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Pentax K-3 vs Sony A7c

Portability
59
Imaging
65
Features
85
Overall
73
Pentax K-3 front
 
Sony Alpha A7c front
Portability
78
Imaging
76
Features
88
Overall
80

Pentax K-3 vs Sony A7c Key Specs

Pentax K-3
(Full Review)
  • 24MP - APS-C Sensor
  • 3.2" Fixed Screen
  • ISO 100 - 51200
  • Sensor based Image Stabilization
  • No Anti-Alias Filter
  • 1/8000s Maximum Shutter
  • 1920 x 1080 video
  • Pentax KAF2 Mount
  • 800g - 131 x 100 x 77mm
  • Announced April 2014
  • Refreshed by Pentax K-3 II
Sony A7c
(Full Review)
  • 24MP - Full frame Sensor
  • 3" Fully Articulated Screen
  • ISO 100 - 51200 (Raise to 204800)
  • Sensor based 5-axis Image Stabilization
  • 3840 x 2160 video
  • Sony E Mount
  • 509g - 124 x 71 x 60mm
  • Released September 2020
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Pentax K-3 vs Sony A7c Overview

The following is a detailed review of the Pentax K-3 vs Sony A7c, former is a Advanced DSLR while the latter is a Advanced Mirrorless by companies Pentax and Sony. The resolution of the K-3 (24MP) and the A7c (24MP) is relatively close but the K-3 (APS-C) and A7c (Full frame) posses different sensor size.

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The K-3 was unveiled 7 years prior to the A7c which is a fairly serious difference as far as camera technology is concerned. Both the cameras feature different body design with the Pentax K-3 being a Mid-size SLR camera and the Sony A7c being a Rangefinder-style mirrorless camera.

Before diving into a thorough comparison, here is a brief introduction of how the K-3 matches up versus the A7c when considering portability, imaging, features and an overall mark.

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Reasons to pick Pentax K-3 over the Sony A7c

 K-3 A7c 
Screen size3.2"3"Bigger screen (+0.2")
Screen resolution1037k922kSharper screen (+115k dot)

Reasons to pick Sony A7c over the Pentax K-3

 A7c K-3 
ReleasedSeptember 2020April 2014Newer by 78 months
Screen typeFully articulatedFixed Fully Articulating screen
Selfie screen Take selfies
Touch screen Quickly navigate

Common features in the Pentax K-3 and Sony A7c

 K-3 A7c 
Manual focus Dial accurate focus

Pentax K-3 vs Sony A7c Physical Comparison

When you are going to travel with your camera frequently, you will have to factor its weight and proportions. The Pentax K-3 features external measurements of 131mm x 100mm x 77mm (5.2" x 3.9" x 3.0") along with a weight of 800 grams (1.76 lbs) whilst the Sony A7c has measurements of 124mm x 71mm x 60mm (4.9" x 2.8" x 2.4") with a weight of 509 grams (1.12 lbs).

See the Pentax K-3 vs Sony A7c 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 dependant on the lens you choose at that moment. The following is a front view measurement comparison of the K-3 and the A7c.

Pentax K-3 vs Sony A7c size comparison

Taking into consideration dimensions and weight, the portability grade of the K-3 and A7c is 59 and 78 respectively.

Pentax K-3 vs Sony A7c top view buttons comparison

Pentax K-3 vs Sony A7c Sensor Comparison

More often than not, its difficult to imagine the contrast in sensor dimensions just by looking through technical specs. The picture underneath may provide you a much better sense of the sensor sizing in the K-3 and A7c.

As you have seen, each of the cameras feature the identical megapixel count albeit different sensor dimensions. The K-3 includes the smaller sensor which should make getting shallower DOF more difficult. The more aged K-3 will be disadvantaged with regard to sensor technology.

Pentax K-3 vs Sony A7c sensor size comparison

Pentax K-3 vs Sony A7c Screen and ViewFinder

Pentax K-3 vs Sony A7c Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Portrait photography with Pentax K-3
Portrait photography with Sony A7c
79
manual focus
megapixel count good (24 megapixels)
sensor size is decent (APS-C)
supports face detect focus
supports RAW formats
78
manual focus
MP count decent (24 megapixels)
sensor size is great (Full frame)
supports face detect focusing
delivers RAW formats
no external flash support
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Street Comparison

Pentax K-3 as a Street photography camera
Sony A7c as a Street photography camera
69
image stabilization (Sensor based)
sensor size is decent (APS-C)
supports RAW formats
weather sealing
good high ISO (51,200)
screen is fixed
85
built in image stabilization (Sensor based 5-axis)
sensor size is great (Full frame)
delivers RAW formats
has touch to focus
environment proofing
good ISO range (51,200)
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Sports Comparison

Sports photography with Pentax K-3
Sports photography with Sony A7c
76
max shutter speed is good (1/8,000 seconds)
image stabilization (Sensor based)
megapixel count good (24MP)
sensor size is decent (APS-C)
supports tracking focus
weather sealing
sensor has phase detect auto focus
terrible battery pack (560 shots)
88
silent shutter (1/8,000 seconds)
built in image stabilization (Sensor based 5-axis)
MP count decent (24MP)
sensor size is great (Full frame)
supports tracking focus
environment proofing
great battery life (740 CIPA)
has phase detect AF
Photography Glossary

Travel Comparison

Pentax K-3 Travel photography features
Sony A7c Travel photography features
60
weather sealing
megapixel count good (24 megapixels)
flash built-in
terrible battery pack (560 CIPA)
display is not selfie friendly
86
great battery life (740 shots)
environment proofing
has bluetooth
has touch to focus
MP count decent (24MP)
selfie friendly screen
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Landscape Comparison

Pentax K-3 Landscape photography factors
Sony A7c Landscape photography factors
77
manual focus
switch lenses (Pentax KAF2 mount)
good sized screen (3.2")
image stabilization (Sensor based)
megapixel count good (24 megapixels)
sensor size is decent (APS-C)
does not have anti-alias filter
good high ISO (51,200)
supports RAW formats
weather sealing
has dual storage slots
terrible battery pack (560 CIPA)
88
manual focus
swap lenses (Sony E mount)
screen size is decent (3 inches)
built in image stabilization (Sensor based 5-axis)
MP count decent (24MP)
sensor size is great (Full frame)
good ISO range (51,200)
delivers RAW formats
environment proofing
great battery life (740 shots)
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Vlogging Comparison

Pentax K-3 Vlogging info
Sony A7c Vlogging info
34
image stabilization (Sensor based)
supports face detect focus
video resolution high (1920 x 1080 resolution)
includes mic jack
display is not selfie friendly
86
selfie friendly screen
touchscreen functionality
built in image stabilization (Sensor based 5-axis)
supports face detect focusing
video res high (3840 x 2160 pixels)
has mic jack
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Pentax K-3 vs Sony A7c Specifications

Detailed spec comparison table for Pentax K-3 and Sony A7c
 Pentax K-3Sony Alpha A7c
General Information
Company Pentax Sony
Model type Pentax K-3 Sony Alpha A7c
Category Advanced DSLR Advanced Mirrorless
Announced 2014-04-10 2020-09-14
Body design Mid-size SLR Rangefinder-style mirrorless
Sensor Information
Processor Prime III -
Sensor type CMOS BSI-CMOS
Sensor size APS-C Full frame
Sensor dimensions 23.5 x 15.6mm 35.8 x 23.8mm
Sensor surface area 366.6mm² 852.0mm²
Sensor resolution 24 megapixel 24 megapixel
Anti alias filter
Aspect ratio 3:2 3:2 and 16:9
Peak resolution 6016 x 4000 6000 x 4000
Highest native ISO 51200 51200
Highest enhanced ISO - 204800
Minimum native ISO 100 100
RAW data
Minimum enhanced ISO - 50
Autofocusing
Focus manually
Autofocus touch
Continuous autofocus
Autofocus single
Autofocus tracking
Autofocus selectice
Center weighted autofocus
Autofocus multi area
Live view autofocus
Face detection focus
Contract detection focus
Phase detection focus
Total focus points 27 693
Cross type focus points 25 -
Lens
Lens mount type Pentax KAF2 Sony E
Available lenses 151 122
Focal length multiplier 1.5 1
Screen
Screen type Fixed Type Fully articulated
Screen sizing 3.2 inches 3 inches
Resolution of screen 1,037k dot 922k dot
Selfie friendly
Liveview
Touch functionality
Screen technology TFT LCD monitor -
Viewfinder Information
Viewfinder Optical (pentaprism) Electronic
Viewfinder resolution - 2,360k dot
Viewfinder coverage 100 percent 100 percent
Viewfinder magnification 0.64x 0.59x
Features
Minimum shutter speed 30s 30s
Fastest shutter speed 1/8000s 1/4000s
Fastest silent shutter speed - 1/8000s
Continuous shutter speed 8.0 frames per second 10.0 frames per second
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation Yes Yes
Change white balance
Image stabilization
Built-in flash
Flash distance 13.00 m (at ISO 100) no built-in flash
Flash modes Auto, on, off, red-eye, slow sync, slow sync + red-eye, trailing curtain sync, high speed, wireless, manual no built-in flash
External flash
Auto exposure bracketing
WB bracketing
Fastest flash sync 1/180s -
Exposure
Multisegment
Average
Spot
Partial
AF area
Center weighted
Video features
Video resolutions 1920 x 1080 (60i, 50i, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p, 24p) 3840 x 2160 @ 30p / 100 Mbps, XAVC S, MP4, H.264, Linear PCM
Highest video resolution 1920x1080 3840x2160
Video file format MPEG-4, H.264 MPEG-4, XAVC S, H.264
Mic input
Headphone input
Connectivity
Wireless None Built-In
Bluetooth
NFC
HDMI
USB USB 3.0 (5 GBit/sec) USB 3.2 Gen 1 (5 GBit/sec)
GPS Optional None
Physical
Environmental seal
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 800 gr (1.76 lb) 509 gr (1.12 lb)
Physical dimensions 131 x 100 x 77mm (5.2" x 3.9" x 3.0") 124 x 71 x 60mm (4.9" x 2.8" x 2.4")
DXO scores
DXO Overall rating 80 not tested
DXO Color Depth rating 23.7 not tested
DXO Dynamic range rating 13.4 not tested
DXO Low light rating 1216 not tested
Other
Battery life 560 shots 740 shots
Type of battery Battery Pack Battery Pack
Battery ID D-LI90 NP-FZ100
Self timer Yes ( 2 or 12 seconds) Yes (2 or 10 sec; continuous (3 or 5 exposures))
Time lapse recording
Type of storage Dual SD/SDHC/SDXC SD/SDHC/SDXC card (UHS-II supported)
Storage slots Dual Single
Launch pricing $639 $1,800