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Pentax K-3 III vs Sony A9 II

Portability
58
Imaging
72
Features
86
Overall
77
Pentax K-3 Mark III front
 
Sony Alpha A9 Mark II front
Portability
62
Imaging
76
Features
93
Overall
82

Pentax K-3 III vs Sony A9 II Key Specs

Pentax K-3 III
(Full Review)
  • 26MP - APS-C Sensor
  • 3.2" Fixed Screen
  • ISO 100 - 1600000
  • Sensor based Image Stabilization
  • No Anti-Alias Filter
  • 1/8000s Max Shutter
  • 3840 x 2160 video
  • Pentax KAF2 Mount
  • 820g - 135 x 104 x 74mm
  • Introduced March 2021
Sony A9 II
(Full Review)
  • 24MP - Full frame Sensor
  • 3" Tilting Display
  • ISO 100 - 51200 (Bump to 204800)
  • Sensor based 5-axis Image Stabilization
  • 1/8000s Maximum Shutter
  • 3840 x 2160 video
  • Sony E Mount
  • 678g - 129 x 96 x 76mm
  • Revealed October 2019
  • Previous Model is Sony A9
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Pentax K-3 III vs Sony A9 II Overview

Lets look a little more in depth at the Pentax K-3 III and Sony A9 II, former is a Advanced DSLR while the other is a Pro Mirrorless by rivals Pentax and Sony. The resolution of the K-3 III (26MP) and the A9 II (24MP) is very comparable but the K-3 III (APS-C) and A9 II (Full frame) boast totally different sensor dimensions.

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The K-3 III was announced 19 months after the A9 II making them a generation away from one another. Each of these cameras have different body design with the Pentax K-3 III being a Mid-size SLR camera and the Sony A9 II being a SLR-style mirrorless camera.

Before diving straight to a comprehensive comparison, here is a concise synopsis of how the K-3 III grades against the A9 II with regard to portability, imaging, features and an overall mark.

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Reasons to pick Pentax K-3 III over the Sony A9 II

 K-3 III A9 II 
RevealedMarch 2021October 2019Newer by 19 months
Display dimensions3.2"3"Larger display (+0.2")
Display resolution1620k1440kCrisper display (+180k dot)

Reasons to pick Sony A9 II over the Pentax K-3 III

 A9 II K-3 III 
Display typeTiltingFixed Tilting display

Common features in the Pentax K-3 III and Sony A9 II

 K-3 III A9 II 
Focus manually More precise focus
Selfie screen Neither has selfie screen
Touch display Easily navigate

Pentax K-3 III vs Sony A9 II Physical Comparison

For anybody who is planning to travel with your camera regularly, you should factor in its weight and volume. The Pentax K-3 III has outer dimensions of 135mm x 104mm x 74mm (5.3" x 4.1" x 2.9") along with a weight of 820 grams (1.81 lbs) while the Sony A9 II has sizing of 129mm x 96mm x 76mm (5.1" x 3.8" x 3.0") with a weight of 678 grams (1.49 lbs).

Examine the Pentax K-3 III and Sony A9 II in our completely new Camera plus Lens Size Comparison Tool. Camera Size Comparison with Lenses

Take into consideration, the weight of an ILC will vary based on the lens you use at that moment. The following is a front view size comparison of the K-3 III and the A9 II.

Pentax K-3 III vs Sony A9 II size comparison

Looking at dimensions and weight, the portability score of the K-3 III and A9 II is 58 and 62 respectively.

Pentax K-3 III vs Sony A9 II top view buttons comparison

Pentax K-3 III vs Sony A9 II Sensor Comparison

Normally, its difficult to envision the difference in sensor dimensions merely by checking out specifications. The image here will give you a far better sense of the sensor sizes in the K-3 III and A9 II.

Plainly, both of those cameras provide different megapixel count and different sensor dimensions. The K-3 III having a smaller sensor will make getting shallow depth of field harder and the Pentax K-3 III will produce extra detail with its extra 2MP. Greater resolution will also allow you to crop pics more aggressively. The fresher K-3 III is going to have an advantage when it comes to sensor tech.

Pentax K-3 III vs Sony A9 II sensor size comparison

Pentax K-3 III vs Sony A9 II Screen and ViewFinder

Pentax K-3 III vs Sony A9 II Screen and Viewfinder comparison
Photography Glossary

Photography Type Scores

Portrait Comparison

Portrait photography with Pentax K-3 III
Portrait photography with Sony A9 II
83
you can focus manually
great sensor resolution (26MP)
nice sensor size (APS-C)
comes with face detection focusing
delivers RAW formats
85
focusing manually
decent MP (24 megapixels)
large sensor size (Full frame)
includes face detection focusing
delivers RAW formats
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Street Comparison

Street photography with Pentax K-3 III
Street photography with Sony A9 II
71
image stabilization (Sensor based)
nice sensor size (APS-C)
delivers RAW formats
offers touch focus
weather proof
above average ISO range (1,600,000)
screen does not articulate
78
screen tilts
image stabilization (Sensor based 5-axis)
large sensor size (Full frame)
delivers RAW formats
offers focus via touch
weather proofing
good high ISO (51,200)
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Sports Comparison

Pentax K-3 III Sports photography factors
Sony A9 II Sports photography factors
79
great max shutter speed (1/8,000 seconds)
image stabilization (Sensor based)
great sensor resolution (26 megapixels)
nice sensor size (APS-C)
comes with tracking autofocus
weather proof
sensor has phase detect AF
not so great battery life (800 shots)
88
max shutter speed is good (1/8,000 seconds)
silent shutter (1/32,000 seconds)
max frames per second high (20.0 frames/s)
image stabilization (Sensor based 5-axis)
decent MP (24MP)
large sensor size (Full frame)
includes tracking autofocus
weather proofing
good battery life (690 CIPA)
sensor has phase detect AF
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Travel Comparison

Travel photography with Pentax K-3 III
Travel photography with Sony A9 II
64
weather proof
supports bluetooth
offers touch focus
great sensor resolution (26 megapixels)
not so great battery life (800 per charge)
does not posses selfie friendly screen
73
good battery life (690 CIPA)
weather proofing
connects via bluetooth
offers focus via touch
decent MP (24 megapixels)
screen is not selfie friendly
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Landscape Comparison

Pentax K-3 III Landscape photography advice
Sony A9 II Landscape photography advice
80
you can focus manually
swap lenses (Pentax KAF2 mount)
screen size is decent (3.2")
image stabilization (Sensor based)
great sensor resolution (26 megapixels)
nice sensor size (APS-C)
no anti-alias filter
above average ISO range (1,600,000)
delivers RAW formats
weather proof
two card slots
not so great battery life (800 per charge)
86
focusing manually
change lenses (Sony E mount)
screen is a decent size (3 inch)
image stabilization (Sensor based 5-axis)
decent MP (24 megapixels)
large sensor size (Full frame)
good high ISO (51,200)
delivers RAW formats
weather proofing
good battery life (690 shots)
has dual storage slots
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Vlogging Comparison

Vlogging with Pentax K-3 III
Vlogging with Sony A9 II
35
touchscreen capability
image stabilization (Sensor based)
comes with face detection focusing
high quality video (3840 x 2160 resolution)
includes external microphone socket
does not posses selfie friendly screen
36
touchscreen capability
image stabilization (Sensor based 5-axis)
includes face detection focusing
video res high (3840 x 2160 resolution)
includes external microphone jack
screen is not selfie friendly
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Pentax K-3 III vs Sony A9 II Specifications

Detailed spec comparison table for Pentax K-3 III and Sony A9 II
 Pentax K-3 Mark IIISony Alpha A9 Mark II
General Information
Make Pentax Sony
Model type Pentax K-3 Mark III Sony Alpha A9 Mark II
Class Advanced DSLR Pro Mirrorless
Introduced 2021-03-31 2019-10-03
Body design Mid-size SLR SLR-style mirrorless
Sensor Information
Powered by - BIONZ X
Sensor type CMOS BSI-CMOS
Sensor size APS-C Full frame
Sensor measurements 23 x 15.5mm 35.6 x 23.8mm
Sensor surface area 356.5mm² 847.3mm²
Sensor resolution 26 megapixels 24 megapixels
Anti alias filter
Aspect ratio 3:2 3:2
Max resolution 6192 x 4128 6000 x 4000
Max native ISO 1600000 51200
Max enhanced ISO - 204800
Min native ISO 100 100
RAW photos
Min enhanced ISO - 50
Autofocusing
Focus manually
Touch focus
Continuous AF
AF single
Tracking AF
AF selectice
AF center weighted
AF multi area
Live view AF
Face detection focusing
Contract detection focusing
Phase detection focusing
Total focus points 101 693
Cross type focus points 25 -
Lens
Lens support Pentax KAF2 Sony E
Number of lenses 156 121
Crop factor 1.6 1
Screen
Screen type Fixed Type Tilting
Screen sizing 3.2 inches 3 inches
Screen resolution 1,620 thousand dot 1,440 thousand dot
Selfie friendly
Liveview
Touch display
Viewfinder Information
Viewfinder Optical (pentaprism) Electronic
Viewfinder resolution - 3,686 thousand dot
Viewfinder coverage 100% 100%
Viewfinder magnification 0.7x 0.78x
Features
Minimum shutter speed 30 seconds 30 seconds
Fastest shutter speed 1/8000 seconds 1/8000 seconds
Fastest silent shutter speed - 1/32000 seconds
Continuous shutter speed 12.0 frames per sec 20.0 frames per sec
Shutter priority
Aperture priority
Expose Manually
Exposure compensation Yes Yes
Set WB
Image stabilization
Inbuilt flash
Flash distance no built-in flash no built-in flash
Flash modes Auto, Auto + Red-eye Reduction, Flash On, Flash On + Red-eye Reduction, Slow- speed Sync, Slow-speed Sync + Red-eye, P-TTL, Contrast-control-sync, High-speed sync, Wireless sync Flash off, Autoflash, Fill-flash, Slow Sync., Rear Sync., Red-eye reduction, Wireless, Hi-speed sync
Hot shoe
Auto exposure bracketing
White balance bracketing
Fastest flash sync 1/200 seconds -
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
Video features
Video resolutions 3840 x 2160 @ 30p, MOV, H.264, Linear PCM3840 x 2160 @ 24p, MOV, H.264, Linear PCM1920 x 1080 @ 60p, MOV, H.264, Linear PCM1920 x 1080 @ 30p, MOV, H.264, Linear PCM1920 x 1080 @ 24p, MOV, H.264, Linear PCM 3840 x 2160 @ 30p / 100 Mbps, XAVC S, MP4, H.264, Linear PCM
Max video resolution 3840x2160 3840x2160
Video data format MPEG-4, H.264 MPEG-4, AVCHD, H.264
Microphone input
Headphone input
Connectivity
Wireless Built-In Built-In
Bluetooth
NFC
HDMI
USB USB 3.2 Gen 1 (5 GBit/sec) USB 3.1 Gen 1 (5 GBit/sec)
GPS None None
Physical
Environment seal
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 820 gr (1.81 lb) 678 gr (1.49 lb)
Physical dimensions 135 x 104 x 74mm (5.3" x 4.1" x 2.9") 129 x 96 x 76mm (5.1" x 3.8" x 3.0")
DXO scores
DXO Overall rating not tested not tested
DXO Color Depth rating not tested not tested
DXO Dynamic range rating not tested not tested
DXO Low light rating not tested not tested
Other
Battery life 800 photos 690 photos
Battery format Battery Pack Battery Pack
Battery ID D-LI90 NP-FZ100
Self timer Yes Yes (2, 5, 10 secs + continuous, 3 or 5 frames)
Time lapse shooting
Type of storage Dual SD/SDHC/SDXC slots (UHS-II supported in slot 1) Dual SD/SDHC/SDXC slots (UHS-II compatible)
Storage slots Two Two
Price at release $1,999 $4,498