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Olympus E-M1 II vs Pentax 645Z

Portability
68
Imaging
59
Features
93
Overall
72
Olympus OM-D E-M1 Mark II front
 
Pentax 645Z front
Portability
49
Imaging
80
Features
74
Overall
77

Olympus E-M1 II vs Pentax 645Z Key Specs

Olympus E-M1 II
(Full Review)
  • 20MP - Four Thirds Sensor
  • 3" Fully Articulated Display
  • ISO 200 - 25600
  • Sensor based 5-axis Image Stabilization
  • No Anti-Alias Filter
  • 1/8000s Max Shutter
  • 4096 x 2160 video
  • Micro Four Thirds Mount
  • 574g - 134 x 91 x 67mm
  • Revealed September 2016
  • Older Model is Olympus E-M1
  • Refreshed by Olympus E-M1 III
Pentax 645Z
(Full Review)
  • 51MP - Medium format Sensor
  • 3.2" Tilting Screen
  • ISO 100 - 204800
  • No Anti-Alias Filter
  • 1920 x 1080 video
  • Pentax 645AF2 Mount
  • 1550g - 156 x 117 x 123mm
  • Introduced April 2014
  • Old Model is Pentax 645D
Photography Glossary

Olympus E-M1 II vs Pentax 645Z Overview

Below, we will be comparing the Olympus E-M1 II vs Pentax 645Z, former is a Pro Mirrorless while the latter is a Pro DSLR by brands Olympus and Pentax. There is a considerable difference among the sensor resolutions of the E-M1 II (20MP) and 645Z (51MP) and the E-M1 II (Four Thirds) and 645Z (Medium format) feature different sensor measurements.

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The E-M1 II was manufactured 2 years after the 645Z which is a fairly large difference as far as camera tech is concerned. The two cameras come with different body type with the Olympus E-M1 II being a SLR-style mirrorless camera and the Pentax 645Z being a Large SLR camera.

Before getting through a in-depth comparison, below is a concise introduction of how the E-M1 II matches up vs the 645Z when considering portability, imaging, features and an overall score.

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Reasons to pick Olympus E-M1 II over the Pentax 645Z

 E-M1 II 645Z 
IntroducedSeptember 2016April 2014More modern by 30 months
Screen typeFully ArticulatedTiltingFully Articulating screen
Selfie screen Easy selfies
Touch friendly screen Quickly navigate

Reasons to pick Pentax 645Z over the Olympus E-M1 II

 645Z E-M1 II 
Screen dimension3.2"3"Bigger screen (+0.2")

Common features in the Olympus E-M1 II and Pentax 645Z

 E-M1 II 645Z 
Manually focus Dial exact focusing
Screen resolution1037k1037kIdentical screen resolution

Olympus E-M1 II vs Pentax 645Z Physical Comparison

If you are planning to carry around your camera, you have to factor its weight and dimensions. The Olympus E-M1 II features external dimensions of 134mm x 91mm x 67mm (5.3" x 3.6" x 2.6") and a weight of 574 grams (1.27 lbs) while the Pentax 645Z has dimensions of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") and a weight of 1550 grams (3.42 lbs).

Examine the Olympus E-M1 II vs Pentax 645Z in our brand new Camera & Lens Size Comparison Tool. Camera Size Comparison with Lenses

Bear in mind, the weight of an ILC will differ dependant on the lens you select at the time. Here is the front view scale comparison of the E-M1 II versus the 645Z.

Olympus E-M1 II vs Pentax 645Z size comparison

Using size and weight, the portability score of the E-M1 II and 645Z is 68 and 49 respectively.

Olympus E-M1 II vs Pentax 645Z top view buttons comparison

Olympus E-M1 II vs Pentax 645Z Sensor Comparison

Often, its tough to picture the difference in sensor sizes only by looking through a spec sheet. The image below might provide you a more clear sense of the sensor dimensions in the E-M1 II and 645Z.

Clearly, the 2 cameras posses different megapixel count and different sensor sizes. The E-M1 II because of its smaller sensor is going to make shooting shallow depth of field tougher and the Pentax 645Z will render more detail due to its extra 31 Megapixels. Higher resolution can also enable you to crop pictures somewhat more aggressively. The younger E-M1 II provides a benefit in sensor tech.

Olympus E-M1 II vs Pentax 645Z sensor size comparison

Olympus E-M1 II vs Pentax 645Z Screen and ViewFinder

Olympus E-M1 II vs Pentax 645Z Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Olympus E-M1 II Portrait photography details
Pentax 645Z Portrait photography details
75
focusing manually
megapixel count decent (20MP)
sensor size is nice (Four Thirds)
provides face detect focus
supports RAW formats
88
you can focus manually
amazing MP (51MP)
sensor size is large (Medium format)
includes face detection focus
saves RAW formats
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Street Comparison

Street photography with Olympus E-M1 II
Street photography with Pentax 645Z
78
screen can move to multiple angles
has image stabilization (Sensor based 5-axis)
sensor size is nice (Four Thirds)
supports RAW formats
has focus by touch
environment proofing
lighter than competition in class (574 grams)
good ISO range (25,600)
63
has a tilting screen
sensor size is large (Medium format)
saves RAW formats
environment proof
above average high ISO (204,800)
no image stabilization
more heavy than others (1,550 grams)
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Sports Comparison

Olympus E-M1 II Sports photography factors
Pentax 645Z Sports photography factors
74
maximum shutter speed is high (1/8,000s)
silent mode (1/32,000s)
max fps high (60.0 fps)
has image stabilization (Sensor based 5-axis)
megapixel count decent (20 megapixels)
sensor size is nice (Four Thirds)
provides tracking focus
environment proofing
has phase detect auto focus
not so great battery pack (350 CIPA)
71
amazing MP (51MP)
sensor size is large (Medium format)
includes tracking autofocus
environment proof
supports phase detect auto focus
max frames per second low (3.0 fps)
no image stabilization
bad battery (650 per charge)
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Travel Comparison

Olympus E-M1 II Travel photography details
Pentax 645Z Travel photography details
72
lighter than competition in class (574 grams)
environment proofing
has focus by touch
megapixel count decent (20 megapixels)
selfie friendly screen
not so great battery pack (350 CIPA)
51
environment proof
amazing MP (51MP)
bad battery (650 CIPA)
more heavy than others (1,550g)
display is not selfie friendly
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Landscape Comparison

Landscape photography with Olympus E-M1 II
Landscape photography with Pentax 645Z
76
focusing manually
swap lenses (Micro Four Thirds mount)
screen size is good (3 inches)
has image stabilization (Sensor based 5-axis)
megapixel count decent (20 megapixels)
sensor size is nice (Four Thirds)
doesnt have low pass filter
good ISO range (25,600)
supports RAW formats
environment proofing
has dual storage slots
not so great battery pack (350 CIPA)
78
you can focus manually
switch lenses (Pentax 645AF2 mount)
good sized screen (3.2")
amazing MP (51MP)
sensor size is large (Medium format)
no anti-alias filter
above average high ISO (204,800)
saves RAW formats
environment proof
two card slots
no image stabilization
bad battery (650 CIPA)
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Vlogging Comparison

Vlogging with Olympus E-M1 II
Vlogging with Pentax 645Z
79
selfie friendly screen
touchscreen functionality
has image stabilization (Sensor based 5-axis)
provides face detect focus
high quality video (4096 x 2160 pixels)
has microphone jack
lighter than competition in class (574g)
27
includes face detection focus
high quality video (1920 x 1080 pxls)
comes with external microphone socket
display is not selfie friendly
no image stabilization
more heavy than others (1,550g)
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Olympus E-M1 II vs Pentax 645Z Specifications

Detailed spec comparison table for Olympus E-M1 II and Pentax 645Z
 Olympus OM-D E-M1 Mark IIPentax 645Z
General Information
Make Olympus Pentax
Model type Olympus OM-D E-M1 Mark II Pentax 645Z
Category Pro Mirrorless Pro DSLR
Revealed 2016-09-19 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 area 226.2mm² 1,452.0mm²
Sensor resolution 20 megapixel 51 megapixel
Anti alias filter
Aspect ratio 4:3 4:3
Maximum resolution 5184 x 3888 8256 x 6192
Maximum native ISO 25600 204800
Min native ISO 200 100
RAW format
Min boosted ISO 64 -
Autofocusing
Manual focusing
Autofocus touch
Continuous autofocus
Single autofocus
Autofocus tracking
Selective autofocus
Autofocus center weighted
Autofocus multi area
Autofocus live view
Face detect autofocus
Contract detect autofocus
Phase detect autofocus
Total focus points 121 27
Lens
Lens support Micro Four Thirds Pentax 645AF2
Amount of lenses 107 6
Focal length multiplier 2.1 0.8
Screen
Type of display Fully Articulated Tilting
Display diagonal 3" 3.2"
Resolution of display 1,037k dots 1,037k dots
Selfie friendly
Liveview
Touch display
Viewfinder Information
Viewfinder Electronic Optical (pentaprism)
Viewfinder resolution 2,360k dots -
Viewfinder coverage 100 percent 98 percent
Viewfinder magnification 0.74x 0.85x
Features
Slowest shutter speed 60s 30s
Maximum shutter speed 1/8000s 1/4000s
Maximum quiet shutter speed 1/32000s -
Continuous shooting rate 60.0 frames/s 3.0 frames/s
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation Yes Yes
Custom white balance
Image stabilization
Inbuilt flash
Flash distance 9.10 m (at ISO 100) 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 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
Hot shoe
AE bracketing
White balance bracketing
Maximum flash synchronize 1/250s 1/125s
Exposure
Multisegment
Average
Spot
Partial
AF area
Center weighted
Video features
Supported video resolutions 4096 x 2160 @ 24p / 237 Mbps, MOV, H.264, Linear PCM, 3840 x 2160 @ 30p / 102 Mbps, MOV, H.264, Linear PCM 1920 x 1080 (60i, 50i, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p,24p)
Maximum video resolution 4096x2160 1920x1080
Video file format MOV, H.264 MPEG-4, H.264
Microphone port
Headphone port
Connectivity
Wireless Built-In None
Bluetooth
NFC
HDMI
USB USB 3.0 (5 GBit/sec) USB 3.0 (5 GBit/sec)
GPS None Optional
Physical
Environmental sealing
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 574 grams (1.27 pounds) 1550 grams (3.42 pounds)
Dimensions 134 x 91 x 67mm (5.3" x 3.6" x 2.6") 156 x 117 x 123mm (6.1" x 4.6" x 4.8")
DXO scores
DXO All around rating 80 101
DXO Color Depth rating 23.7 26.0
DXO Dynamic range rating 12.8 14.7
DXO Low light rating 1312 4505
Other
Battery life 350 photos 650 photos
Battery type Battery Pack Battery Pack
Battery ID BLH-1 D-LI90
Self timer Yes (2 or 12 secs, custom) Yes (2 or 10 secs)
Time lapse feature
Storage type Dual SD/SDHC/SDXC slots Dual SD/SDHC/SDXC slots
Card slots Two Two
Retail price $1,700 $5,024