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Olympus E-M5 II vs Pentax 645D

Portability
80
Imaging
53
Features
84
Overall
65
Olympus OM-D E-M5 II front
 
Pentax 645D front
Portability
50
Imaging
76
Features
52
Overall
66

Olympus E-M5 II vs Pentax 645D Key Specs

Olympus E-M5 II
(Full Review)
  • 16MP - Four Thirds Sensor
  • 3" Fully Articulated Display
  • ISO 200 - 25600
  • Sensor based 5-axis Image Stabilization
  • 1/8000s Max Shutter
  • 1920 x 1080 video
  • Micro Four Thirds Mount
  • 469g - 124 x 85 x 45mm
  • Announced February 2015
  • Superseded the Olympus E-M5
  • New Model is Olympus E-M5 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
  • Announced March 2010
  • Replacement is Pentax 645Z
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Olympus E-M5 II vs Pentax 645D Overview

Lets look closer at the Olympus E-M5 II and Pentax 645D, one being a Advanced Mirrorless and the other is a Pro DSLR by manufacturers Olympus and Pentax. There is a sizeable difference among the sensor resolutions of the E-M5 II (16MP) and 645D (40MP) and the E-M5 II (Four Thirds) and 645D (Medium format) posses totally different sensor sizing.

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The E-M5 II was introduced 4 years later than the 645D and that is a fairly large gap as far as camera tech is concerned. Each of these cameras have different body design with the Olympus E-M5 II being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before diving into a thorough comparison, here is a simple introduction of how the E-M5 II grades against the 645D in the way of portability, imaging, features and an overall grade.

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Reasons to pick Olympus E-M5 II over the Pentax 645D

 E-M5 II 645D 
AnnouncedFebruary 2015March 2010More recent by 60 months
Display typeFully ArticulatedFixed Fully Articulating display
Display resolution1037k921kClearer display (+116k dot)
Selfie screen Take selfies
Touch friendly display Easily navigate

Reasons to pick Pentax 645D over the Olympus E-M5 II

 645D E-M5 II 

Common features in the Olympus E-M5 II and Pentax 645D

 E-M5 II 645D 
Focus manually More exact focus
Display dimensions3"3"Equal display measurement

Olympus E-M5 II vs Pentax 645D Physical Comparison

If you're aiming to lug around your camera regularly, you have to take into account its weight and measurements. The Olympus E-M5 II comes with exterior measurements of 124mm x 85mm x 45mm (4.9" x 3.3" x 1.8") having a weight of 469 grams (1.03 lbs) while the Pentax 645D has proportions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") and a weight of 1480 grams (3.26 lbs).

See the Olympus E-M5 II and Pentax 645D in the new Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses

Remember that, the weight of an Interchangeable Lens Camera will change based on the lens you are utilizing at that moment. Below is a front view physical size comparison of the E-M5 II versus the 645D.

Olympus E-M5 II vs Pentax 645D size comparison

Taking into consideration size and weight, the portability rating of the E-M5 II and 645D is 80 and 50 respectively.

Olympus E-M5 II vs Pentax 645D top view buttons comparison

Olympus E-M5 II vs Pentax 645D Sensor Comparison

Usually, it is very tough to see the gap in sensor measurements just by seeing specs. The graphic below might offer you a much better sense of the sensor sizing in the E-M5 II and 645D.

As you can plainly see, both cameras have different resolutions and different sensor measurements. The E-M5 II using its smaller sensor will make getting shallower DOF more difficult and the Pentax 645D will produce more detail using its extra 24 Megapixels. Greater resolution will let you crop pics a bit more aggressively. The more recent E-M5 II is going to have an advantage when it comes to sensor tech.

Olympus E-M5 II vs Pentax 645D sensor size comparison

Olympus E-M5 II vs Pentax 645D Screen and ViewFinder

Olympus E-M5 II vs Pentax 645D Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Olympus E-M5 II Portrait photography factors
Pentax 645D Portrait photography factors
71
has manual focus
sensor resolution is decent (16MP)
sensor size is nice (Four Thirds)
has face detect focusing
delivers RAW formats
77
you can focus manually
fantastic resolution (40 megapixels)
big sensor size (Medium format)
delivers RAW formats
no liveview
Photography Glossary

Street Comparison

Olympus E-M5 II as a Street photography camera
Pentax 645D as a Street photography camera
82
screen can move to multiple angles
image stabilization (Sensor based 5-axis)
sensor size is nice (Four Thirds)
delivers RAW formats
has touch focus
weather proofing
good ISO range (25,600)
58
big sensor size (Medium format)
delivers RAW formats
weather proofing
screen is fixed
lack of image stabilization
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Sports Comparison

Olympus E-M5 II Sports photography features
Pentax 645D Sports photography features
65
great max shutter speed (1/8,000s)
silent shooting (1/16,000s)
image stabilization (Sensor based 5-axis)
sensor resolution is decent (16 megapixels)
sensor size is nice (Four Thirds)
has tracking focus
weather proofing
not so great battery life (310 CIPA)
does not have phase detect AF
63
fantastic resolution (40MP)
big sensor size (Medium format)
weather proofing
sensor has phase detect AF
no liveview
slow frames per second (1.0 frames/s)
lack of image stabilization
terrible battery life (800 CIPA)
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Travel Comparison

Olympus E-M5 II Travel photography factors
Pentax 645D Travel photography factors
74
weather proofing
has touch focus
sensor resolution is decent (16MP)
display is selfie friendly
not so great battery life (310 shots)
55
weather proofing
fantastic resolution (40 megapixels)
terrible battery life (800 shots)
does not contain selfie friendly display
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Landscape Comparison

Olympus E-M5 II Landscape photography highlights
Pentax 645D Landscape photography highlights
74
has manual focus
change lenses (Micro Four Thirds mount)
screen is a decent size (3 inch)
image stabilization (Sensor based 5-axis)
sensor resolution is decent (16 megapixels)
sensor size is nice (Four Thirds)
good ISO range (25,600)
delivers RAW formats
weather proofing
not so great battery life (310 CIPA)
72
you can focus manually
switch lenses (Pentax 645AF2 mount)
screen size is good (3")
fantastic resolution (40MP)
big sensor size (Medium format)
does not have anti aliasing filter
delivers RAW formats
weather proofing
has dual storage slots
no liveview
lack of image stabilization
terrible battery life (800 CIPA)
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Vlogging Comparison

Olympus E-M5 II Vlogging info
Pentax 645D Vlogging info
82
display is selfie friendly
touchscreen
image stabilization (Sensor based 5-axis)
has face detect focusing
video resolution high (1920 x 1080 pxls)
has microphone jack
9
can't record video
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Olympus E-M5 II vs Pentax 645D Specifications

Detailed spec comparison table for Olympus E-M5 II and Pentax 645D
 Olympus OM-D E-M5 IIPentax 645D
General Information
Manufacturer Olympus Pentax
Model type Olympus OM-D E-M5 II Pentax 645D
Class Advanced Mirrorless Pro DSLR
Announced 2015-02-06 2010-03-10
Body design SLR-style mirrorless Large SLR
Sensor Information
Processor Chip TruePic VII Prime II
Sensor type MOS CCD
Sensor size Four Thirds Medium format
Sensor dimensions 17.3 x 13mm 44 x 33mm
Sensor surface area 224.9mm² 1,452.0mm²
Sensor resolution 16MP 40MP
Anti alias filter
Aspect ratio 1:1, 4:3, 3:2 and 16:9 4:3
Max resolution 4608 x 3456 7264 x 5440
Max native ISO 25600 1600
Lowest native ISO 200 200
RAW support
Lowest enhanced ISO 100 100
Autofocusing
Focus manually
Touch focus
Autofocus continuous
Single autofocus
Tracking autofocus
Autofocus selectice
Autofocus center weighted
Multi area autofocus
Live view autofocus
Face detect autofocus
Contract detect autofocus
Phase detect autofocus
Total focus points 81 11
Lens
Lens support Micro Four Thirds Pentax 645AF2
Total lenses 107 6
Crop factor 2.1 0.8
Screen
Range of display Fully Articulated Fixed Type
Display sizing 3" 3"
Display resolution 1,037 thousand dot 921 thousand dot
Selfie friendly
Liveview
Touch display
Display technology - 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
Minimum shutter speed 60s 30s
Fastest shutter speed 1/8000s 1/4000s
Fastest quiet shutter speed 1/16000s -
Continuous shutter speed 10.0 frames/s 1.0 frames/s
Shutter priority
Aperture priority
Expose Manually
Exposure compensation Yes Yes
Custom white balance
Image stabilization
Inbuilt flash
Flash distance no built-in flash no built-in flash
Flash options Auto, redeye, fill, off, redeye slow sync, slow sync, 2nd-curtain slow sync, manual Auto, On, Off, Red-eye, Slow Sync, Rear Curtain
External flash
AEB
White balance bracketing
Fastest flash sync 1/250s 1/125s
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
Video features
Video resolutions 1920 x 1080 (60p, 50p, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p, 24p), 640 x 480 (30p) -
Max video resolution 1920x1080 None
Video data format MPEG-4, H.264, Motion JPEG -
Mic input
Headphone input
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 seal
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 469 gr (1.03 lb) 1480 gr (3.26 lb)
Physical dimensions 124 x 85 x 45mm (4.9" x 3.3" x 1.8") 156 x 117 x 119mm (6.1" x 4.6" x 4.7")
DXO scores
DXO Overall rating 73 82
DXO Color Depth rating 23.0 24.6
DXO Dynamic range rating 12.4 12.6
DXO Low light rating 896 1262
Other
Battery life 310 pictures 800 pictures
Battery format Battery Pack Battery Pack
Battery ID BLN-1 D-LI90
Self timer Yes (2 or 10 secs, custom) Yes (2 or 10 sec)
Time lapse shooting
Type of storage SD/SDHC/SDXC SD/SDHC
Storage slots 1 2
Pricing at release $699 $4,000