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Olympus E-M10 III vs Pentax 645D

Portability
80
Imaging
55
Features
75
Overall
63
Olympus OM-D E-M10 Mark III front
 
Pentax 645D front
Portability
50
Imaging
76
Features
52
Overall
66

Olympus E-M10 III vs Pentax 645D 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
  • Released August 2017
  • Succeeded the Olympus E-M10 II
  • Later Model is Olympus E-M10 IV
Pentax 645D
(Full Review)
  • 40MP - Medium format Sensor
  • 3" Fixed Display
  • ISO 200 - 1600
  • No Anti-Alias Filter
  • No Video
  • Pentax 645AF2 Mount
  • 1480g - 156 x 117 x 119mm
  • Introduced March 2010
  • Successor is Pentax 645Z
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Olympus E-M10 III vs Pentax 645D Overview

On this page, we are evaluating the Olympus E-M10 III and Pentax 645D, one being a Entry-Level Mirrorless and the other is a Pro DSLR by manufacturers Olympus and Pentax. There exists a significant gap among the image resolutions of the E-M10 III (16MP) and 645D (40MP) and the E-M10 III (Four Thirds) and 645D (Medium format) have different sensor sizes.

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The E-M10 III was unveiled 7 years later than the 645D and that is a fairly sizable gap as far as camera technology is concerned. Both the cameras have different body design with the Olympus E-M10 III being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before delving into a full comparison, here is a simple introduction of how the E-M10 III scores versus the 645D in relation to portability, imaging, features and an overall rating.

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Reasons to pick Olympus E-M10 III over the Pentax 645D

 E-M10 III 645D 
IntroducedAugust 2017March 2010Fresher by 92 months
Display typeTiltingFixed Tilting display
Display resolution1040k921kSharper display (+119k dot)
Touch display Easily navigate

Reasons to pick Pentax 645D over the Olympus E-M10 III

 645D E-M10 III 

Common features in the Olympus E-M10 III and Pentax 645D

 E-M10 III 645D 
Manually focus More exact focus
Display dimensions3"3"Equal display dimensions
Selfie screen No selfie screen

Olympus E-M10 III vs Pentax 645D Physical Comparison

For those who are going to carry your camera regularly, you'll need to think about its weight and volume. The Olympus E-M10 III enjoys outside measurements of 122mm x 84mm x 50mm (4.8" x 3.3" x 2.0") accompanied by a weight of 410 grams (0.90 lbs) whilst the Pentax 645D has sizing of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") accompanied by a weight of 1480 grams (3.26 lbs).

Check out the Olympus E-M10 III and Pentax 645D 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 dependant on the lens you have attached during that time. Below is a front view measurements comparison of the E-M10 III compared to the 645D.

Olympus E-M10 III vs Pentax 645D size comparison

Using dimensions and weight, the portability rating of the E-M10 III and 645D is 80 and 50 respectively.

Olympus E-M10 III vs Pentax 645D top view buttons comparison

Olympus E-M10 III vs Pentax 645D Sensor Comparison

Normally, its difficult to imagine the gap in sensor sizing purely by looking through technical specs. The photograph here may offer you a greater sense of the sensor measurements in the E-M10 III and 645D.

As you can tell, the 2 cameras have different resolutions and different sensor sizing. The E-M10 III with its smaller sensor is going to make achieving bokeh more challenging and the Pentax 645D will provide you with more detail having an extra 24 Megapixels. Greater resolution will help you crop pics a bit more aggressively. The newer E-M10 III should have a benefit with regard to sensor technology.

Olympus E-M10 III vs Pentax 645D sensor size comparison

Olympus E-M10 III vs Pentax 645D Screen and ViewFinder

Olympus E-M10 III vs Pentax 645D Screen and Viewfinder comparison
Photography Glossary

Photography Type Scores

Portrait Comparison

Portrait photography with Olympus E-M10 III
Portrait photography with Pentax 645D
73
you can focus manually
sensor resolution is decent (16 megapixels)
nice sensor size (Four Thirds)
supports face detect focus
delivers RAW formats
77
has manual focus
high megapixels (40MP)
sensor size is large (Medium format)
saves RAW files
does not have liveview
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Street Comparison

Olympus E-M10 III Street photography info
Pentax 645D Street photography info
77
tilting screen
built in image stabilization (Sensor based 5-axis)
nice sensor size (Four Thirds)
delivers RAW formats
boasts focus by touch
very good high ISO (25,600)
heavier than competitors (410 grams)
58
sensor size is large (Medium format)
saves RAW files
weather proofing
screen is fixed
no image stabilization
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Sports Comparison

Olympus E-M10 III Sports photography info
Pentax 645D Sports photography info
69
silent shooting (1/16,000s)
built in image stabilization (Sensor based 5-axis)
sensor resolution is decent (16 megapixels)
nice sensor size (Four Thirds)
supports tracking focus
has no phase detect auto focus
63
high megapixels (40 megapixels)
sensor size is large (Medium format)
weather proofing
has phase detect AF
does not have liveview
slow fps (1.0 fps)
no image stabilization
bad battery (800 shots)
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Travel Comparison

Olympus E-M10 III Travel photography details
Pentax 645D Travel photography details
67
boasts focus by touch
sensor resolution is decent (16 megapixels)
has built in flash
heavier than competitors (410 grams)
does not feature selfie friendly screen
55
weather proofing
high megapixels (40MP)
bad battery (800 CIPA)
doesn't posses selfie friendly screen
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Landscape Comparison

Olympus E-M10 III Landscape photography info
Pentax 645D Landscape photography info
80
you can focus manually
swap lenses (Micro Four Thirds mount)
screen size is good (3")
built in image stabilization (Sensor based 5-axis)
sensor resolution is decent (16 megapixels)
nice sensor size (Four Thirds)
very good high ISO (25,600)
delivers RAW formats
72
has manual focus
swap lenses (Pentax 645AF2 mount)
pretty good screen size (3 inch)
high megapixels (40 megapixels)
sensor size is large (Medium format)
no anti-alias filter
saves RAW files
weather proofing
two card slots
does not have liveview
no image stabilization
bad battery (800 CIPA)
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Vlogging Comparison

Olympus E-M10 III Vlogging details
Pentax 645D Vlogging details
32
touch screen
built in image stabilization (Sensor based 5-axis)
supports face detect focus
video res high (3840 x 2160 pxls)
does not feature selfie friendly screen
missing mic port
heavier than competitors (410 grams)
9
can't record video
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Olympus E-M10 III vs Pentax 645D Specifications

Detailed spec comparison table for Olympus E-M10 III and Pentax 645D
 Olympus OM-D E-M10 Mark IIIPentax 645D
General Information
Manufacturer Olympus Pentax
Model Olympus OM-D E-M10 Mark III Pentax 645D
Class Entry-Level Mirrorless Pro DSLR
Released 2017-08-31 2010-03-10
Physical type SLR-style mirrorless Large SLR
Sensor Information
Powered by TruePic VIII Prime II
Sensor type CMOS CCD
Sensor size Four Thirds Medium format
Sensor dimensions 17.4 x 13mm 44 x 33mm
Sensor area 226.2mm² 1,452.0mm²
Sensor resolution 16 megapixels 40 megapixels
Anti aliasing filter
Aspect ratio 4:3 4:3
Maximum resolution 4608 x 3456 7264 x 5440
Maximum native ISO 25600 1600
Minimum native ISO 200 200
RAW data
Minimum boosted ISO 100 100
Autofocusing
Manual focus
Touch focus
Autofocus continuous
Autofocus single
Tracking autofocus
Autofocus selectice
Center weighted autofocus
Multi area autofocus
Live view autofocus
Face detection focus
Contract detection focus
Phase detection focus
Number of focus points 121 11
Lens
Lens mounting type Micro Four Thirds Pentax 645AF2
Number of lenses 107 6
Crop factor 2.1 0.8
Screen
Screen type Tilting Fixed Type
Screen sizing 3 inches 3 inches
Resolution of screen 1,040k dots 921k dots
Selfie friendly
Liveview
Touch function
Screen technology - TFT Color LCD with wide-viewing angle and with AR coating
Viewfinder Information
Viewfinder Electronic Optical (pentaprism)
Viewfinder resolution 2,360k dots -
Viewfinder coverage 100 percent 98 percent
Viewfinder magnification 0.62x 0.85x
Features
Slowest shutter speed 60s 30s
Maximum shutter speed 1/4000s 1/4000s
Maximum silent shutter speed 1/16000s -
Continuous shooting rate 8.6fps 1.0fps
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation Yes Yes
Custom white balance
Image stabilization
Integrated flash
Flash range 5.80 m (at ISO 100) no built-in flash
Flash modes Auto, redeye, slow sync, 2nd-curtain slow sync, redeye slow sync, fill-in, manual, off Auto, On, Off, Red-eye, Slow Sync, Rear Curtain
External flash
Auto exposure bracketing
White balance bracketing
Maximum flash synchronize 1/250s 1/125s
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 -
Maximum video resolution 3840x2160 None
Video format MPEG-4, H.264 -
Mic port
Headphone port
Connectivity
Wireless Built-In None
Bluetooth
NFC
HDMI
USB USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec)
GPS None None
Physical
Environment sealing
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 410 grams (0.90 lb) 1480 grams (3.26 lb)
Physical dimensions 122 x 84 x 50mm (4.8" x 3.3" x 2.0") 156 x 117 x 119mm (6.1" x 4.6" x 4.7")
DXO scores
DXO All around score not tested 82
DXO Color Depth score not tested 24.6
DXO Dynamic range score not tested 12.6
DXO Low light score not tested 1262
Other
Battery life 330 photographs 800 photographs
Type of battery Battery Pack Battery Pack
Battery model BLS-50 D-LI90
Self timer Yes (2 or 12 secs, custom) Yes (2 or 10 sec)
Time lapse feature
Type of storage SD/SDHC/SDXC (UHS-I/II supported) SD/SDHC
Card slots One 2
Launch pricing $650 $4,000