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Olympus E-M1 III vs Pentax K100D

Portability
67
Imaging
62
Features
96
Overall
75
Olympus OM-D E-M1 Mark III front
 
Pentax K100D front
Portability
64
Imaging
45
Features
36
Overall
41

Olympus E-M1 III vs Pentax K100D Key Specs

Olympus E-M1 III
(Full Review)
  • 20MP - Four Thirds Sensor
  • 3" Fully Articulated Display
  • 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
  • Released February 2020
  • Older Model is Olympus E-M1 II
Pentax K100D
(Full Review)
  • 6MP - APS-C Sensor
  • 2.5" Fixed Screen
  • ISO 200 - 3200
  • Sensor based Image Stabilization
  • No Video
  • Pentax KAF Mount
  • 660g - 129 x 93 x 70mm
  • Announced December 2006
  • Updated by Pentax K100D S
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Olympus E-M1 III vs Pentax K100D Overview

Following is a detailed analysis of the Olympus E-M1 III versus Pentax K100D, one is a Pro Mirrorless and the latter is a Entry-Level DSLR by companies Olympus and Pentax. There exists a crucial gap between the resolutions of the E-M1 III (20MP) and K100D (6MP) and the E-M1 III (Four Thirds) and K100D (APS-C) feature different sensor dimensions.

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The E-M1 III was released 13 years after the K100D which is quite a serious gap as far as technology is concerned. Both cameras come with different body type with the Olympus E-M1 III being a SLR-style mirrorless camera and the Pentax K100D being a Compact SLR camera.

Before going straight into a in-depth comparison, below is a short overview of how the E-M1 III scores vs the K100D in regards to portability, imaging, features and an overall score.

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Reasons to pick Olympus E-M1 III over the Pentax K100D

 E-M1 III K100D 
AnnouncedFebruary 2020December 2006More modern by 161 months
Screen typeFully ArticulatedFixed Fully Articulating screen
Screen dimension3"2.5"Bigger screen (+0.5")
Screen resolution1037k210kClearer screen (+827k dot)
Selfie screen Easy selfies
Touch screen Quickly navigate

Reasons to pick Pentax K100D over the Olympus E-M1 III

 K100D E-M1 III 

Common features in the Olympus E-M1 III and Pentax K100D

 E-M1 III K100D 
Manual focus Very exact focusing

Olympus E-M1 III vs Pentax K100D Physical Comparison

For those who are aiming to carry around your camera frequently, you're going to have to factor its weight and dimensions. The Olympus E-M1 III features external dimensions of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") with a weight of 580 grams (1.28 lbs) whilst the Pentax K100D has dimensions of 129mm x 93mm x 70mm (5.1" x 3.7" x 2.8") with a weight of 660 grams (1.46 lbs).

Compare the Olympus E-M1 III versus Pentax K100D in the new Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses

Always remember, the weight of an Interchangeable Lens Camera will differ based on the lens you are utilizing at that time. Underneath is the front view measurements comparison of the E-M1 III compared to the K100D.

Olympus E-M1 III vs Pentax K100D size comparison

Taking into account dimensions and weight, the portability score of the E-M1 III and K100D is 67 and 64 respectively.

Olympus E-M1 III vs Pentax K100D top view buttons comparison

Olympus E-M1 III vs Pentax K100D Sensor Comparison

Typically, it's hard to imagine the contrast between sensor sizes only by going over specifications. The pic underneath may provide you a more clear sense of the sensor dimensions in the E-M1 III and K100D.

Plainly, both of those cameras have got different megapixels and different sensor sizes. The E-M1 III due to its tinier sensor is going to make shooting shallower DOF more challenging and the Olympus E-M1 III will deliver extra detail as a result of its extra 14 Megapixels. Higher resolution can also enable you to crop photographs much more aggressively. The fresher E-M1 III provides a benefit with regard to sensor innovation.

Olympus E-M1 III vs Pentax K100D sensor size comparison

Olympus E-M1 III vs Pentax K100D Screen and ViewFinder

Olympus E-M1 III vs Pentax K100D Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Portrait photography with Olympus E-M1 III
Portrait photography with Pentax K100D
77
has manual focus
megapixel count good (20 megapixels)
sensor size is nice (Four Thirds)
comes with face detect focus
saves RAW files
51
focusing manually
good sensor size (APS-C)
exports RAW formats
doesn't have liveview
megapixel count low (6 megapixels)
Photography Glossary

Street Comparison

Olympus E-M1 III Street photography factors
Pentax K100D Street photography factors
78
screen articulates fully
image stabilization (Sensor based 5-axis)
sensor size is nice (Four Thirds)
saves RAW files
boasts touch to focus
weather proofing
good ISO range (25,600)
58
built in image stabilization (Sensor based)
good sensor size (APS-C)
exports RAW formats
screen is fixed
more heavy than competition in class (660 grams)
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Sports Comparison

Olympus E-M1 III as a Sports photography camera
Pentax K100D as a Sports photography camera
81
max shutter speed is good (1/8,000s)
quiet mode (1/32,000s)
fast shooting (60.0 fps)
image stabilization (Sensor based 5-axis)
megapixel count good (20MP)
sensor size is nice (Four Thirds)
comes with tracking focus
weather proofing
sensor has phase detect auto focus
47
built in image stabilization (Sensor based)
good sensor size (APS-C)
comes with phase detect autofocus
doesn't have liveview
painfully slow continuous shooting (3.0 fps)
megapixel count low (6 megapixels)
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Travel Comparison

Olympus E-M1 III Travel photography information
Pentax K100D Travel photography information
79
weather proofing
connects via bluetooth
boasts touch to focus
megapixel count good (20 megapixels)
selfie friendly display
42
flash built-in
does not have Timelapse function
more heavy than competition in class (660 grams)
megapixel count low (6 megapixels)
doesn't contain selfie friendly display
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Landscape Comparison

Olympus E-M1 III Landscape photography highlights
Pentax K100D Landscape photography highlights
81
has manual focus
switch lenses (Micro Four Thirds mount)
pretty good screen size (3 inch)
image stabilization (Sensor based 5-axis)
megapixel count good (20 megapixels)
sensor size is nice (Four Thirds)
doesnt have anti aliasing filter
good ISO range (25,600)
saves RAW files
weather proofing
has dual storage slots
52
focusing manually
interchangeable lenses (Pentax KAF mount)
built in image stabilization (Sensor based)
good sensor size (APS-C)
exports RAW formats
screen is somewhat small (2.5 inches)
doesn't have liveview
megapixel count low (6 megapixels)
does not have Timelapse function
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Vlogging Comparison

Olympus E-M1 III Vlogging information
Pentax K100D Vlogging information
79
selfie friendly display
built-in touchscreen
image stabilization (Sensor based 5-axis)
comes with face detect focus
video resolution high (4096 x 2160 pxls)
includes mic jack
9
can't shoot video
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Olympus E-M1 III vs Pentax K100D Specifications

Detailed spec comparison table for Olympus E-M1 III and Pentax K100D
 Olympus OM-D E-M1 Mark IIIPentax K100D
General Information
Brand Name Olympus Pentax
Model type Olympus OM-D E-M1 Mark III Pentax K100D
Type Pro Mirrorless Entry-Level DSLR
Released 2020-02-11 2006-12-03
Body design SLR-style mirrorless Compact SLR
Sensor Information
Processor Chip TruePic IX -
Sensor type CMOS CCD
Sensor size Four Thirds APS-C
Sensor measurements 17.4 x 13mm 23.5 x 15.7mm
Sensor area 226.2mm² 369.0mm²
Sensor resolution 20 megapixel 6 megapixel
Anti alias filter
Aspect ratio 4:3 3:2
Full resolution 5184 x 3888 3008 x 2008
Max native ISO 25600 3200
Minimum native ISO 200 200
RAW data
Minimum boosted ISO 64 -
Autofocusing
Focus manually
Touch to focus
Continuous autofocus
Single autofocus
Tracking autofocus
Selective autofocus
Center weighted autofocus
Autofocus multi area
Autofocus live view
Face detect autofocus
Contract detect autofocus
Phase detect autofocus
Total focus points 121 11
Cross type focus points 121 -
Lens
Lens support Micro Four Thirds Pentax KAF
Total lenses 107 151
Focal length multiplier 2.1 1.5
Screen
Range of display Fully Articulated Fixed Type
Display sizing 3 inches 2.5 inches
Display resolution 1,037 thousand dot 210 thousand dot
Selfie friendly
Liveview
Touch screen
Viewfinder Information
Viewfinder type Electronic Optical (pentamirror)
Viewfinder resolution 2,360 thousand dot -
Viewfinder coverage 100% 96%
Viewfinder magnification 0.74x 0.57x
Features
Lowest shutter speed 60 seconds 30 seconds
Highest shutter speed 1/8000 seconds 1/4000 seconds
Highest quiet shutter speed 1/32000 seconds -
Continuous shooting speed 60.0 frames per second 3.0 frames per second
Shutter priority
Aperture priority
Manual exposure
Exposure compensation Yes Yes
Change white balance
Image stabilization
Integrated flash
Flash distance no built-in flash -
Flash settings 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 reduction
External flash
AE bracketing
WB bracketing
Highest flash sync 1/250 seconds 1/180 seconds
Exposure
Multisegment
Average
Spot
Partial
AF area
Center weighted
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 -
Max video resolution 4096x2160 None
Video data format MPEG-4, H.264 -
Microphone input
Headphone input
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
Environmental seal
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 580g (1.28 lbs) 660g (1.46 lbs)
Dimensions 134 x 91 x 69mm (5.3" x 3.6" x 2.7") 129 x 93 x 70mm (5.1" x 3.7" x 2.8")
DXO scores
DXO All around 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 images -
Type of battery Battery Pack -
Battery ID BLH-1 4 x AA
Self timer Yes (2 or 12 secs, custom) Yes (2 or 12 sec)
Time lapse feature
Type of storage Dual SD/SDHC/SDXC slots (UHS-II on first slot) SD/MMC card
Storage slots Dual 1
Retail price $1,800 $0