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Olympus E-M10 III vs Pentax K-S1

Portability
80
Imaging
55
Features
75
Overall
63
Olympus OM-D E-M10 Mark III front
 
Pentax K-S1 front
Portability
69
Imaging
63
Features
70
Overall
65

Olympus E-M10 III vs Pentax K-S1 Key Specs

Olympus E-M10 III
(Full Review)
  • 16MP - Four Thirds Sensor
  • 3" Tilting Screen
  • ISO 200 - 25600
  • Sensor based 5-axis Image Stabilization
  • 3840 x 2160 video
  • Micro Four Thirds Mount
  • 410g - 122 x 84 x 50mm
  • Announced August 2017
  • Superseded the Olympus E-M10 II
  • Replacement is Olympus E-M10 IV
Pentax K-S1
(Full Review)
  • 20MP - APS-C Sensor
  • 3" Fixed Screen
  • 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
  • New Model is Pentax K-S2
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Olympus E-M10 III vs Pentax K-S1 Overview

Below, we will be reviewing the Olympus E-M10 III vs Pentax K-S1, one is a Entry-Level Mirrorless and the latter is a Advanced DSLR by rivals Olympus and Pentax. The resolution of the E-M10 III (16MP) and the K-S1 (20MP) is pretty comparable but the E-M10 III (Four Thirds) and K-S1 (APS-C) feature totally different sensor sizing.

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The E-M10 III was released 3 years after the K-S1 which is a fairly serious gap as far as camera tech is concerned. Both of the cameras come with different body type with the Olympus E-M10 III being a SLR-style mirrorless camera and the Pentax K-S1 being a Mid-size SLR camera.

Before getting through a detailed comparison, below is a brief highlight of how the E-M10 III scores versus the K-S1 in terms of portability, imaging, features and an overall score.

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Reasons to pick Olympus E-M10 III over the Pentax K-S1

 E-M10 III K-S1 
RevealedAugust 2017August 2014More modern by 37 months
Screen typeTiltingFixed Tilting screen
Screen resolution1040k921kCrisper screen (+119k dot)
Touch screen Quickly navigate

Reasons to pick Pentax K-S1 over the Olympus E-M10 III

 K-S1 E-M10 III 

Common features in the Olympus E-M10 III and Pentax K-S1

 E-M10 III K-S1 
Manually focus Very accurate focusing
Screen dimension3"3"Identical screen measurement
Selfie screen Lacking selfie screen

Olympus E-M10 III vs Pentax K-S1 Physical Comparison

In case you're looking to carry around your camera regularly, you're going to have to consider its weight and dimensions. The Olympus E-M10 III enjoys outer dimensions of 122mm x 84mm x 50mm (4.8" x 3.3" x 2.0") having a weight of 410 grams (0.90 lbs) while the Pentax K-S1 has dimensions of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") with a weight of 558 grams (1.23 lbs).

Analyze the Olympus E-M10 III vs Pentax K-S1 in the all new Camera and Lens Size Comparison Tool. Camera Size Comparison with Lenses

Always remember, the weight of an Interchangeable Lens Camera will differ dependant on the lens you have attached during that time. Following is the front view measurements comparison of the E-M10 III compared to the K-S1.

Olympus E-M10 III vs Pentax K-S1 size comparison

Using size and weight, the portability rating of the E-M10 III and K-S1 is 80 and 69 respectively.

Olympus E-M10 III vs Pentax K-S1 top view buttons comparison

Olympus E-M10 III vs Pentax K-S1 Sensor Comparison

In many cases, it is difficult to envision the difference in sensor sizes simply by going through specifications. The picture below will give you a clearer sense of the sensor dimensions in the E-M10 III and K-S1.

To sum up, the 2 cameras have got different megapixels and different sensor sizes. The E-M10 III because of its smaller sensor will make achieving shallower DOF more difficult and the Pentax K-S1 will produce more detail as a result of its extra 4 Megapixels. Higher resolution can also allow you to crop shots much more aggressively. The newer E-M10 III will have an advantage with regard to sensor innovation.

Olympus E-M10 III vs Pentax K-S1 sensor size comparison

Olympus E-M10 III vs Pentax K-S1 Screen and ViewFinder

Olympus E-M10 III vs Pentax K-S1 Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Olympus E-M10 III Portrait photography highlights
Pentax K-S1 Portrait photography highlights
73
you can focus manually
decent MP (16MP)
nice sensor size (Four Thirds)
comes with face detect autofocus
delivers RAW files
77
manual focus
sensor resolution is decent (20MP)
decent sensor size (APS-C)
provides face detection focus
delivers RAW files
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Street Comparison

Olympus E-M10 III Street photography factors
Pentax K-S1 Street photography factors
77
has a tilting screen
has image stabilization (Sensor based 5-axis)
nice sensor size (Four Thirds)
delivers RAW files
includes touch focus
very good ISO range (25,600)
more heavy than others (410 grams)
73
built in image stabilization (Sensor based)
decent sensor size (APS-C)
delivers RAW files
lighter than average (558 grams)
good high ISO (51,200)
screen does not articulate
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Sports Comparison

Olympus E-M10 III Sports photography details
Pentax K-S1 Sports photography details
69
silent shooting (1/16,000s)
has image stabilization (Sensor based 5-axis)
decent MP (16MP)
nice sensor size (Four Thirds)
comes with tracking focus
has no phase detect autofocus
69
high shutter speed (1/6,000s)
built in image stabilization (Sensor based)
sensor resolution is decent (20MP)
decent sensor size (APS-C)
provides tracking autofocus
supports phase detect auto focus
painfully slow continuous shooting (5.4 frames/s)
bad battery life (410 per charge)
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Travel Comparison

Olympus E-M10 III Travel photography factors
Pentax K-S1 Travel photography factors
67
includes touch focus
decent MP (16 megapixels)
flash built-in
more heavy than others (410g)
screen isn't selfie friendly
60
lighter than average (558g)
sensor resolution is decent (20 megapixels)
built-in flash
lack of Timelapse recording
bad battery life (410 CIPA)
does not have selfie friendly screen
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Landscape Comparison

Olympus E-M10 III Landscape photography info
Pentax K-S1 Landscape photography info
80
you can focus manually
change lenses (Micro Four Thirds mount)
decent sized screen (3 inches)
has image stabilization (Sensor based 5-axis)
decent MP (16 megapixels)
nice sensor size (Four Thirds)
very good ISO range (25,600)
delivers RAW files
73
manual focus
swap lenses (Pentax KAF2 mount)
decent sized screen (3")
built in image stabilization (Sensor based)
sensor resolution is decent (20 megapixels)
decent sensor size (APS-C)
does not have anti-alias filter
good high ISO (51,200)
delivers RAW files
bad battery life (410 CIPA)
lack of Timelapse recording
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Vlogging Comparison

Olympus E-M10 III as a Vlogging camera
Pentax K-S1 as a Vlogging camera
32
touchscreen enabled
has image stabilization (Sensor based 5-axis)
comes with face detect autofocus
high res video (3840 x 2160 pixels)
screen isn't selfie friendly
doesn't have microphone port
more heavy than others (410 grams)
33
built in image stabilization (Sensor based)
provides face detection focus
video resolution high (1920 x 1080 pxls)
lighter than average (558 grams)
does not have selfie friendly screen
lack of external microphone jack
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Olympus E-M10 III vs Pentax K-S1 Specifications

Detailed spec comparison table for Olympus E-M10 III and Pentax K-S1
 Olympus OM-D E-M10 Mark IIIPentax K-S1
General Information
Company Olympus Pentax
Model Olympus OM-D E-M10 Mark III Pentax K-S1
Category Entry-Level Mirrorless Advanced DSLR
Announced 2017-08-31 2014-08-27
Body design SLR-style mirrorless Mid-size SLR
Sensor Information
Powered by TruePic VIII Prime MII
Sensor type CMOS CMOS
Sensor size Four Thirds APS-C
Sensor measurements 17.4 x 13mm 23.5 x 15.6mm
Sensor area 226.2mm² 366.6mm²
Sensor resolution 16 megapixels 20 megapixels
Anti aliasing filter
Aspect ratio 4:3 3:2
Max resolution 4608 x 3456 5472 x 3648
Max native ISO 25600 51200
Minimum native ISO 200 100
RAW pictures
Minimum enhanced ISO 100 -
Autofocusing
Manual focus
Autofocus touch
Continuous autofocus
Autofocus single
Tracking autofocus
Selective autofocus
Autofocus center weighted
Autofocus multi area
Autofocus live view
Face detection focus
Contract detection focus
Phase detection focus
Number of focus points 121 11
Lens
Lens mounting type Micro Four Thirds Pentax KAF2
Number of lenses 107 151
Focal length multiplier 2.1 1.5
Screen
Screen type Tilting Fixed Type
Screen size 3 inches 3 inches
Resolution of screen 1,040 thousand dot 921 thousand dot
Selfie friendly
Liveview
Touch operation
Viewfinder Information
Viewfinder Electronic Optical (pentaprism)
Viewfinder resolution 2,360 thousand dot -
Viewfinder coverage 100% 100%
Viewfinder magnification 0.62x 0.64x
Features
Minimum shutter speed 60 seconds 30 seconds
Fastest shutter speed 1/4000 seconds 1/6000 seconds
Fastest silent shutter speed 1/16000 seconds -
Continuous shutter speed 8.6 frames per sec 5.4 frames per sec
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation Yes Yes
Set white balance
Image stabilization
Integrated flash
Flash range 5.80 m (at ISO 100) 10.00 m (at ISO 100)
Flash options Auto, redeye, slow sync, 2nd-curtain slow sync, redeye slow sync, fill-in, manual, off Auto, auto + redeye, on, on + redeye reduction, slow sync, trailing curtain sync, manual
External flash
AEB
White balance bracketing
Fastest flash sync 1/250 seconds -
Exposure
Multisegment metering
Average metering
Spot metering
Partial metering
AF area metering
Center weighted metering
Video features
Video resolutions 3840 x 2160 @ 30p / 102 Mbps, MOV, H.264, Linear PCM 1920 x 1080 (30,25,24 fps), 1280 x 720 (60,50 fps)
Max video resolution 3840x2160 1920x1080
Video format MPEG-4, H.264 H.264
Microphone input
Headphone input
Connectivity
Wireless Built-In Eye-Fi Connected
Bluetooth
NFC
HDMI
USB USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec)
GPS None Optional
Physical
Environmental seal
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 410 gr (0.90 lb) 558 gr (1.23 lb)
Dimensions 122 x 84 x 50mm (4.8" x 3.3" x 2.0") 121 x 93 x 70mm (4.8" x 3.7" x 2.8")
DXO scores
DXO Overall score not tested 78
DXO Color Depth score not tested 23.5
DXO Dynamic range score not tested 13.0
DXO Low light score not tested 1061
Other
Battery life 330 photographs 410 photographs
Battery format Battery Pack Battery Pack
Battery model BLS-50 D-LI109
Self timer Yes (2 or 12 secs, custom) Yes ( 2 or 12 seconds)
Time lapse recording
Type of storage SD/SDHC/SDXC (UHS-I/II supported) SD/SDHC/SDXC
Storage slots One One
Launch price $650 $339