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Pentax K-S1 vs Sony A77 II

Portability
69 Imaging
64 Features
70 Overall
66
Pentax K-S1 front
 
Sony SLT-A77 II front
Portability
62 Imaging
66 Features
85 Overall
73

Pentax K-S1 vs Sony A77 II Key Specs

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 Max Shutter
  • 1920 x 1080 video
  • Pentax KAF2 Mount
  • 558g - 121 x 93 x 70mm
  • Revealed August 2014
  • Successor is Pentax K-S2
Sony A77 II
(Full Review)
  • 24MP - APS-C Sensor
  • 3" Fully Articulated Screen
  • ISO 50 - 25600
  • Sensor based Image Stabilization
  • 1/8000s Max Shutter
  • 1920 x 1080 video
  • Sony/Minolta Alpha Mount
  • 647g - 143 x 104 x 81mm
  • Released May 2014
  • Previous Model is Sony A77
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Pentax K-S1 vs Sony A77 II Overview

Below, we will be analyzing the Pentax K-S1 and Sony A77 II, both Advanced DSLR digital cameras by competitors Pentax and Sony. The resolution of the K-S1 (20MP) and the A77 II (24MP) is relatively similar and they possess the exact same sensor sizes (APS-C).

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The K-S1 was introduced 4 months after the A77 II so they are of a similar generation. Each of these cameras come with the identical body type (Mid-size SLR).

Before diving in to a in depth comparison, below is a simple summary of how the K-S1 grades versus the A77 II with regard to portability, imaging, features and an overall mark.

Photography Glossary 
	
	

		

		
Reasons to pick Pentax K-S1 over the Sony A77 II

		

		

			
 K-S1 A77 II 
		

	

	
	

		

		
Reasons to pick Sony A77 II over the Pentax K-S1

		

		

			
 A77 II K-S1 
Screen typeFully ArticulatedFixed Fully Articulating screen
Screen resolution1229k921kCrisper screen (+308k dot)
Selfie screen  Easy selfies
		

	

	
	

		

		
Common features in the Pentax K-S1 and Sony A77 II

		

		

			
 K-S1 A77 II 
ReleasedAugust 2014May 2014Similar generation
Focus manually  Dial precise focus
Screen dimension3"3"Identical screen dimensions
Touch friendly screen  Lack of Touch friendly screen
		

	

	

	
	
	
	

	

		

		
Pentax K-S1 vs Sony A77 II Physical Comparison

		

		

			
For those who are looking to travel with your camera frequently, you will want to take into account its weight and dimensions. The Pentax K-S1 features external dimensions of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") along with a weight of 558 grams (1.23 lbs) and the Sony A77 II has dimensions of 143mm x 104mm x 81mm (5.6" x 4.1" x 3.2") and a weight of 647 grams (1.43 lbs).
See the Pentax K-S1 and Sony A77 II in the latest Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses
Keep in mind, the weight of an Interchangeable Lens Camera will differ dependant on the lens you select at that moment. Below is the front view over all size comparison of the K-S1 compared to the A77 II.
Pentax K-S1 vs Sony A77 II size comparison
Taking into account dimensions and weight, the portability grade of the K-S1 and A77 II is 69 and 62 respectively.
Pentax K-S1 vs Sony A77 II top view buttons comparison		

	

	
	

		

		
Pentax K-S1 vs Sony A77 II Sensor Comparison

		

		

			
Sometimes, it is tough to visualize the difference between sensor dimensions merely by going over specs. The picture underneath will help give you a more clear sense of the sensor sizes in the K-S1 and A77 II.
All in all, both of those cameras posses the exact same sensor measurements albeit different resolution. You should count on the Sony A77 II to offer you extra detail using its extra 4 Megapixels. Higher resolution will allow you to crop shots somewhat more aggressively.
	
			Pentax K-S1 vs Sony A77 II sensor size comparison			
		

	

	
	

		

		
Pentax K-S1 vs Sony A77 II Screen and ViewFinder

		

		

					

		Pentax K-S1 vs Sony A77 II Screen and Viewfinder comparison	

	
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Photography Type Scores

		

	

	
Portrait Comparison
Pentax K-S1 Portrait photography info
Sony A77 II Portrait photography info
78
 manual focus
 megapixel count decent (20 megapixels)
 sensor size is decent (APS-C)
 has face detection autofocus
 delivers RAW files
79
 manual focus
 decent megapixels (24 megapixels)
 decent sensor size (APS-C)
 comes with face detect focus
 saves RAW files
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Street Comparison
Pentax K-S1 Street photography info
Sony A77 II Street photography info
73
 has image stabilization (Sensor based)
 sensor size is decent (APS-C)
 delivers RAW files
 lighter than competition in class (558g)
 good high ISO (51,200)
 screen is fixed
76
 fully articulated screen
 image stabilization (Sensor based)
 decent sensor size (APS-C)
 saves RAW files
 environment sealing
 above average ISO range (25,600)
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Sports Comparison
Pentax K-S1 Sports photography details
Sony A77 II Sports photography details
69
 maximum shutter speed is high (1/6,000 seconds)
 has image stabilization (Sensor based)
 megapixel count decent (20 megapixels)
 sensor size is decent (APS-C)
 has tracking autofocus
 sensor has phase detect autofocus
 very slow continuous shooting (5.4 frames/s)
 low battery life (410 shots)
76
 great max shutter speed (1/8,000 seconds)
 image stabilization (Sensor based)
 decent megapixels (24 megapixels)
 decent sensor size (APS-C)
 comes with tracking focus
 environment sealing
 supports phase detect auto focus
 not so great battery (480 shots)
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Travel Comparison
Pentax K-S1 Travel photography information
Sony A77 II Travel photography information
60
 lighter than competition in class (558 grams)
 megapixel count decent (20MP)
 has built in flash
 missing Timelapse function
 low battery life (410 per charge)
 screen isn't selfie friendly
64
 environment sealing
 decent megapixels (24MP)
 has built in flash
 display is selfie friendly
 no Timelapse function
 not so great battery (480 per charge)
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Landscape Comparison
Pentax K-S1 Landscape photography information
Sony A77 II Landscape photography information
73
 manual focus
 change lenses (Pentax KAF2 mount)
 pretty good screen size (3 inch)
 has image stabilization (Sensor based)
 megapixel count decent (20MP)
 sensor size is decent (APS-C)
 doesnt have low pass filter
 good high ISO (51,200)
 delivers RAW files
 low battery life (410 per charge)
 missing Timelapse function
73
 manual focus
 change lenses (Sony/Minolta Alpha mount)
 screen size is good (3")
 image stabilization (Sensor based)
 decent megapixels (24MP)
 decent sensor size (APS-C)
 above average ISO range (25,600)
 saves RAW files
 environment sealing
 not so great battery (480 CIPA)
 no Timelapse function
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Vlogging Comparison
Pentax K-S1 Vlogging factors
Sony A77 II Vlogging factors
33
 has image stabilization (Sensor based)
 has face detection autofocus
 great video quality (1920 x 1080 resolution)
 lighter than competition in class (558 grams)
 screen isn't selfie friendly
 missing external microphone jack
78
 display is selfie friendly
 image stabilization (Sensor based)
 comes with face detect focus
 great video quality (1920 x 1080 pixels)
 comes with microphone socket
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Pentax K-S1 vs Sony A77 II Specifications

		

		

					

		
		

			Detailed spec comparison table for Pentax K-S1 and Sony A77 II
 Pentax K-S1Sony SLT-A77 II
General Information
Company Pentax Sony
Model Pentax K-S1 Sony SLT-A77 II
Category Advanced DSLR Advanced DSLR
Revealed 2014-08-27 2014-05-21
Physical type Mid-size SLR Mid-size SLR
Sensor Information
Processor Prime MII Bionz X
Sensor type CMOS CMOS
Sensor size APS-C APS-C
Sensor measurements 23.5 x 15.6mm 23.5 x 15.6mm
Sensor surface area 366.6mm² 366.6mm²
Sensor resolution 20 megapixel 24 megapixel
Anti aliasing filter    
Aspect ratio 3:2 3:2 and  16:9
Highest resolution 5472 x 3648 6000 x 4000
Highest native ISO 51200 25600
Lowest native ISO 100 50
RAW support    
Autofocusing
Focus manually    
AF touch    
Continuous AF    
Single AF    
AF tracking    
AF selectice    
Center weighted AF    
AF multi area    
Live view AF    
Face detection focusing    
Contract detection focusing    
Phase detection focusing    
Number of focus points 11 79
Cross focus points - 15
Lens
Lens mount Pentax KAF2 Sony/Minolta Alpha
Available lenses 151 143
Focal length multiplier 1.5 1.5
Screen
Screen type Fixed Type Fully Articulated
Screen sizing 3 inches 3 inches
Resolution of screen 921 thousand dots 1,229 thousand dots
Selfie friendly    
Liveview    
Touch friendly    
Viewfinder Information
Viewfinder Optical (pentaprism) Electronic
Viewfinder resolution - 2,359 thousand dots
Viewfinder coverage 100% 100%
Viewfinder magnification 0.64x 0.73x
Features
Slowest shutter speed 30 seconds 30 seconds
Maximum shutter speed 1/6000 seconds 1/8000 seconds
Continuous shooting rate 5.4fps 12.0fps
Shutter priority    
Aperture priority    
Manually set exposure    
Exposure compensation Yes Yes
Change WB    
Image stabilization    
Built-in flash    
Flash range 10.00 m (at ISO 100) 12.00 m (at ISO 100)
Flash modes Auto, auto + redeye, on, on + redeye reduction, slow sync, trailing curtain sync, manual Auto, fill, rear sync, slow sync
External flash    
AEB    
White balance bracketing    
Maximum flash synchronize - 1/250 seconds
Exposure
Multisegment    
Average    
Spot    
Partial    
AF area    
Center weighted    
Video features
Video resolutions 1920 x 1080 (30,25,24 fps), 1280 x 720 (60,50 fps) 1920 x 1080 (60p, 60i, 30p), 1440 x 1080 (30p), 640 x 480 (30p)
Highest video resolution 1920x1080 1920x1080
Video data format H.264 MPEG-4, AVCHD, XAVC S
Microphone port    
Headphone port    
Connectivity
Wireless Eye-Fi Connected Built-In
Bluetooth    
NFC    
HDMI    
USB USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec)
GPS Optional None
Physical
Environmental sealing    
Water proof    
Dust proof    
Shock proof    
Crush proof    
Freeze proof    
Weight 558 gr (1.23 lbs) 647 gr (1.43 lbs)
Dimensions 121 x 93 x 70mm (4.8" x 3.7" x 2.8") 143 x 104 x 81mm (5.6" x 4.1" x 3.2")
DXO scores
DXO All around score 78 82
DXO Color Depth score 23.5 24.4
DXO Dynamic range score 13.0 13.4
DXO Low light score 1061 1013
Other
Battery life 410 pictures 480 pictures
Style of battery Battery Pack Battery Pack
Battery model D-LI109 NP-FM500H
Self timer Yes ( 2 or 12 seconds) Yes (Yes (2 or 12 sec))
Time lapse feature    
Type of storage SD/SDHC/SDXC SD/ SDHC/SDXC, Memory Stick Pro Duo/ Pro-HG Duo
Card slots One One
Launch pricing $339 $1,198