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Olympus E-M1 III vs Pentax 645D

Portability
67
Imaging
62
Features
96
Overall
75
Olympus OM-D E-M1 Mark III front
 
Pentax 645D front
Portability
50
Imaging
76
Features
52
Overall
66

Olympus E-M1 III vs Pentax 645D Key Specs

Olympus E-M1 III
(Full Review)
  • 20MP - Four Thirds Sensor
  • 3" Fully Articulated Screen
  • ISO 200 - 25600
  • Sensor based 5-axis Image Stabilization
  • No Anti-Alias Filter
  • 1/8000s Maximum Shutter
  • 4096 x 2160 video
  • Micro Four Thirds Mount
  • 580g - 134 x 91 x 69mm
  • Announced February 2020
  • Earlier Model is Olympus E-M1 II
Pentax 645D
(Full Review)
  • 40MP - Medium format Sensor
  • 3" Fixed Screen
  • ISO 200 - 1600
  • No Anti-Alias Filter
  • No Video
  • Pentax 645AF2 Mount
  • 1480g - 156 x 117 x 119mm
  • Introduced March 2010
  • Later Model is Pentax 645Z
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Olympus E-M1 III vs Pentax 645D Overview

Below, we will be analyzing the Olympus E-M1 III and Pentax 645D, one being a Pro Mirrorless and the latter is a Pro DSLR by manufacturers Olympus and Pentax. There is a crucial difference among the resolutions of the E-M1 III (20MP) and 645D (40MP) and the E-M1 III (Four Thirds) and 645D (Medium format) possess totally different sensor size.

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The E-M1 III was released 10 years later than the 645D and that is a fairly serious gap as far as camera tech is concerned. Both of these cameras come with different body type with the Olympus E-M1 III being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before going straight into a thorough comparison, below is a concise view of how the E-M1 III grades vs the 645D in regards to portability, imaging, features and an overall grade.

Photography Glossary
	
	

Reasons to pick Olympus E-M1 III over the Pentax 645D

 E-M1 III 645D 
IntroducedFebruary 2020March 2010More recent by 121 months
Screen typeFully ArticulatedFixed Fully Articulating screen
Screen resolution1037k921kCrisper screen (+116k dot)
Selfie screen Easy selfies
Touch screen Quickly navigate

Reasons to pick Pentax 645D over the Olympus E-M1 III

 645D E-M1 III 

Common features in the Olympus E-M1 III and Pentax 645D

 E-M1 III 645D 
Manually focus Dial precise focusing
Screen dimension3"3"Identical screen size

Olympus E-M1 III vs Pentax 645D Physical Comparison

For anybody who is planning to lug around your camera often, you should think about its weight and dimensions. The Olympus E-M1 III features exterior measurements of 134mm x 91mm x 69mm (5.3" x 3.6" x 2.7") with a weight of 580 grams (1.28 lbs) whilst the Pentax 645D has dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") and a weight of 1480 grams (3.26 lbs).

Look at the Olympus E-M1 III and Pentax 645D in the new Camera and Lens Size Comparison Tool. Camera Size Comparison with Lenses

Take into account, the weight of an Interchangeable Lens Camera will differ depending on the lens you select during that time. Here is the front view proportions comparison of the E-M1 III vs the 645D.

Olympus E-M1 III vs Pentax 645D size comparison

Taking into consideration size and weight, the portability grade of the E-M1 III and 645D is 67 and 50 respectively.

Olympus E-M1 III vs Pentax 645D top view buttons comparison

Olympus E-M1 III vs Pentax 645D Sensor Comparison

Usually, its hard to envision the difference in sensor measurements only by seeing specifications. The visual here may provide you a greater sense of the sensor sizing in the E-M1 III and 645D.

Plainly, the two cameras have got different resolutions and different sensor measurements. The E-M1 III featuring a smaller sensor will make shooting bokeh more difficult and the Pentax 645D will produce extra detail as a result of its extra 20 Megapixels. Higher resolution will allow you to crop pictures much more aggressively. The younger E-M1 III will have an edge with regard to sensor innovation.

Olympus E-M1 III vs Pentax 645D sensor size comparison

Olympus E-M1 III vs Pentax 645D Screen and ViewFinder

Olympus E-M1 III vs Pentax 645D Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Olympus E-M1 III Portrait photography information
Pentax 645D Portrait photography information
77
you can focus manually
decent MP (20MP)
good sensor size (Four Thirds)
comes with face detection focusing
supports RAW formats
77
has manual focus
fantastic megapixels (40 megapixels)
sensor size is large (Medium format)
supports RAW formats
doesn't have liveview
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Street Comparison

Olympus E-M1 III as a Street photography camera
Pentax 645D as a Street photography camera
78
screen can move to multiple angles
image stabilization (Sensor based 5-axis)
good sensor size (Four Thirds)
supports RAW formats
boasts focus via touch
weather proofing
great high ISO (25,600)
58
sensor size is large (Medium format)
supports RAW formats
environment proof
screen does not articulate
no image stabilization
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Sports Comparison

Olympus E-M1 III Sports photography features
Pentax 645D Sports photography features
81
max shutter speed is good (1/8,000s)
silent shooting (1/32,000s)
high frames per second (60.0 frames per second)
image stabilization (Sensor based 5-axis)
decent MP (20 megapixels)
good sensor size (Four Thirds)
comes with tracking autofocus
weather proofing
sensor has phase detect AF
63
fantastic megapixels (40MP)
sensor size is large (Medium format)
environment proof
comes with phase detect AF
doesn't have liveview
slow fps (1.0 frames/s)
no image stabilization
terrible battery pack (800 CIPA)
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Travel Comparison

Olympus E-M1 III Travel photography features
Pentax 645D Travel photography features
79
weather proofing
has bluetooth
boasts focus via touch
decent MP (20MP)
screen is selfie friendly
55
environment proof
fantastic megapixels (40MP)
terrible battery pack (800 CIPA)
screen is not selfie friendly
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Landscape Comparison

Olympus E-M1 III Landscape photography features
Pentax 645D Landscape photography features
81
you can focus manually
swap lenses (Micro Four Thirds mount)
pretty good screen size (3 inch)
image stabilization (Sensor based 5-axis)
decent MP (20MP)
good sensor size (Four Thirds)
does not have low pass filter
great high ISO (25,600)
supports RAW formats
weather proofing
2 card slots
72
has manual focus
swap lenses (Pentax 645AF2 mount)
screen size is good (3 inch)
fantastic megapixels (40MP)
sensor size is large (Medium format)
does not have anti aliasing filter
supports RAW formats
environment proof
has double storage slots
doesn't have liveview
no image stabilization
terrible battery pack (800 CIPA)
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Vlogging Comparison

Olympus E-M1 III Vlogging info
Pentax 645D Vlogging info
79
screen is selfie friendly
touch screen
image stabilization (Sensor based 5-axis)
comes with face detection focusing
high res video (4096 x 2160 pixels)
includes external mic support
9
can't shoot video
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Olympus E-M1 III vs Pentax 645D Specifications

Detailed spec comparison table for Olympus E-M1 III and Pentax 645D
 Olympus OM-D E-M1 Mark IIIPentax 645D
General Information
Make Olympus Pentax
Model type Olympus OM-D E-M1 Mark III Pentax 645D
Class Pro Mirrorless Pro DSLR
Announced 2020-02-11 2010-03-10
Body design SLR-style mirrorless Large SLR
Sensor Information
Powered by TruePic IX Prime II
Sensor type CMOS CCD
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 20 megapixel 40 megapixel
Anti alias filter
Aspect ratio 4:3 4:3
Peak resolution 5184 x 3888 7264 x 5440
Highest native ISO 25600 1600
Lowest native ISO 200 200
RAW photos
Lowest enhanced ISO 64 100
Autofocusing
Manual focusing
AF touch
AF continuous
AF single
AF tracking
AF selectice
Center weighted AF
Multi area AF
Live view AF
Face detection AF
Contract detection AF
Phase detection AF
Total focus points 121 11
Cross type focus points 121 -
Lens
Lens mount type Micro Four Thirds Pentax 645AF2
Number of lenses 107 6
Focal length multiplier 2.1 0.8
Screen
Range of screen Fully Articulated Fixed Type
Screen size 3 inch 3 inch
Resolution of screen 1,037k dot 921k dot
Selfie friendly
Liveview
Touch capability
Screen tech - TFT Color LCD with wide-viewing angle and with AR coating
Viewfinder Information
Viewfinder Electronic Optical (pentaprism)
Viewfinder resolution 2,360k dot -
Viewfinder coverage 100 percent 98 percent
Viewfinder magnification 0.74x 0.85x
Features
Min shutter speed 60 seconds 30 seconds
Max shutter speed 1/8000 seconds 1/4000 seconds
Max silent shutter speed 1/32000 seconds -
Continuous shutter speed 60.0 frames/s 1.0 frames/s
Shutter priority
Aperture priority
Expose Manually
Exposure compensation Yes Yes
Change WB
Image stabilization
Built-in flash
Flash distance no built-in flash no built-in flash
Flash options 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
Auto exposure bracketing
WB bracketing
Max flash sync 1/250 seconds 1/125 seconds
Exposure
Multisegment
Average
Spot
Partial
AF area
Center weighted
Video features
Supported video resolutions 4096 x 2160 @ 24p / 237 Mbps, MOV, H.264, Linear PCM3840 x 2160 @ 30p / 102 Mbps, MOV, H.264, Linear PCM3840 x 2160 @ 25p / 102 Mbps, MOV, H.264, Linear PCM3840 x 2160 @ 23.98p / 102 Mbps, MOV, H.264, Linear PCM1920 x 1080 @ 60p, MOV, H.264, Linear PCM1920 x 1080 @ 50p, MOV, H.264, Linear PCM1920 x 1080 @ 30p, MOV, H.264, Linear PCM1920 x 1080 @ 25p, MOV, H.264, Linear PCM1920 x 1080 @ 23.98p, MOV, H.264, Linear PCM -
Highest video resolution 4096x2160 None
Video format MPEG-4, H.264 -
Microphone jack
Headphone jack
Connectivity
Wireless Built-In None
Bluetooth
NFC
HDMI
USB USB 3.1 Gen 1 (5 GBit/sec) USB 2.0 (480 Mbit/sec)
GPS None None
Physical
Environmental seal
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 580 gr (1.28 lb) 1480 gr (3.26 lb)
Dimensions 134 x 91 x 69mm (5.3" x 3.6" x 2.7") 156 x 117 x 119mm (6.1" x 4.6" x 4.7")
DXO scores
DXO Overall 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 420 shots 800 shots
Form of battery Battery Pack Battery Pack
Battery ID BLH-1 D-LI90
Self timer Yes (2 or 12 secs, custom) Yes (2 or 10 sec)
Time lapse feature
Storage media Dual SD/SDHC/SDXC slots (UHS-II on first slot) SD/SDHC
Storage slots Dual Dual
Launch pricing $1,800 $4,000