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Olympus E-M1 III vs Pentax K-x

Portability
67
Imaging
62
Features
96
Overall
75
Olympus OM-D E-M1 Mark III front
 
Pentax K-x front
Portability
69
Imaging
52
Features
47
Overall
50

Olympus E-M1 III vs Pentax K-x 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 Maximum Shutter
  • 4096 x 2160 video
  • Micro Four Thirds Mount
  • 580g - 134 x 91 x 69mm
  • Launched February 2020
  • Old Model is Olympus E-M1 II
Pentax K-x
(Full Review)
  • 12MP - APS-C Sensor
  • 2.7" Fixed Screen
  • ISO 100 - 6400 (Bump to 12800)
  • Sensor based Image Stabilization
  • 1/6000s Max Shutter
  • 1280 x 720 video
  • Pentax KAF2 Mount
  • 580g - 123 x 92 x 68mm
  • Announced December 2009
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Olympus E-M1 III vs Pentax K-x Overview

Here, we will be evaluating the Olympus E-M1 III and Pentax K-x, one is a Pro Mirrorless and the latter is a Entry-Level DSLR by brands Olympus and Pentax. There is a big difference between the sensor resolutions of the E-M1 III (20MP) and K-x (12MP) and the E-M1 III (Four Thirds) and K-x (APS-C) boast different sensor sizes.

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The E-M1 III was launched 10 years after the K-x which is quite a big gap as far as tech is concerned. Each of these cameras feature different body design with the Olympus E-M1 III being a SLR-style mirrorless camera and the Pentax K-x being a Compact SLR camera.

Before diving into a in-depth comparison, here is a short view of how the E-M1 III grades vs the K-x in relation to portability, imaging, features and an overall score.

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

 E-M1 III K-x 
AnnouncedFebruary 2020December 2009More modern by 124 months
Screen typeFully ArticulatedFixed Fully Articulating screen
Screen size3"2.7"Bigger screen (+0.3")
Screen resolution1037k230kCrisper screen (+807k dot)
Selfie screen Take selfies
Touch friendly screen Quickly navigate

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

 K-x E-M1 III 

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

 E-M1 III K-x 
Manually focus Very accurate focusing

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

When you are planning to carry around your camera frequently, you're going to have to factor in its weight and measurements. The Olympus E-M1 III has got physical 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-x has proportions of 123mm x 92mm x 68mm (4.8" x 3.6" x 2.7") with a weight of 580 grams (1.28 lbs).

Compare the Olympus E-M1 III and Pentax K-x in the new Camera and Lens Size Comparison Tool. Camera Size Comparison with Lenses

Don't forget, the weight of an Interchangeable Lens Camera will change depending on the lens you are working with at that time. Underneath is a front view measurement comparison of the E-M1 III vs the K-x.

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

Considering size and weight, the portability score of the E-M1 III and K-x is 67 and 69 respectively.

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

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

Usually, it can be hard to picture the gap between sensor sizes merely by reading a spec sheet. The pic underneath may give you a greater sense of the sensor dimensions in the E-M1 III and K-x.

Clearly, both the cameras come with different megapixels and different sensor sizes. The E-M1 III because of its tinier sensor is going to make getting shallow depth of field more challenging and the Olympus E-M1 III will deliver more detail utilizing its extra 8MP. Higher resolution will also make it easier to crop pictures a good deal more aggressively. The more modern E-M1 III should have an edge with regard to sensor tech.

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

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

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

Portrait Comparison

Portrait photography with Olympus E-M1 III
Portrait photography with Pentax K-x
77
focusing manually
good megapixels (20MP)
decent sensor size (Four Thirds)
comes with face detect focus
supports RAW files
63
you can focus manually
decent sensor size (APS-C)
provides face detection focus
exports RAW files
low megapixels (12 megapixels)
Photography Glossary

Street Comparison

Olympus E-M1 III Street photography highlights
Pentax K-x Street photography highlights
78
fully articulated screen
has image stabilization (Sensor based 5-axis)
decent sensor size (Four Thirds)
supports RAW files
features touch to focus
environment sealing
above average ISO range (25,600)
67
has image stabilization (Sensor based)
decent sensor size (APS-C)
exports RAW files
screen is fixed
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Sports Comparison

Olympus E-M1 III Sports photography highlights
Pentax K-x Sports photography highlights
81
great max shutter speed (1/8,000s)
quiet mode (1/32,000s)
fast continuous shooting (60.0 fps)
has image stabilization (Sensor based 5-axis)
good megapixels (20 megapixels)
decent sensor size (Four Thirds)
comes with tracking focus
environment sealing
supports phase detect auto focus
61
high shutter speed (1/6,000 seconds)
has image stabilization (Sensor based)
decent sensor size (APS-C)
better than average battery power (1,900 per charge)
has phase detect auto focus
very slow continuous shooting (5.0 frames per second)
low megapixels (12MP)
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Travel Comparison

Olympus E-M1 III Travel photography details
Pentax K-x Travel photography details
79
environment sealing
connects via bluetooth
features touch to focus
good megapixels (20MP)
selfie friendly display
54
better than average battery power (1,900 CIPA)
flash built-in
lack of Time Lapse function
low megapixels (12MP)
doesn't posses selfie friendly screen
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Landscape Comparison

Olympus E-M1 III Landscape photography details
Pentax K-x Landscape photography details
81
focusing manually
interchangeable lenses (Micro Four Thirds mount)
good sized screen (3")
has image stabilization (Sensor based 5-axis)
good megapixels (20MP)
decent sensor size (Four Thirds)
no low pass filter
above average ISO range (25,600)
supports RAW files
environment sealing
two card slots
61
you can focus manually
change lenses (Pentax KAF2 mount)
has image stabilization (Sensor based)
decent sensor size (APS-C)
exports RAW files
better than average battery power (1,900 per charge)
screen is small (2.7 inches)
low megapixels (12 megapixels)
lack of Time Lapse function
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Vlogging Comparison

Olympus E-M1 III Vlogging info
Pentax K-x Vlogging info
79
selfie friendly display
has touchscreen
has image stabilization (Sensor based 5-axis)
comes with face detect focus
high quality video (4096 x 2160 pxls)
comes with mic socket
27
has image stabilization (Sensor based)
provides face detection focus
doesn't posses selfie friendly screen
low res video (1280 x 720 pixels)
lack of external mic support
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Olympus E-M1 III vs Pentax K-x Specifications

Detailed spec comparison table for Olympus E-M1 III and Pentax K-x
 Olympus OM-D E-M1 Mark IIIPentax K-x
General Information
Brand Name Olympus Pentax
Model Olympus OM-D E-M1 Mark III Pentax K-x
Type Pro Mirrorless Entry-Level DSLR
Launched 2020-02-11 2009-12-23
Physical type SLR-style mirrorless Compact SLR
Sensor Information
Chip TruePic IX Prime
Sensor type CMOS CMOS
Sensor size Four Thirds APS-C
Sensor dimensions 17.4 x 13mm 23.6 x 15.8mm
Sensor area 226.2mm² 372.9mm²
Sensor resolution 20 megapixel 12 megapixel
Anti aliasing filter
Aspect ratio 4:3 3:2
Full resolution 5184 x 3888 4288 x 2848
Max native ISO 25600 6400
Max boosted ISO - 12800
Lowest native ISO 200 100
RAW format
Lowest boosted ISO 64 -
Autofocusing
Manual focus
Touch focus
Continuous autofocus
Single autofocus
Tracking autofocus
Autofocus selectice
Autofocus center weighted
Autofocus multi area
Live view autofocus
Face detection focus
Contract detection focus
Phase detection focus
Number of focus points 121 11
Cross focus points 121 -
Lens
Lens mounting type Micro Four Thirds Pentax KAF2
Amount of lenses 107 151
Crop factor 2.1 1.5
Screen
Screen type Fully Articulated Fixed Type
Screen sizing 3" 2.7"
Screen resolution 1,037k dots 230k dots
Selfie friendly
Liveview
Touch functionality
Screen technology - TFT LCD monitor
Viewfinder Information
Viewfinder Electronic Optical (pentamirror)
Viewfinder resolution 2,360k dots -
Viewfinder coverage 100 percent 96 percent
Viewfinder magnification 0.74x 0.57x
Features
Lowest shutter speed 60 secs 30 secs
Highest shutter speed 1/8000 secs 1/6000 secs
Highest silent shutter speed 1/32000 secs -
Continuous shooting rate 60.0fps 5.0fps
Shutter priority
Aperture priority
Expose Manually
Exposure compensation Yes Yes
Change white balance
Image stabilization
Integrated flash
Flash range no built-in flash 16.00 m
Flash options Redeye, Fill-in, Flash Off, Red-eye Slow sync.(1st curtain), Slow sync.(1st curtain), Slow sync.(2nd curtain), Manual Auto, On, Off, Red-Eye, Slow Sync, Rear curtain, Wireless
External flash
AEB
WB bracketing
Highest flash synchronize 1/250 secs 1/180 secs
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
Video features
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 1280 x 720 (24 fps), 640 x 416 (24 fps)
Max video resolution 4096x2160 1280x720
Video data format MPEG-4, H.264 Motion JPEG
Mic support
Headphone support
Connectivity
Wireless Built-In None
Bluetooth
NFC
HDMI
USB USB 3.1 Gen 1 (5 GBit/sec) USB 2.0 (480 Mbit/sec)
GPS None None
Physical
Environment sealing
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 580 gr (1.28 pounds) 580 gr (1.28 pounds)
Physical dimensions 134 x 91 x 69mm (5.3" x 3.6" x 2.7") 123 x 92 x 68mm (4.8" x 3.6" x 2.7")
DXO scores
DXO All around score not tested 72
DXO Color Depth score not tested 22.8
DXO Dynamic range score not tested 12.5
DXO Low light score not tested 811
Other
Battery life 420 shots 1900 shots
Battery style Battery Pack Battery Pack
Battery model BLH-1 4 x AA
Self timer Yes (2 or 12 secs, custom) Yes (2 or 12 sec)
Time lapse recording
Type of storage Dual SD/SDHC/SDXC slots (UHS-II on first slot) SD/SDHC card
Card slots 2 One
Launch pricing $1,800 $600