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Olympus E-M10 IV vs Pentax 645Z

Portability
81
Imaging
62
Features
83
Overall
70
Olympus OM-D E-M10 IV front
 
Pentax 645Z front
Portability
49
Imaging
80
Features
74
Overall
77

Olympus E-M10 IV vs Pentax 645Z Key Specs

Olympus E-M10 IV
(Full Review)
  • 20MP - Four Thirds Sensor
  • 3" Tilting Display
  • ISO 200 - 25600
  • Sensor based 5-axis Image Stabilization
  • 3840 x 2160 video
  • Micro Four Thirds Mount
  • 383g - 122 x 84 x 49mm
  • Revealed August 2020
  • Superseded the Olympus E-M10 III
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
  • Announced April 2014
  • Older Model is Pentax 645D
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Olympus E-M10 IV vs Pentax 645Z Overview

Here is a thorough overview of the Olympus E-M10 IV versus Pentax 645Z, 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 resolutions of the E-M10 IV (20MP) and 645Z (51MP) and the E-M10 IV (Four Thirds) and 645Z (Medium format) enjoy totally different sensor sizes.

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The E-M10 IV was brought out 6 years later than the 645Z and that is a fairly sizable gap as far as camera technology is concerned. Each of the cameras offer different body type with the Olympus E-M10 IV being a SLR-style mirrorless camera and the Pentax 645Z being a Large SLR camera.

Before diving straight into a comprehensive comparison, below is a simple overview of how the E-M10 IV matches up versus the 645Z in relation to portability, imaging, features and an overall rating.

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

 E-M10 IV 645Z 
AnnouncedAugust 2020April 2014Fresher by 77 months
Display resolution1040k1037kCrisper display (+3k dot)
Selfie screen Easy selfies
Touch display Easily navigate

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

 645Z E-M10 IV 
Display sizing3.2"3"Larger display (+0.2")

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

 E-M10 IV 645Z 
Focus manually Very precise focusing
Display typeTiltingTiltingTilting display

Olympus E-M10 IV vs Pentax 645Z Physical Comparison

In case you're going to carry your camera often, you're going to have to factor in its weight and volume. The Olympus E-M10 IV has physical dimensions of 122mm x 84mm x 49mm (4.8" x 3.3" x 1.9") and a weight of 383 grams (0.84 lbs) while the Pentax 645Z has sizing of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") along with a weight of 1550 grams (3.42 lbs).

Contrast the Olympus E-M10 IV versus Pentax 645Z in the latest Camera and Lens Size Comparison Tool. Camera Size Comparison with Lenses

Don't forget, the weight of an Interchangeable Lens Camera will vary depending on the lens you are employing during that time. The following is the front view measurements comparison of the E-M10 IV vs the 645Z.

Olympus E-M10 IV vs Pentax 645Z size comparison

Taking into account dimensions and weight, the portability score of the E-M10 IV and 645Z is 81 and 49 respectively.

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

Olympus E-M10 IV vs Pentax 645Z Sensor Comparison

Sometimes, it is tough to see the contrast in sensor sizing purely by checking out technical specs. The visual below should offer you a clearer sense of the sensor sizes in the E-M10 IV and 645Z.

As you have seen, both of these cameras offer different megapixel count and different sensor sizing. The E-M10 IV due to its smaller sensor will make achieving bokeh tougher and the Pentax 645Z will show extra detail having its extra 31MP. Greater resolution will enable you to crop images a little more aggressively. The fresher E-M10 IV is going to have a benefit in sensor tech.

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

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

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

Portrait Comparison

Olympus E-M10 IV Portrait photography information
Pentax 645Z Portrait photography information
77
focusing manually
MP count good (20MP)
nice sensor size (Four Thirds)
offers face detect focus
saves RAW files
88
you can focus manually
fantastic megapixels (51 megapixels)
great sensor size (Medium format)
provides face detection focusing
exports RAW files
Photography Glossary

Street Comparison

Olympus E-M10 IV Street photography factors
Pentax 645Z Street photography factors
84
screen tilts up and down
has image stabilization (Sensor based 5-axis)
nice sensor size (Four Thirds)
saves RAW files
includes touch to focus
great ISO range (25,600)
63
tilting screen
great sensor size (Medium format)
exports RAW files
weather sealing
great ISO range (204,800)
lack of image stabilization
more heavy than competitors in class (1,550 grams)
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Sports Comparison

Olympus E-M10 IV Sports photography details
Pentax 645Z Sports photography details
72
quiet mode (1/16,000 seconds)
has image stabilization (Sensor based 5-axis)
MP count good (20 megapixels)
nice sensor size (Four Thirds)
offers tracking focus
lacks phase detect auto focus
71
fantastic megapixels (51 megapixels)
great sensor size (Medium format)
provides tracking autofocus
weather sealing
comes with phase detect AF
very slow continuous shooting (3.0 frames/s)
lack of image stabilization
terrible battery power (650 CIPA)
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Travel Comparison

Olympus E-M10 IV Travel photography advice
Pentax 645Z Travel photography advice
84
connects via bluetooth
includes touch to focus
MP count good (20MP)
built-in flash
screen is selfie friendly
51
weather sealing
fantastic megapixels (51 megapixels)
terrible battery power (650 shots)
more heavy than competitors in class (1,550 grams)
doesn't offer selfie friendly display
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Landscape Comparison

Olympus E-M10 IV as a Landscape photography camera
Pentax 645Z as a Landscape photography camera
82
focusing manually
switch lenses (Micro Four Thirds mount)
pretty good screen size (3")
has image stabilization (Sensor based 5-axis)
MP count good (20 megapixels)
nice sensor size (Four Thirds)
great ISO range (25,600)
saves RAW files
78
you can focus manually
interchangeable lenses (Pentax 645AF2 mount)
screen size is good (3.2")
fantastic megapixels (51 megapixels)
great sensor size (Medium format)
doesnt have anti aliasing filter
great ISO range (204,800)
exports RAW files
weather sealing
2 card slots
lack of image stabilization
terrible battery power (650 shots)
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Vlogging Comparison

Vlogging with Olympus E-M10 IV
Vlogging with Pentax 645Z
78
screen is selfie friendly
has touchscreen
has image stabilization (Sensor based 5-axis)
offers face detect focus
video resolution high (3840 x 2160 pxls)
does not have mic support
27
provides face detection focusing
high video quality (1920 x 1080 resolution)
does have external microphone support
doesn't offer selfie friendly display
lack of image stabilization
more heavy than competitors in class (1,550g)
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Olympus E-M10 IV vs Pentax 645Z Specifications

Detailed spec comparison table for Olympus E-M10 IV and Pentax 645Z
 Olympus OM-D E-M10 IVPentax 645Z
General Information
Company Olympus Pentax
Model Olympus OM-D E-M10 IV Pentax 645Z
Class Entry-Level Mirrorless Pro DSLR
Revealed 2020-08-04 2014-04-15
Physical type SLR-style mirrorless Large SLR
Sensor Information
Chip TruePic VIII PRIME III
Sensor type CMOS CMOS
Sensor size Four Thirds Medium format
Sensor measurements 17.4 x 13mm 44 x 33mm
Sensor surface area 226.2mm² 1,452.0mm²
Sensor resolution 20MP 51MP
Anti aliasing filter
Aspect ratio 1:1, 4:3, 3:2 and 16:9 4:3
Highest resolution 5184 x 3888 8256 x 6192
Highest native ISO 25600 204800
Minimum native ISO 200 100
RAW data
Minimum boosted ISO 100 -
Autofocusing
Focus manually
Touch to focus
Autofocus continuous
Single autofocus
Tracking autofocus
Selective autofocus
Center weighted autofocus
Multi area autofocus
Autofocus live view
Face detect focus
Contract detect focus
Phase detect focus
Number of focus points 121 27
Lens
Lens mounting type Micro Four Thirds Pentax 645AF2
Amount of lenses 107 6
Crop factor 2.1 0.8
Screen
Type of display Tilting Tilting
Display sizing 3 inch 3.2 inch
Display resolution 1,040 thousand dots 1,037 thousand dots
Selfie friendly
Liveview
Touch screen
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 60s 30s
Highest shutter speed 1/4000s 1/4000s
Highest quiet shutter speed 1/16000s -
Continuous shooting rate 8.7 frames/s 3.0 frames/s
Shutter priority
Aperture priority
Manual mode
Exposure compensation Yes Yes
Custom white balance
Image stabilization
Inbuilt flash
Flash range 7.20 m (at ISO 200) no built-in flash
Flash settings Redeye, fill-in, off, redeye slow-sync (1st-curtain), slow sync (1st-curtain), slow sync (2nd-curtain), manual 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
External flash
AEB
WB bracketing
Highest flash synchronize 1/250s 1/125s
Exposure
Multisegment
Average
Spot
Partial
AF area
Center weighted
Video features
Supported video resolutions 3840 x 2160 @ 30p / 102 Mbps, MOV, H.264, Linear PCM3840 x 2160 @ 25p / 102 Mbps, MOV, H.264, Linear PCM3840 x 2160 @ 24p / 102 Mbps, MOV, H.264, Linear PCM1920 x 1080 @ 60p / 52 Mbps, MOV, H.264, Linear PCM1920 x 1080 @ 50p / 52 Mbps, MOV, H.264, Linear PCM1920 x 1080 @ 30p / 52 Mbps, MOV, H.264, Linear PCM1920 x 1080 @ 25p / 52 Mbps, MOV, H.264, Linear PCM1920 x 1080 @ 24p / 52 Mbps, MOV, H.264, Linear PCM 1920 x 1080 (60i, 50i, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p,24p)
Highest video resolution 3840x2160 1920x1080
Video file 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 383g (0.84 lbs) 1550g (3.42 lbs)
Dimensions 122 x 84 x 49mm (4.8" x 3.3" x 1.9") 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 360 shots 650 shots
Form of battery Battery Pack Battery Pack
Battery model BLS-50 D-LI90
Self timer Yes (2 or 12 sec, custom) Yes (2 or 10 secs)
Time lapse recording
Storage type SD/SDHC/SDXC (UHS-II supported) Dual SD/SDHC/SDXC slots
Card slots 1 Dual
Retail pricing $699 $5,024