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Olympus E-M1 vs Pentax 645Z

Portability
71 Imaging
53 Features
85 Overall
65
Olympus OM-D E-M1 front
 
Pentax 645Z front
Portability
49 Imaging
80 Features
74 Overall
77

Olympus E-M1 vs Pentax 645Z 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 Maximum Shutter
  • 1920 x 1080 video
  • Micro Four Thirds Mount
  • 497g - 130 x 94 x 63mm
  • Released October 2013
  • Newer Model is Olympus E-M1 II
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
  • Announced April 2014
  • Previous Model is Pentax 645D
Photography Glossary

Olympus E-M1 vs Pentax 645Z Overview

Its time to take a deeper look at the Olympus E-M1 versus Pentax 645Z, former is a Pro Mirrorless while the latter is a Pro DSLR by manufacturers Olympus and Pentax. There is a noticeable difference among the resolutions of the E-M1 (16MP) and 645Z (51MP) and the E-M1 (Four Thirds) and 645Z (Medium format) feature different sensor sizes.

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The E-M1 was announced 5 months before the 645Z and they are of a similar age. Each of the cameras offer different body type with the Olympus E-M1 being a SLR-style mirrorless camera and the Pentax 645Z being a Large SLR camera.

Before going in to a comprehensive comparison, below is a simple view of how the E-M1 scores versus the 645Z with regards to portability, imaging, features and an overall mark.

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

		

		

			
 E-M1 645Z 
Touch screen  Quickly navigate
		

	

	
	

		

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

		

		

			
 645Z E-M1 
Screen sizing3.2"3"Bigger screen (+0.2")
		

	

	
	

		

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

		

		

			
 E-M1 645Z 
AnnouncedOctober 2013April 2014Same age
Manual focus  Dial precise focus
Screen typeTiltingTiltingTilting screen
Screen resolution1037k1037kIdentical screen resolution
Selfie screen  Neither provides selfie screen
		

	

	

	
	
	
	

	

		

		
Olympus E-M1 vs Pentax 645Z Physical Comparison

		

		

			
If you're aiming to travel with your camera, you will have to factor in its weight and size. The Olympus E-M1 provides exterior dimensions 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 645Z has specifications of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") having a weight of 1550 grams (3.42 lbs).
See the Olympus E-M1 versus Pentax 645Z in our brand new Camera plus Lens Size Comparison Tool. Camera Size Comparison with Lenses
Keep in mind, the weight of an ILC will vary dependant on the lens you are utilising at that time. Below is the front view proportions comparison of the E-M1 and the 645Z.
Olympus E-M1 vs Pentax 645Z size comparison
Taking into consideration size and weight, the portability grade of the E-M1 and 645Z is 71 and 49 respectively.
Olympus E-M1 vs Pentax 645Z top view buttons comparison		

	

	
	

		

		
Olympus E-M1 vs Pentax 645Z Sensor Comparison

		

		

			
Usually, it is difficult to picture the gap in sensor dimensions only by researching specifications. The pic here should offer you a stronger sense of the sensor sizes in the E-M1 and 645Z.
Plainly, both cameras offer different megapixel count and different sensor dimensions. The E-M1 using its smaller sensor is going to make achieving bokeh more challenging and the Pentax 645Z will result in extra detail with its extra 35 Megapixels. Higher resolution will also enable you to crop shots a little more aggressively.
	
			Olympus E-M1 vs Pentax 645Z sensor size comparison			
		

	

	
	

		

		
Olympus E-M1 vs Pentax 645Z Screen and ViewFinder

		

		

					

		Olympus E-M1 vs Pentax 645Z Screen and Viewfinder comparison	

	
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Photography Type Scores

		

	

	
Portrait Comparison
 Olympus E-M1 as a Portrait photography camera
 Pentax 645Z as a Portrait photography camera
71
 manual focus
 above average flash sync speed (1/320 seconds)
 decent MP (16 megapixels)
 sensor size is decent (Four Thirds)
 has face detection autofocus
 supports RAW files
88
 manual focus
 high megapixels (51 megapixels)
 sensor size is large (Medium format)
 supports face detect focus
 saves RAW formats
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Street Comparison
 Olympus E-M1 as a Street photography camera
 Pentax 645Z as a Street photography camera
78
 tilting screen
 has image stabilization (Sensor based 5-axis)
 sensor size is decent (Four Thirds)
 supports RAW files
 has focus by touch
 environment sealing
 lighter than competition in class (497g)
 very good high ISO (25,600)
63
 screen tilts
 sensor size is large (Medium format)
 saves RAW formats
 weather sealing
 above average high ISO (204,800)
 lack of image stabilization
 heavier than competition (1,550 grams)
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Sports Comparison
Olympus E-M1 Sports photography features
Pentax 645Z Sports photography features
70
 great max shutter speed (1/8,000 seconds)
 has image stabilization (Sensor based 5-axis)
 decent MP (16 megapixels)
 sensor size is decent (Four Thirds)
 has tracking autofocus
 environment sealing
 has phase detect autofocus
 terrible battery pack (350 CIPA)
71
 high megapixels (51 megapixels)
 sensor size is large (Medium format)
 supports tracking focus
 weather sealing
 comes with phase detect auto focus
 continuous shooting slow (3.0 fps)
 lack of image stabilization
 bad battery (650 shots)
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Travel Comparison
Travel photography with Olympus E-M1
Travel photography with Pentax 645Z
65
 lighter than competition in class (497 grams)
 environment sealing
 has focus by touch
 decent MP (16 megapixels)
 terrible battery pack (350 CIPA)
 screen isn't selfie friendly
51
 weather sealing
 high megapixels (51MP)
 bad battery (650 per charge)
 heavier than competition (1,550 grams)
 screen is not selfie friendly
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Landscape Comparison
Landscape photography with Olympus E-M1
Landscape photography with Pentax 645Z
73
 manual focus
 change lenses (Micro Four Thirds mount)
 decent sized screen (3 inches)
 has image stabilization (Sensor based 5-axis)
 decent MP (16MP)
 sensor size is decent (Four Thirds)
 very good high ISO (25,600)
 supports RAW files
 environment sealing
 terrible battery pack (350 shots)
78
 manual focus
 swap lenses (Pentax 645AF2 mount)
 nice screen size (3.2")
 high megapixels (51 megapixels)
 sensor size is large (Medium format)
 no low pass filter
 above average high ISO (204,800)
 saves RAW formats
 weather sealing
 two card slots
 lack of image stabilization
 bad battery (650 shots)
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Vlogging Comparison
Olympus E-M1 Vlogging information
Pentax 645Z Vlogging information
36
 touchscreen
 has image stabilization (Sensor based 5-axis)
 has face detection autofocus
 high video quality (1920 x 1080 pxls)
 has external mic port
 lighter than competition in class (497 grams)
 screen isn't selfie friendly
27
 supports face detect focus
 high video quality (1920 x 1080 pixels)
 does have mic socket
 screen is not selfie friendly
 lack of image stabilization
 heavier than competition (1,550 grams)
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Olympus E-M1 vs Pentax 645Z Specifications

		

		

					

		
		

			Detailed spec comparison table for Olympus E-M1 and Pentax 645Z
 Olympus OM-D E-M1Pentax 645Z
General Information
Company Olympus Pentax
Model type Olympus OM-D E-M1 Pentax 645Z
Type Pro Mirrorless Pro DSLR
Released 2013-10-28 2014-04-15
Physical type SLR-style mirrorless Large SLR
Sensor Information
Processor TruePIC VII PRIME III
Sensor type CMOS CMOS
Sensor size Four Thirds Medium format
Sensor dimensions 17.3 x 13mm 44 x 33mm
Sensor area 224.9mm² 1,452.0mm²
Sensor resolution 16 megapixel 51 megapixel
Anti alias filter    
Aspect ratio 1:1, 4:3, 3:2 and  16:9 4:3
Maximum resolution 4608 x 3456 8256 x 6192
Maximum native ISO 25600 204800
Minimum native ISO 100 100
RAW pictures    
Autofocusing
Manual focusing    
Touch focus    
Continuous AF    
Single AF    
Tracking AF    
Selective AF    
AF center weighted    
AF multi area    
AF live view    
Face detection focusing    
Contract detection focusing    
Phase detection focusing    
Total focus points 81 27
Lens
Lens mount type Micro Four Thirds Pentax 645AF2
Available lenses 107 6
Crop factor 2.1 0.8
Screen
Type of screen Tilting Tilting
Screen size 3 inches 3.2 inches
Resolution of screen 1,037k dots 1,037k dots
Selfie friendly    
Liveview    
Touch friendly    
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 60 secs 30 secs
Maximum shutter speed 1/8000 secs 1/4000 secs
Continuous shooting rate 10.0 frames per second 3.0 frames per second
Shutter priority    
Aperture priority    
Expose Manually    
Exposure compensation Yes Yes
Set WB    
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 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 1/320 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) 1920 x 1080 (60i, 50i, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p,24p)
Maximum video resolution 1920x1080 1920x1080
Video file format H.264, Motion JPEG MPEG-4, H.264
Mic port    
Headphone port    
Connectivity
Wireless Built-In None
Bluetooth    
NFC    
HDMI    
USB USB 2.0 (480 Mbit/sec) USB 3.0 (5 GBit/sec)
GPS None Optional
Physical
Environment sealing    
Water proofing    
Dust proofing    
Shock proofing    
Crush proofing    
Freeze proofing    
Weight 497 gr (1.10 lb) 1550 gr (3.42 lb)
Dimensions 130 x 94 x 63mm (5.1" x 3.7" x 2.5") 156 x 117 x 123mm (6.1" x 4.6" x 4.8")
DXO scores
DXO All around rating 73 101
DXO Color Depth rating 23.0 26.0
DXO Dynamic range rating 12.7 14.7
DXO Low light rating 757 4505
Other
Battery life 350 pictures 650 pictures
Style of battery Battery Pack Battery Pack
Battery ID BLN-1 D-LI90
Self timer Yes (2 or 12 secs, custom) Yes (2 or 10 secs)
Time lapse shooting    
Storage type SD/SDHC/SDXC Dual SD/SDHC/SDXC slots
Card slots One Two
Launch price $799 $5,024