slots
73
manual focus
swap lenses (Pentax KAF2 mount)
screen is a decent size (3")
image stabilization (Sensor based)
MP count decent (20MP)
sensor size is decent (APS-C)
doesnt have anti aliasing filter
great ISO range (51,200)
exports RAW formats
terrible battery power (410 shots)
no Time Lapse mode
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Vlogging Comparison

Olympus E-M1 III Vlogging information
Pentax K-S1 Vlogging information
79
screen is selfie friendly
touchscreen enabled
image stabilization (Sensor based 5-axis)
has face detection autofocus
high res video (4096 x 2160 pixels)
has external microphone support
33
image stabilization (Sensor based)
offers face detection focus
high res video (1920 x 1080 pixels)
lighter than average (558 grams)
screen is not selfie friendly
no external mic support
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Olympus E-M1 III vs Pentax K-S1 Specifications

Detailed spec comparison table for Olympus E-M1 III and Pentax K-S1
 Olympus OM-D E-M1 Mark IIIPentax K-S1
General Information
Make Olympus Pentax
Model type Olympus OM-D E-M1 Mark III Pentax K-S1
Class Pro Mirrorless Advanced DSLR
Launched 2020-02-11 2014-08-27
Physical type SLR-style mirrorless Mid-size SLR
Sensor Information
Powered by TruePic IX Prime MII
Sensor type CMOS CMOS
Sensor size Four Thirds APS-C
Sensor dimensions 17.4 x 13mm 23.5 x 15.6mm
Sensor surface area 226.2mm² 366.6mm²
Sensor resolution 20 megapixel 20 megapixel
Anti alias filter
Aspect ratio 4:3 3:2
Maximum resolution 5184 x 3888 5472 x 3648
Maximum native ISO 25600 51200
Lowest native ISO 200 100
RAW support
Lowest boosted ISO 64 -
Autofocusing
Manual focusing
Touch focus
AF continuous
AF single
Tracking AF
AF selectice
Center weighted AF
Multi area AF
Live view AF
Face detection AF
Contract detection AF
Phase detection AF
Total focus points 121 11
Cross type focus points 121 -
Lens
Lens mount type Micro Four Thirds Pentax KAF2
Number of lenses 107 151
Crop factor 2.1 1.5
Screen
Screen type Fully Articulated Fixed Type
Screen size 3 inches 3 inches
Resolution of screen 1,037 thousand dots 921 thousand dots
Selfie friendly
Liveview
Touch capability
Viewfinder Information
Viewfinder Electronic Optical (pentaprism)
Viewfinder resolution 2,360 thousand dots -
Viewfinder coverage 100% 100%
Viewfinder magnification 0.74x 0.64x
Features
Lowest shutter speed 60s 30s
Highest shutter speed 1/8000s 1/6000s
Highest silent shutter speed 1/32000s -
Continuous shooting rate 60.0 frames per sec 5.4 frames per sec
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation Yes Yes
Custom WB
Image stabilization
Integrated flash
Flash distance no built-in flash 10.00 m (at ISO 100)
Flash options Redeye, Fill-in, Flash Off, Red-eye Slow sync.(1st curtain), Slow sync.(1st curtain), Slow sync.(2nd curtain), Manual Auto, auto + redeye, on, on + redeye reduction, slow sync, trailing curtain sync, manual
External flash
AEB
WB bracketing
Highest flash synchronize 1/250s -
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
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 1920 x 1080 (30,25,24 fps), 1280 x 720 (60,50 fps)
Maximum video resolution 4096x2160 1920x1080
Video data format MPEG-4, H.264 H.264
Mic support
Headphone support
Connectivity
Wireless Built-In Eye-Fi Connected
Bluetooth
NFC
HDMI
USB USB 3.1 Gen 1 (5 GBit/sec) USB 2.0 (480 Mbit/sec)
GPS None Optional
Physical
Environment sealing
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 580 grams (1.28 pounds) 558 grams (1.23 pounds)
Physical dimensions 134 x 91 x 69mm (5.3" x 3.6" x 2.7") 121 x 93 x 70mm (4.8" x 3.7" x 2.8")
DXO scores
DXO All around rating not tested 78
DXO Color Depth rating not tested 23.5
DXO Dynamic range rating not tested 13.0
DXO Low light rating not tested 1061
Other
Battery life 420 photos 410 photos
Form of battery Battery Pack Battery Pack
Battery ID BLH-1 D-LI109
Self timer Yes (2 or 12 secs, custom) Yes ( 2 or 12 seconds)
Time lapse shooting
Storage type Dual SD/SDHC/SDXC slots (UHS-II on first slot) SD/SDHC/SDXC
Card slots Two Single
Price at launch $1,800 $339