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Olympus E-M10 III vs Pentax 645Z

Portability
80
Imaging
55
Features
75
Overall
63
Olympus OM-D E-M10 Mark III front
 
Pentax 645Z front
Portability
49
Imaging
80
Features
74
Overall
77

Olympus E-M10 III vs Pentax 645Z 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
  • Previous Model is Olympus E-M10 II
  • Later Model is Olympus E-M10 IV
Pentax 645Z
(Full Review)
  • 51MP - Medium format Sensor
  • 3.2" Tilting Display
  • ISO 100 - 204800
  • No Anti-Alias Filter
  • 1920 x 1080 video
  • Pentax 645AF2 Mount
  • 1550g - 156 x 117 x 123mm
  • Released April 2014
  • Succeeded the Pentax 645D
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Olympus E-M10 III vs Pentax 645Z Overview

Below is a comprehensive overview of the Olympus E-M10 III vs Pentax 645Z, former being a Entry-Level Mirrorless while the other is a Pro DSLR by manufacturers Olympus and Pentax. There is a considerable difference between the resolutions of the E-M10 III (16MP) and 645Z (51MP) and the E-M10 III (Four Thirds) and 645Z (Medium format) provide different sensor size.

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The E-M10 III was introduced 3 years later than the 645Z and that is quite a large difference as far as tech is concerned. Both of the cameras have different body design with the Olympus E-M10 III being a SLR-style mirrorless camera and the Pentax 645Z being a Large SLR camera.

Before delving into a complete comparison, here is a brief summation of how the E-M10 III scores versus the 645Z in regards to portability, imaging, features and an overall grade.

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

 E-M10 III 645Z 
ReleasedAugust 2017April 2014More recent by 42 months
Display resolution1040k1037kClearer display (+3k dot)
Touch friendly display Easily navigate

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

 645Z E-M10 III 
Display dimensions3.2"3"Larger display (+0.2")

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

 E-M10 III 645Z 
Manual focus Dial exact focus
Display typeTiltingTiltingTilting display
Selfie screen No selfie screen

Olympus E-M10 III vs Pentax 645Z Physical Comparison

For anyone who is intending to lug around your camera regularly, you will need to factor in its weight and size. The Olympus E-M10 III offers physical dimensions of 122mm x 84mm x 50mm (4.8" x 3.3" x 2.0") having a weight of 410 grams (0.90 lbs) and the Pentax 645Z has specifications of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") having a weight of 1550 grams (3.42 lbs).

Compare the Olympus E-M10 III vs Pentax 645Z in our newest Camera & Lens Size Comparison Tool. Camera Size Comparison with Lenses

Take into consideration, the weight of an ILC will differ based on the lens you have chosen at that time. Here is a front view measurements comparison of the E-M10 III compared to the 645Z.

Olympus E-M10 III vs Pentax 645Z size comparison

Looking at size and weight, the portability rating of the E-M10 III and 645Z is 80 and 49 respectively.

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

Olympus E-M10 III vs Pentax 645Z Sensor Comparison

Generally, it's hard to picture the gap between sensor measurements just by reviewing specs. The graphic here will offer you a stronger sense of the sensor sizes in the E-M10 III and 645Z.

As you can plainly see, both of these cameras have different megapixels and different sensor measurements. The E-M10 III having a tinier sensor is going to make shooting shallow DOF tougher and the Pentax 645Z will offer extra detail using its extra 35MP. Greater resolution can also help you crop photos a bit more aggressively. The more modern E-M10 III provides an edge in sensor tech.

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

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

Olympus E-M10 III vs Pentax 645Z Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Olympus E-M10 III as a Portrait photography camera
Pentax 645Z as a Portrait photography camera
73
manual focus
resolution is good (16MP)
sensor size is good (Four Thirds)
features face detection autofocus
exports RAW files
88
focusing manually
megapixel count high (51 megapixels)
great sensor size (Medium format)
offers face detect focusing
exports RAW files
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Street Comparison

Street photography with Olympus E-M10 III
Street photography with Pentax 645Z
77
screen tilts up and down
has image stabilization (Sensor based 5-axis)
sensor size is good (Four Thirds)
exports RAW files
offers touch to focus
great ISO range (25,600)
more heavy than others in class (410g)
63
screen tilts
great sensor size (Medium format)
exports RAW files
weather proof
great high ISO (204,800)
lack of image stabilization
more heavy than competition in class (1,550g)
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Sports Comparison

Olympus E-M10 III Sports photography information
Pentax 645Z Sports photography information
69
quiet shooting (1/16,000s)
has image stabilization (Sensor based 5-axis)
resolution is good (16 megapixels)
sensor size is good (Four Thirds)
features tracking autofocus
has no phase detect autofocus
71
megapixel count high (51MP)
great sensor size (Medium format)
offers tracking focus
weather proof
supports phase detect AF
slow continuous shooting (3.0 fps)
lack of image stabilization
low battery power (650 shots)
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Travel Comparison

Olympus E-M10 III as a Travel photography camera
Pentax 645Z as a Travel photography camera
67
offers touch to focus
resolution is good (16 megapixels)
built-in flash
more heavy than others in class (410 grams)
doesn't posses selfie friendly display
51
weather proof
megapixel count high (51 megapixels)
low battery power (650 shots)
more heavy than competition in class (1,550 grams)
doesn't offer selfie friendly screen
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Landscape Comparison

Landscape photography with Olympus E-M10 III
Landscape photography with Pentax 645Z
80
manual focus
switch lenses (Micro Four Thirds mount)
pretty good screen size (3 inches)
has image stabilization (Sensor based 5-axis)
resolution is good (16MP)
sensor size is good (Four Thirds)
great ISO range (25,600)
exports RAW files
78
focusing manually
swap lenses (Pentax 645AF2 mount)
screen is a decent size (3.2")
megapixel count high (51 megapixels)
great sensor size (Medium format)
does not have anti aliasing filter
great high ISO (204,800)
exports RAW files
weather proof
2 card slots
lack of image stabilization
low battery power (650 CIPA)
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Vlogging Comparison

Vlogging with Olympus E-M10 III
Vlogging with Pentax 645Z
32
touchscreen enabled
has image stabilization (Sensor based 5-axis)
features face detection autofocus
video resolution high (3840 x 2160 resolution)
doesn't posses selfie friendly display
missing external microphone support
more heavy than others in class (410g)
27
offers face detect focusing
great video quality (1920 x 1080 pixels)
comes with microphone support
doesn't offer selfie friendly screen
lack of image stabilization
more heavy than competition in class (1,550g)
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Olympus E-M10 III vs Pentax 645Z Specifications

Detailed spec comparison table for Olympus E-M10 III and Pentax 645Z
 Olympus OM-D E-M10 Mark IIIPentax 645Z
General Information
Brand Name Olympus Pentax
Model Olympus OM-D E-M10 Mark III Pentax 645Z
Class Entry-Level Mirrorless Pro DSLR
Released 2017-08-31 2014-04-15
Physical type SLR-style mirrorless Large SLR
Sensor Information
Processor TruePic VIII PRIME III
Sensor type CMOS CMOS
Sensor size Four Thirds Medium format
Sensor measurements 17.4 x 13mm 44 x 33mm
Sensor area 226.2mm² 1,452.0mm²
Sensor resolution 16 megapixels 51 megapixels
Anti aliasing filter
Aspect ratio 4:3 4:3
Maximum resolution 4608 x 3456 8256 x 6192
Maximum native ISO 25600 204800
Minimum native ISO 200 100
RAW images
Minimum boosted ISO 100 -
Autofocusing
Manual focus
AF touch
Continuous AF
Single AF
Tracking AF
Selective AF
AF center weighted
AF multi area
AF live view
Face detection AF
Contract detection AF
Phase detection AF
Number of focus points 121 27
Lens
Lens mount Micro Four Thirds Pentax 645AF2
Available lenses 107 6
Crop factor 2.1 0.8
Screen
Type of screen Tilting Tilting
Screen sizing 3" 3.2"
Screen resolution 1,040 thousand dots 1,037 thousand dots
Selfie friendly
Liveview
Touch function
Viewfinder Information
Viewfinder type Electronic Optical (pentaprism)
Viewfinder resolution 2,360 thousand dots -
Viewfinder coverage 100% 98%
Viewfinder magnification 0.62x 0.85x
Features
Lowest shutter speed 60 secs 30 secs
Highest shutter speed 1/4000 secs 1/4000 secs
Highest silent shutter speed 1/16000 secs -
Continuous shooting rate 8.6 frames per sec 3.0 frames per sec
Shutter priority
Aperture priority
Manual mode
Exposure compensation Yes Yes
Set WB
Image stabilization
Integrated flash
Flash range 5.80 m (at ISO 100) no built-in flash
Flash settings Auto, redeye, slow sync, 2nd-curtain slow sync, redeye slow sync, fill-in, manual, off Flash On, Flash On+Red-eye Reduction, Slow-speed Sync, Slow-speed Sync+Red-eye, P-TTL, Trailing Curtain Sync, contrast-control-sync, high-speed sync, wireless sync
Hot shoe
AEB
White balance bracketing
Highest flash synchronize 1/250 secs 1/125 secs
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 (60i, 50i, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p,24p)
Maximum video resolution 3840x2160 1920x1080
Video format MPEG-4, H.264 MPEG-4, H.264
Microphone support
Headphone support
Connectivity
Wireless Built-In None
Bluetooth
NFC
HDMI
USB USB 2.0 (480 Mbit/sec) USB 3.0 (5 GBit/sec)
GPS None Optional
Physical
Environment sealing
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 410 gr (0.90 lb) 1550 gr (3.42 lb)
Physical dimensions 122 x 84 x 50mm (4.8" x 3.3" x 2.0") 156 x 117 x 123mm (6.1" x 4.6" x 4.8")
DXO scores
DXO All around score not tested 101
DXO Color Depth score not tested 26.0
DXO Dynamic range score not tested 14.7
DXO Low light score not tested 4505
Other
Battery life 330 pictures 650 pictures
Battery style Battery Pack Battery Pack
Battery model BLS-50 D-LI90
Self timer Yes (2 or 12 secs, custom) Yes (2 or 10 secs)
Time lapse feature
Type of storage SD/SDHC/SDXC (UHS-I/II supported) Dual SD/SDHC/SDXC slots
Card slots Single Dual
Launch price $650 $5,024