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Olympus E-M5 III vs Pentax K-S1

Portability
80 Imaging
61 Features
88 Overall
71
Olympus OM-D E-M5 III front
 
Pentax K-S1 front
Portability
69 Imaging
63 Features
70 Overall
65

Olympus E-M5 III vs Pentax K-S1 Key Specs

Olympus E-M5 III
(Full Review)
  • 20MP - Four Thirds Sensor
  • 3" Fully Articulated Display
  • ISO 200 - 25600
  • Sensor based 5-axis Image Stabilization
  • 1/8000s Maximum Shutter
  • 4096 x 2160 video
  • Micro Four Thirds Mount
  • 414g - 125 x 85 x 50mm
  • Released October 2019
  • Earlier Model is Olympus E-M5 II
  • Replacement is OM System OM-5
Pentax K-S1
(Full Review)
  • 20MP - APS-C Sensor
  • 3" Fixed Screen
  • ISO 100 - 51200
  • Sensor based Image Stabilization
  • No Anti-Alias Filter
  • 1/6000s Maximum Shutter
  • 1920 x 1080 video
  • Pentax KAF2 Mount
  • 558g - 121 x 93 x 70mm
  • Released August 2014
  • New Model is Pentax K-S2
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Olympus E-M5 III vs Pentax K-S1 Overview

Below, we will be matching up the Olympus E-M5 III and Pentax K-S1, former being a Advanced Mirrorless while the latter is a Advanced DSLR by rivals Olympus and Pentax. The sensor resolution of the E-M5 III (20MP) and the K-S1 (20MP) is pretty similar but the E-M5 III (Four Thirds) and K-S1 (APS-C) feature totally different sensor sizes.

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The E-M5 III was manufactured 5 years later than the K-S1 and that is quite a large difference as far as technology is concerned. Both of these cameras come with different body type with the Olympus E-M5 III being a SLR-style mirrorless camera and the Pentax K-S1 being a Mid-size SLR camera.

Before delving straight into a full comparison, below is a concise summation of how the E-M5 III matches up against the K-S1 in regards to portability, imaging, features and an overall rating.

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Reasons to pick Olympus E-M5 III over the Pentax K-S1

		

		

			
 E-M5 III K-S1 
ReleasedOctober 2019August 2014Fresher by 63 months
Screen typeFully ArticulatedFixed Fully Articulating screen
Screen resolution1040k921kClearer screen (+119k dot)
Selfie screen  Easy selfies
Touch screen  Quickly navigate
		

	

	
	

		

		
Reasons to pick Pentax K-S1 over the Olympus E-M5 III

		

		

			
 K-S1 E-M5 III 
		

	

	
	

		

		
Common features in the Olympus E-M5 III and Pentax K-S1

		

		

			
 E-M5 III K-S1 
Focus manually  Dial exact focusing
Screen dimension3"3"Identical screen dimensions
		

	

	

	
	
	
	

	

		

		
Olympus E-M5 III vs Pentax K-S1 Physical Comparison

		

		

			
When you are intending to carry your camera frequently, you're going to have to factor in its weight and measurements. The Olympus E-M5 III features physical measurements of 125mm x 85mm x 50mm (4.9" x 3.3" x 2.0") with a weight of 414 grams (0.91 lbs) and the Pentax K-S1 has proportions of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") having a weight of 558 grams (1.23 lbs).
Check out the Olympus E-M5 III and Pentax K-S1 in our newest Camera & Lens Size Comparison Tool. Camera Size Comparison with Lenses
Don't forget, the weight of an ILC will change depending on the lens you have during that time. Following is the front view physical size comparison of the E-M5 III and the K-S1.
Olympus E-M5 III vs Pentax K-S1 size comparison
Looking at dimensions and weight, the portability grade of the E-M5 III and K-S1 is 80 and 69 respectively.
Olympus E-M5 III vs Pentax K-S1 top view buttons comparison		

	

	
	

		

		
Olympus E-M5 III vs Pentax K-S1 Sensor Comparison

		

		

			
More often than not, it is difficult to envision the difference between sensor sizing only by reviewing specifications. The visual underneath will provide you a far better sense of the sensor measurements in the E-M5 III and K-S1.
Plainly, the 2 cameras posses the exact same megapixel count albeit not the same sensor sizing. The E-M5 III provides the tinier sensor which should make achieving shallow DOF harder. The newer E-M5 III will have a benefit when it comes to sensor tech.
	
			Olympus E-M5 III vs Pentax K-S1 sensor size comparison			
		

	

	
	

		

		
Olympus E-M5 III vs Pentax K-S1 Screen and ViewFinder

		

		

					

		Olympus E-M5 III vs Pentax K-S1 Screen and Viewfinder comparison	

	
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Photography Type Scores

		

	

	
Portrait Comparison
Olympus E-M5 III Portrait photography factors
Pentax K-S1 Portrait photography factors
76
 you can focus manually
 MP count good (20 megapixels)
 nice sensor size (Four Thirds)
 comes with face detect autofocus
 delivers RAW formats
77
 you can focus manually
 MP count good (20 megapixels)
 good sensor size (APS-C)
 comes with face detection autofocus
 saves RAW formats
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Street Comparison
Olympus E-M5 III Street photography details
Pentax K-S1 Street photography details
83
 screen can move to multiple angles
 built in image stabilization (Sensor based 5-axis)
 nice sensor size (Four Thirds)
 delivers RAW formats
 boasts focus by touch
 environment sealing
 good ISO range (25,600)
73
 has image stabilization (Sensor based)
 good sensor size (APS-C)
 saves RAW formats
 lighter than competition (558 grams)
 above average ISO range (51,200)
 no moving screen
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Sports Comparison
 Olympus E-M5 III as a Sports photography camera
 Pentax K-S1 as a Sports photography camera
75
 max shutter speed is good (1/8,000s)
 quiet shooting (1/32,000s)
 max frames per second high (30.0 fps)
 built in image stabilization (Sensor based 5-axis)
 MP count good (20MP)
 nice sensor size (Four Thirds)
 comes with tracking focus
 environment sealing
 sensor has phase detect autofocus
 terrible battery life (310 shots)
69
 maximum shutter speed is high (1/6,000 seconds)
 has image stabilization (Sensor based)
 MP count good (20MP)
 good sensor size (APS-C)
 comes with tracking autofocus
 comes with phase detect autofocus
 slow continuous shooting (5.4 frames/s)
 terrible battery (410 shots)
Photography Glossary
Travel Comparison
Olympus E-M5 III Travel photography details
Pentax K-S1 Travel photography details
77
 environment sealing
 has bluetooth
 boasts focus by touch
 MP count good (20MP)
 selfie friendly display
 terrible battery life (310 shots)
60
 lighter than competition (558g)
 MP count good (20 megapixels)
 has built in flash
 lack of Timelapse function
 terrible battery (410 shots)
 display is not selfie friendly
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Landscape Comparison
Olympus E-M5 III Landscape photography factors
Pentax K-S1 Landscape photography factors
77
 you can focus manually
 interchangeable lenses (Micro Four Thirds mount)
 screen size is good (3")
 built in image stabilization (Sensor based 5-axis)
 MP count good (20MP)
 nice sensor size (Four Thirds)
 good ISO range (25,600)
 delivers RAW formats
 environment sealing
 terrible battery life (310 shots)
73
 you can focus manually
 interchangeable lenses (Pentax KAF2 mount)
 good sized screen (3 inches)
 has image stabilization (Sensor based)
 MP count good (20 megapixels)
 good sensor size (APS-C)
 does not have low pass filter
 above average ISO range (51,200)
 saves RAW formats
 terrible battery (410 shots)
 lack of Timelapse function
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Vlogging Comparison
Olympus E-M5 III Vlogging info
Pentax K-S1 Vlogging info
84
 selfie friendly display
 touchscreen functionality
 built in image stabilization (Sensor based 5-axis)
 comes with face detect autofocus
 high quality video (4096 x 2160 pxls)
 includes mic jack
33
 has image stabilization (Sensor based)
 comes with face detection autofocus
 video resolution high (1920 x 1080 resolution)
 lighter than competition (558g)
 display is not selfie friendly
 lack of external microphone socket
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Olympus E-M5 III vs Pentax K-S1 Specifications

		

		

					

		
		

			Detailed spec comparison table for Olympus E-M5 III and Pentax K-S1
 Olympus OM-D E-M5 IIIPentax K-S1
General Information
Make Olympus Pentax
Model type Olympus OM-D E-M5 III Pentax K-S1
Type Advanced Mirrorless Advanced DSLR
Released 2019-10-17 2014-08-27
Physical type SLR-style mirrorless Mid-size SLR
Sensor Information
Powered by TruePic VIII Prime MII
Sensor type MOS CMOS
Sensor size Four Thirds APS-C
Sensor measurements 17.4 x 13mm 23.5 x 15.6mm
Sensor surface area 226.2mm² 366.6mm²
Sensor resolution 20 megapixel 20 megapixel
Anti alias filter    
Aspect ratio 1:1, 4:3, 3:2 and  16:9 3:2
Highest resolution 5184 x 3888 5472 x 3648
Highest native ISO 25600 51200
Min native ISO 200 100
RAW data    
Min boosted ISO 64 -
Autofocusing
Focus manually    
Autofocus touch    
Autofocus continuous    
Single autofocus    
Autofocus tracking    
Selective autofocus    
Center weighted autofocus    
Multi area autofocus    
Autofocus live view    
Face detect focus    
Contract detect focus    
Phase detect focus    
Total focus points 121 11
Lens
Lens mount type Micro Four Thirds Pentax KAF2
Number of lenses 107 151
Focal length multiplier 2.1 1.5
Screen
Display type Fully Articulated Fixed Type
Display sizing 3 inch 3 inch
Resolution of display 1,040k dots 921k dots
Selfie friendly    
Liveview    
Touch screen    
Viewfinder Information
Viewfinder Electronic Optical (pentaprism)
Viewfinder resolution 2,360k dots -
Viewfinder coverage 100 percent 100 percent
Viewfinder magnification 0.68x 0.64x
Features
Slowest shutter speed 60 seconds 30 seconds
Maximum shutter speed 1/8000 seconds 1/6000 seconds
Maximum quiet shutter speed 1/32000 seconds -
Continuous shooting rate 30.0 frames/s 5.4 frames/s
Shutter priority    
Aperture priority    
Manual mode    
Exposure compensation Yes Yes
Change white balance    
Image stabilization    
Integrated flash    
Flash distance no built-in flash 10.00 m (at ISO 100)
Flash settings Auto, redeye, fill, off, redeye slow sync, slow sync, 2nd-curtain slow sync, manual Auto, auto + redeye, on, on + redeye reduction, slow sync, trailing curtain sync, manual
Hot shoe    
Auto exposure bracketing    
WB bracketing    
Maximum flash synchronize 1/250 seconds -
Exposure
Multisegment exposure    
Average exposure    
Spot exposure    
Partial exposure    
AF area exposure    
Center weighted exposure    
Video features
Video resolutions 4096 x 2160 @ 24p / 237 Mbps, MOV, H.264, Linear PCM 1920 x 1080 (30,25,24 fps), 1280 x 720 (60,50 fps)
Highest video resolution 4096x2160 1920x1080
Video format MPEG-4, H.264 H.264
Microphone port    
Headphone port    
Connectivity
Wireless Built-In Eye-Fi Connected
Bluetooth    
NFC    
HDMI    
USB USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec)
GPS None Optional
Physical
Environmental sealing    
Water proofing    
Dust proofing    
Shock proofing    
Crush proofing    
Freeze proofing    
Weight 414g (0.91 lb) 558g (1.23 lb)
Dimensions 125 x 85 x 50mm (4.9" x 3.3" x 2.0") 121 x 93 x 70mm (4.8" x 3.7" x 2.8")
DXO scores
DXO All around rating not tested 78
DXO Color Depth rating not tested 23.5
DXO Dynamic range rating not tested 13.0
DXO Low light rating not tested 1061
Other
Battery life 310 shots 410 shots
Battery type Battery Pack Battery Pack
Battery ID BLN-1 D-LI109
Self timer Yes (2 or 10 secs, custom) Yes ( 2 or 12 seconds)
Time lapse feature    
Type of storage SD/SDHC/SDXC (UHS-II supported) SD/SDHC/SDXC
Card slots Single Single
Price at launch $1,199 $339