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Olympus E-M1 vs Pentax 645D

Portability
71
Imaging
53
Features
85
Overall
65
Olympus OM-D E-M1 front
 
Pentax 645D front
Portability
50
Imaging
76
Features
52
Overall
66

Olympus E-M1 vs Pentax 645D Key Specs

Olympus E-M1
(Full Review)
  • 16MP - Four Thirds Sensor
  • 3" Tilting Screen
  • ISO 100 - 25600
  • Sensor based 5-axis Image Stabilization
  • 1/8000s Max Shutter
  • 1920 x 1080 video
  • Micro Four Thirds Mount
  • 497g - 130 x 94 x 63mm
  • Revealed October 2013
  • Refreshed by 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
  • Announced March 2010
  • Successor is Pentax 645Z
Photography Glossary

Olympus E-M1 vs Pentax 645D Overview

Its time to look a bit more closely at the Olympus E-M1 vs Pentax 645D, one is a Pro Mirrorless and the latter is a Pro DSLR by competitors Olympus and Pentax. There exists a sizeable gap between the resolutions of the E-M1 (16MP) and 645D (40MP) and the E-M1 (Four Thirds) and 645D (Medium format) possess different sensor sizing.

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The E-M1 was revealed 3 years after the 645D which is quite a large gap as far as technology is concerned. Each of these cameras offer different body type with the Olympus E-M1 being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before delving straight into a step-by-step comparison, below is a short introduction of how the E-M1 scores vs the 645D with regards to portability, imaging, features and an overall score.

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

 E-M1 645D 
AnnouncedOctober 2013March 2010More modern by 45 months
Screen typeTiltingFixed Tilting screen
Screen resolution1037k921kCrisper screen (+116k dot)
Touch friendly screen Quickly navigate

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

 645D E-M1 

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

 E-M1 645D 
Manually focus More exact focus
Screen sizing3"3"Equivalent screen measurement
Selfie screen Neither includes selfie screen

Olympus E-M1 vs Pentax 645D Physical Comparison

For anybody who is going to carry around your camera, you're going to have to think about its weight and dimensions. The Olympus E-M1 features external measurements of 130mm x 94mm x 63mm (5.1" x 3.7" x 2.5") having a weight of 497 grams (1.10 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).

Check the Olympus E-M1 vs Pentax 645D in the all new Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses

Bear in mind, the weight of an Interchangeable Lens Camera will change based on the lens you have attached during that time. The following is the front view scale comparison of the E-M1 versus the 645D.

Olympus E-M1 vs Pentax 645D size comparison

Taking into account dimensions and weight, the portability rating of the E-M1 and 645D is 71 and 50 respectively.

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

Olympus E-M1 vs Pentax 645D Sensor Comparison

Typically, it's tough to imagine the gap between sensor sizes merely by going over a spec sheet. The picture underneath will help offer you a more clear sense of the sensor measurements in the E-M1 and 645D.

Clearly, both of these cameras offer different megapixel count and different sensor sizes. The E-M1 using its tinier sensor is going to make shooting shallower DOF more challenging and the Pentax 645D will deliver extra detail because of its extra 24MP. Higher resolution will also let you crop photographs a little more aggressively. The fresher E-M1 provides an edge with regard to sensor innovation.

Olympus E-M1 vs Pentax 645D sensor size comparison

Olympus E-M1 vs Pentax 645D Screen and ViewFinder

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

Portrait Comparison

Olympus E-M1 Portrait photography info
Pentax 645D Portrait photography info
71
you can focus manually
great flash sync speed (1/320 seconds)
good resolution (16MP)
nice sensor size (Four Thirds)
supports face detect autofocus
saves RAW formats
77
you can focus manually
megapixel count high (40MP)
large sensor size (Medium format)
exports RAW formats
no liveview
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Street Comparison

Street photography with Olympus E-M1
Street photography with Pentax 645D
78
screen tilts up and down
has image stabilization (Sensor based 5-axis)
nice sensor size (Four Thirds)
saves RAW formats
includes touch to focus
environment sealing
lighter than average (497 grams)
great ISO range (25,600)
58
large sensor size (Medium format)
exports RAW formats
weather sealing
screen does not articulate
lack of image stabilization
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Sports Comparison

Olympus E-M1 Sports photography details
Pentax 645D Sports photography details
70
great max shutter speed (1/8,000 seconds)
has image stabilization (Sensor based 5-axis)
good resolution (16 megapixels)
nice sensor size (Four Thirds)
supports tracking focus
environment sealing
has phase detect autofocus
not so great battery (350 CIPA)
63
megapixel count high (40MP)
large sensor size (Medium format)
weather sealing
sensor has phase detect autofocus
no liveview
low frames per second (1.0 frames per second)
lack of image stabilization
low battery power (800 per charge)
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Travel Comparison

Travel photography with Olympus E-M1
Travel photography with Pentax 645D
65
lighter than average (497 grams)
environment sealing
includes touch to focus
good resolution (16 megapixels)
not so great battery (350 per charge)
display is not selfie friendly
55
weather sealing
megapixel count high (40 megapixels)
low battery power (800 shots)
doesn't posses selfie friendly screen
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Landscape Comparison

Landscape photography with Olympus E-M1
Landscape photography with Pentax 645D
73
you can focus manually
interchangeable lenses (Micro Four Thirds mount)
screen size is good (3 inches)
has image stabilization (Sensor based 5-axis)
good resolution (16 megapixels)
nice sensor size (Four Thirds)
great ISO range (25,600)
saves RAW formats
environment sealing
not so great battery (350 per charge)
72
you can focus manually
swap lenses (Pentax 645AF2 mount)
decent sized screen (3 inches)
megapixel count high (40 megapixels)
large sensor size (Medium format)
no anti-alias filter
exports RAW formats
weather sealing
2 card slots
no liveview
lack of image stabilization
low battery power (800 CIPA)
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Vlogging Comparison

Olympus E-M1 as a Vlogging camera
Pentax 645D as a Vlogging camera
36
touchscreen capability
has image stabilization (Sensor based 5-axis)
supports face detect autofocus
video res high (1920 x 1080 resolution)
has microphone support
lighter than average (497g)
display is not selfie friendly
9
no video recording
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Olympus E-M1 vs Pentax 645D Specifications

Detailed spec comparison table for Olympus E-M1 and Pentax 645D
 Olympus OM-D E-M1Pentax 645D
General Information
Make Olympus Pentax
Model type Olympus OM-D E-M1 Pentax 645D
Category Pro Mirrorless Pro DSLR
Revealed 2013-10-28 2010-03-10
Physical type SLR-style mirrorless Large SLR
Sensor Information
Powered by TruePIC VII Prime II
Sensor type CMOS CCD
Sensor size Four Thirds Medium format
Sensor measurements 17.3 x 13mm 44 x 33mm
Sensor 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
Maximum resolution 4608 x 3456 7264 x 5440
Maximum native ISO 25600 1600
Minimum native ISO 100 200
RAW support
Minimum boosted ISO - 100
Autofocusing
Manual focusing
Touch to focus
Continuous autofocus
Single autofocus
Tracking autofocus
Selective autofocus
Center weighted autofocus
Autofocus multi area
Autofocus live view
Face detection autofocus
Contract detection autofocus
Phase detection autofocus
Total focus points 81 11
Lens
Lens support Micro Four Thirds Pentax 645AF2
Number of lenses 107 6
Crop factor 2.1 0.8
Screen
Screen type Tilting Fixed Type
Screen size 3 inches 3 inches
Screen resolution 1,037 thousand dots 921 thousand dots
Selfie friendly
Liveview
Touch screen
Screen tech - TFT Color LCD with wide-viewing angle and with AR coating
Viewfinder Information
Viewfinder type Electronic Optical (pentaprism)
Viewfinder resolution 2,360 thousand dots -
Viewfinder coverage 100% 98%
Viewfinder magnification 0.74x 0.85x
Features
Lowest shutter speed 60 secs 30 secs
Highest shutter speed 1/8000 secs 1/4000 secs
Continuous shooting rate 10.0fps 1.0fps
Shutter priority
Aperture priority
Manual mode
Exposure compensation Yes Yes
Custom white balance
Image stabilization
Built-in flash
Flash distance no built-in flash no built-in flash
Flash modes Flash Auto, 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
Highest flash synchronize 1/320 secs 1/125 secs
Exposure
Multisegment
Average
Spot
Partial
AF area
Center weighted
Video features
Supported video resolutions 1920 x 1080 (30 fps), 1280 x 720 (30 fps), 640 x 480 (30 fps) -
Maximum video resolution 1920x1080 None
Video data format H.264, Motion JPEG -
Microphone support
Headphone support
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 proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 497 gr (1.10 lb) 1480 gr (3.26 lb)
Dimensions 130 x 94 x 63mm (5.1" x 3.7" x 2.5") 156 x 117 x 119mm (6.1" x 4.6" x 4.7")
DXO scores
DXO All around rating 73 82
DXO Color Depth rating 23.0 24.6
DXO Dynamic range rating 12.7 12.6
DXO Low light rating 757 1262
Other
Battery life 350 pictures 800 pictures
Form of battery Battery Pack Battery Pack
Battery ID BLN-1 D-LI90
Self timer Yes (2 or 12 secs, custom) Yes (2 or 10 sec)
Time lapse recording
Storage type SD/SDHC/SDXC SD/SDHC
Card slots One 2
Launch pricing $799 $4,000