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Olympus E-M10 IV vs Pentax 645D

Portability
81
Imaging
62
Features
83
Overall
70
Olympus OM-D E-M10 IV front
 
Pentax 645D front
Portability
50
Imaging
76
Features
52
Overall
66

Olympus E-M10 IV vs Pentax 645D 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
  • Announced August 2020
  • Previous Model is Olympus E-M10 III
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
  • Launched March 2010
  • Replacement is Pentax 645Z
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Olympus E-M10 IV vs Pentax 645D Overview

Its time to look much closer at the Olympus E-M10 IV and Pentax 645D, former being a Entry-Level Mirrorless while the other is a Pro DSLR by brands Olympus and Pentax. There is a large difference between the sensor resolutions of the E-M10 IV (20MP) and 645D (40MP) and the E-M10 IV (Four Thirds) and 645D (Medium format) use totally different sensor size.

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The E-M10 IV was released 10 years later than the 645D and that is quite a serious difference as far as tech is concerned. Each of these cameras offer different body type with the Olympus E-M10 IV being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before getting straight into a comprehensive comparison, below is a quick highlight of how the E-M10 IV scores vs the 645D with regards to portability, imaging, features and an overall grade.

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

 E-M10 IV 645D 
LaunchedAugust 2020March 2010More recent by 127 months
Display typeTiltingFixed Tilting display
Display resolution1040k921kCrisper display (+119k dot)
Selfie screen Easy selfies
Touch friendly display Easily navigate

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

 645D E-M10 IV 

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

 E-M10 IV 645D 
Focus manually Very exact focusing
Display sizing3"3"Equivalent display size

Olympus E-M10 IV vs Pentax 645D Physical Comparison

When you are planning to lug around your camera often, you will have to think about its weight and size. The Olympus E-M10 IV enjoys physical measurements of 122mm x 84mm x 49mm (4.8" x 3.3" x 1.9") accompanied by a weight of 383 grams (0.84 lbs) whilst the Pentax 645D has specifications of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") accompanied by a weight of 1480 grams (3.26 lbs).

See the Olympus E-M10 IV and Pentax 645D in our completely new Camera & Lens Size Comparison Tool. Camera Size Comparison with Lenses

Don't forget, the weight of an ILC will differ depending on the lens you are utilising at that time. The following is the front view dimensions comparison of the E-M10 IV vs the 645D.

Olympus E-M10 IV vs Pentax 645D size comparison

Looking at size and weight, the portability score of the E-M10 IV and 645D is 81 and 50 respectively.

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

Olympus E-M10 IV vs Pentax 645D Sensor Comparison

Oftentimes, it is hard to visualise the gap between sensor measurements only by checking specs. The visual below should offer you a far better sense of the sensor measurements in the E-M10 IV and 645D.

All in all, the 2 cameras offer different resolutions and different sensor measurements. The E-M10 IV due to its tinier sensor will make getting shallow DOF more challenging and the Pentax 645D will give you more detail as a result of its extra 20 Megapixels. Greater resolution will also let you crop pics a little more aggressively. The younger E-M10 IV will have an edge when it comes to sensor tech.

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

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

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

Portrait Comparison

Olympus E-M10 IV Portrait photography details
Pentax 645D Portrait photography details
77
has manual focus
megapixel count decent (20 megapixels)
decent sensor size (Four Thirds)
offers face detection autofocus
supports RAW formats
77
manual focus
fantastic megapixels (40MP)
sensor size is big (Medium format)
saves RAW files
no liveview
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Street Comparison

Olympus E-M10 IV as a Street photography camera
Pentax 645D as a Street photography camera
84
tilting screen
has image stabilization (Sensor based 5-axis)
decent sensor size (Four Thirds)
supports RAW formats
has focus by touch
very good high ISO (25,600)
58
sensor size is big (Medium format)
saves RAW files
weather proofing
no articulating screen
lack of image stabilization
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Sports Comparison

Olympus E-M10 IV Sports photography advice
Pentax 645D Sports photography advice
72
silent shooting (1/16,000 seconds)
has image stabilization (Sensor based 5-axis)
megapixel count decent (20 megapixels)
decent sensor size (Four Thirds)
offers tracking autofocus
does not have phase detect autofocus
63
fantastic megapixels (40MP)
sensor size is big (Medium format)
weather proofing
sensor has phase detect autofocus
no liveview
max frames per second very slow (1.0 fps)
lack of image stabilization
not so great battery (800 shots)
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Travel Comparison

Olympus E-M10 IV Travel photography factors
Pentax 645D Travel photography factors
84
supports bluetooth
has focus by touch
megapixel count decent (20MP)
built-in flash
screen is selfie friendly
55
weather proofing
fantastic megapixels (40MP)
not so great battery (800 CIPA)
display isn't selfie friendly
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Landscape Comparison

Olympus E-M10 IV Landscape photography details
Pentax 645D Landscape photography details
82
has manual focus
swap lenses (Micro Four Thirds mount)
pretty good screen size (3")
has image stabilization (Sensor based 5-axis)
megapixel count decent (20MP)
decent sensor size (Four Thirds)
very good high ISO (25,600)
supports RAW formats
72
manual focus
interchangeable lenses (Pentax 645AF2 mount)
nice screen size (3 inches)
fantastic megapixels (40 megapixels)
sensor size is big (Medium format)
no low pass filter
saves RAW files
weather proofing
two card slots
no liveview
lack of image stabilization
not so great battery (800 CIPA)
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Vlogging Comparison

Olympus E-M10 IV Vlogging features
Pentax 645D Vlogging features
78
screen is selfie friendly
screen is touchscreen
has image stabilization (Sensor based 5-axis)
offers face detection autofocus
high res video (3840 x 2160 resolution)
no external microphone port
9
can't record video
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Olympus E-M10 IV vs Pentax 645D Specifications

Detailed spec comparison table for Olympus E-M10 IV and Pentax 645D
 Olympus OM-D E-M10 IVPentax 645D
General Information
Make Olympus Pentax
Model Olympus OM-D E-M10 IV Pentax 645D
Category Entry-Level Mirrorless Pro DSLR
Announced 2020-08-04 2010-03-10
Physical type SLR-style mirrorless Large SLR
Sensor Information
Processor Chip TruePic VIII Prime II
Sensor type CMOS CCD
Sensor size Four Thirds Medium format
Sensor dimensions 17.4 x 13mm 44 x 33mm
Sensor surface area 226.2mm² 1,452.0mm²
Sensor resolution 20 megapixels 40 megapixels
Anti aliasing filter
Aspect ratio 1:1, 4:3, 3:2 and 16:9 4:3
Full resolution 5184 x 3888 7264 x 5440
Max native ISO 25600 1600
Minimum native ISO 200 200
RAW data
Minimum boosted ISO 100 100
Autofocusing
Focus manually
Touch focus
AF continuous
Single AF
Tracking AF
AF selectice
AF center weighted
Multi area AF
Live view AF
Face detect AF
Contract detect AF
Phase detect AF
Number of focus points 121 11
Lens
Lens mount Micro Four Thirds Pentax 645AF2
Total lenses 107 6
Crop factor 2.1 0.8
Screen
Type of display Tilting Fixed Type
Display sizing 3 inch 3 inch
Resolution of display 1,040k dots 921k dots
Selfie friendly
Liveview
Touch operation
Display 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 60 secs 30 secs
Maximum shutter speed 1/4000 secs 1/4000 secs
Maximum quiet shutter speed 1/16000 secs -
Continuous shooting rate 8.7 frames per sec 1.0 frames per sec
Shutter priority
Aperture priority
Expose Manually
Exposure compensation Yes Yes
Custom WB
Image stabilization
Inbuilt flash
Flash range 7.20 m (at ISO 200) no built-in flash
Flash modes Redeye, fill-in, off, redeye slow-sync (1st-curtain), slow sync (1st-curtain), slow sync (2nd-curtain), manual Auto, On, Off, Red-eye, Slow Sync, Rear Curtain
Hot shoe
AE bracketing
WB bracketing
Maximum flash synchronize 1/250 secs 1/125 secs
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
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 -
Max video resolution 3840x2160 None
Video file 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 383g (0.84 lb) 1480g (3.26 lb)
Dimensions 122 x 84 x 49mm (4.8" x 3.3" x 1.9") 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 360 shots 800 shots
Style of battery Battery Pack Battery Pack
Battery model BLS-50 D-LI90
Self timer Yes (2 or 12 sec, custom) Yes (2 or 10 sec)
Time lapse feature
Storage type SD/SDHC/SDXC (UHS-II supported) SD/SDHC
Card slots 1 Two
Cost at launch $699 $4,000