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Olympus E-M1X vs Pentax 645D

Portability
54
Imaging
61
Features
93
Overall
73
Olympus OM-D E-M1X front
 
Pentax 645D front
Portability
50
Imaging
76
Features
52
Overall
66

Olympus E-M1X vs Pentax 645D Key Specs

Olympus E-M1X
(Full Review)
  • 20MP - Four Thirds Sensor
  • 3" Fully Articulated Display
  • ISO 200 - 25600
  • Sensor based 5-axis Image Stabilization
  • 1/8000s Max Shutter
  • 4096 x 2160 video
  • Micro Four Thirds Mount
  • 997g - 144 x 147 x 75mm
  • Revealed January 2019
  • Succeeded the Olympus E-M1 II
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
  • Updated by Pentax 645Z
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Olympus E-M1X vs Pentax 645D Overview

In this write-up, we are evaluating the Olympus E-M1X vs Pentax 645D, former is a Pro Mirrorless while the other is a Pro DSLR by competitors Olympus and Pentax. There exists a considerable gap between the sensor resolutions of the E-M1X (20MP) and 645D (40MP) and the E-M1X (Four Thirds) and 645D (Medium format) feature totally different sensor size.

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The E-M1X was revealed 9 years after the 645D which is quite a large difference as far as technology is concerned. Both of these cameras offer different body type with the Olympus E-M1X being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before getting through a complete comparison, below is a brief view of how the E-M1X matches up against the 645D in terms of portability, imaging, features and an overall mark.

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Reasons to pick Olympus E-M1X over the Pentax 645D

 E-M1X 645D 
LaunchedJanuary 2019March 2010Newer by 109 months
Display typeFully ArticulatedFixed Fully Articulating display
Display resolution1037k921kClearer display (+116k dot)
Selfie screen Easy selfies
Touch friendly display Easily navigate

Reasons to pick Pentax 645D over the Olympus E-M1X

 645D E-M1X 

Common features in the Olympus E-M1X and Pentax 645D

 E-M1X 645D 
Focus manually Dial precise focus
Display sizing3"3"Equivalent display size

Olympus E-M1X vs Pentax 645D Physical Comparison

In case you're looking to travel with your camera often, you will need to factor in its weight and measurements. The Olympus E-M1X enjoys outside measurements of 144mm x 147mm x 75mm (5.7" x 5.8" x 3.0") along with a weight of 997 grams (2.20 lbs) while the Pentax 645D has proportions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") along with a weight of 1480 grams (3.26 lbs).

Contrast the Olympus E-M1X vs Pentax 645D in our completely new Camera plus Lens Size Comparison Tool. Camera Size Comparison with Lenses

Remember, the weight of an ILC will vary dependant on the lens you are using during that time. Underneath is the front view dimension comparison of the E-M1X versus the 645D.

Olympus E-M1X vs Pentax 645D size comparison

Using dimensions and weight, the portability rating of the E-M1X and 645D is 54 and 50 respectively.

Olympus E-M1X vs Pentax 645D top view buttons comparison

Olympus E-M1X vs Pentax 645D Sensor Comparison

Sometimes, its tough to see the difference between sensor dimensions purely by reading through specs. The image here may provide you a clearer sense of the sensor measurements in the E-M1X and 645D.

As you can plainly see, both of the cameras offer different megapixel count and different sensor dimensions. The E-M1X having a tinier sensor will make shooting shallower depth of field more challenging and the Pentax 645D will give extra detail because of its extra 20MP. Greater resolution can also let you crop pics a little more aggressively. The younger E-M1X is going to have an edge when it comes to sensor tech.

Olympus E-M1X vs Pentax 645D sensor size comparison

Olympus E-M1X vs Pentax 645D Screen and ViewFinder

Olympus E-M1X vs Pentax 645D Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Olympus E-M1X Portrait photography information
Pentax 645D Portrait photography information
76
you can focus manually
good megapixels (20 megapixels)
good sensor size (Four Thirds)
includes face detect focusing
delivers RAW formats
77
focusing manually
MP count fantastic (40MP)
great sensor size (Medium format)
saves RAW formats
no liveview
Photography Glossary

Street Comparison

Olympus E-M1X Street photography highlights
Pentax 645D Street photography highlights
67
fully articulated screen
image stabilization (Sensor based 5-axis)
good sensor size (Four Thirds)
delivers RAW formats
boasts focus by touch
weather proofing
above average high ISO (25,600)
more heavy than competition in class (997 grams)
58
great sensor size (Medium format)
saves RAW formats
weather proof
screen does not articulate
does not have image stabilization
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Sports Comparison

Olympus E-M1X Sports photography details
Pentax 645D Sports photography details
80
great max shutter speed (1/8,000 seconds)
quiet shutter (1/32,000 seconds)
max frames per second high (60.0 frames/s)
image stabilization (Sensor based 5-axis)
good megapixels (20MP)
good sensor size (Four Thirds)
includes tracking focus
weather proofing
good battery life (870 CIPA)
sensor has phase detect AF
63
MP count fantastic (40 megapixels)
great sensor size (Medium format)
weather proof
supports phase detect autofocus
no liveview
very slow continuous shooting (1.0 frames per second)
does not have image stabilization
low battery (800 per charge)
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Travel Comparison

Olympus E-M1X Travel photography factors
Pentax 645D Travel photography factors
68
good battery life (870 CIPA)
weather proofing
supports bluetooth
boasts focus by touch
good megapixels (20 megapixels)
screen is selfie friendly
more heavy than competition in class (997 grams)
55
weather proof
MP count fantastic (40 megapixels)
low battery (800 shots)
doesn't feature selfie friendly display
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Landscape Comparison

Olympus E-M1X Landscape photography highlights
Pentax 645D Landscape photography highlights
79
you can focus manually
interchangeable lenses (Micro Four Thirds mount)
screen size is good (3")
image stabilization (Sensor based 5-axis)
good megapixels (20MP)
good sensor size (Four Thirds)
above average high ISO (25,600)
delivers RAW formats
weather proofing
good battery life (870 per charge)
two card slots
72
focusing manually
interchangeable lenses (Pentax 645AF2 mount)
screen size is good (3")
MP count fantastic (40 megapixels)
great sensor size (Medium format)
does not have anti aliasing filter
saves RAW formats
weather proof
has dual storage slots
no liveview
does not have image stabilization
low battery (800 per charge)
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Vlogging Comparison

Olympus E-M1X Vlogging information
Pentax 645D Vlogging information
68
screen is selfie friendly
touch screen
image stabilization (Sensor based 5-axis)
includes face detect focusing
video resolution high (4096 x 2160 pixels)
includes microphone socket
more heavy than competition in class (997g)
9
no video
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Olympus E-M1X vs Pentax 645D Specifications

Detailed spec comparison table for Olympus E-M1X and Pentax 645D
 Olympus OM-D E-M1XPentax 645D
General Information
Brand Name Olympus Pentax
Model type Olympus OM-D E-M1X Pentax 645D
Class Pro Mirrorless Pro DSLR
Revealed 2019-01-24 2010-03-10
Body design SLR-style mirrorless Large SLR
Sensor Information
Powered by Dual TruePic VIII Prime II
Sensor type CMOS CCD
Sensor size Four Thirds Medium format
Sensor measurements 17.4 x 13mm 44 x 33mm
Sensor area 226.2mm² 1,452.0mm²
Sensor resolution 20 megapixels 40 megapixels
Anti alias filter
Aspect ratio 4:3 4:3
Full resolution 5184 x 3888 7264 x 5440
Max native ISO 25600 1600
Min native ISO 200 200
RAW data
Min boosted ISO 64 100
Autofocusing
Manual focusing
Touch focus
Continuous autofocus
Single autofocus
Autofocus tracking
Selective autofocus
Center weighted autofocus
Autofocus multi area
Autofocus live view
Face detect focus
Contract detect focus
Phase detect focus
Total focus points 121 11
Lens
Lens support Micro Four Thirds Pentax 645AF2
Number of lenses 107 6
Crop factor 2.1 0.8
Screen
Range of display Fully Articulated Fixed Type
Display diagonal 3" 3"
Resolution of display 1,037 thousand dot 921 thousand dot
Selfie friendly
Liveview
Touch screen
Display tech - TFT Color LCD with wide-viewing angle and with AR coating
Viewfinder Information
Viewfinder Electronic Optical (pentaprism)
Viewfinder resolution 2,360 thousand dot -
Viewfinder coverage 100% 98%
Viewfinder magnification 0.74x 0.85x
Features
Slowest shutter speed 60 seconds 30 seconds
Maximum shutter speed 1/8000 seconds 1/4000 seconds
Maximum quiet shutter speed 1/32000 seconds -
Continuous shooting speed 60.0fps 1.0fps
Shutter priority
Aperture priority
Manual exposure
Exposure compensation Yes Yes
Set white balance
Image stabilization
Inbuilt flash
Flash distance no built-in flash no built-in flash
Flash modes 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, Slow Sync, Rear Curtain
External flash
AEB
White balance bracketing
Maximum flash sync - 1/125 seconds
Exposure
Multisegment metering
Average metering
Spot metering
Partial metering
AF area metering
Center weighted metering
Video features
Supported video resolutions 4096 x 2160 @ 24p / 237 Mbps, 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 Yes (USB-PD allows charging by laptop or external power bank) USB 2.0 (480 Mbit/sec)
GPS Built-in None
Physical
Environment seal
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 997 grams (2.20 lb) 1480 grams (3.26 lb)
Dimensions 144 x 147 x 75mm (5.7" x 5.8" x 3.0") 156 x 117 x 119mm (6.1" x 4.6" x 4.7")
DXO scores
DXO All around rating not tested 82
DXO Color Depth rating not tested 24.6
DXO Dynamic range rating not tested 12.6
DXO Low light rating not tested 1262
Other
Battery life 870 photographs 800 photographs
Battery format Built-in Battery Pack
Battery ID - D-LI90
Self timer Yes (2 or 12 secs, custom) Yes (2 or 10 sec)
Time lapse feature
Storage media - SD/SDHC
Storage slots Dual Dual
Retail pricing $2,999 $4,000