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Pentax 645D vs Pentax K-x

Portability
50
Imaging
76
Features
52
Overall
66
Pentax 645D front
 
Pentax K-x front
Portability
69
Imaging
52
Features
47
Overall
50

Pentax 645D vs Pentax K-x Key Specs

Pentax 645D
(Full Review)
  • 40MP - Medium format Sensor
  • 3" Fixed Display
  • ISO 200 - 1600
  • No Anti-Alias Filter
  • No Video
  • Pentax 645AF2 Mount
  • 1480g - 156 x 117 x 119mm
  • Launched March 2010
  • Later Model is Pentax 645Z
Pentax K-x
(Full Review)
  • 12MP - APS-C Sensor
  • 2.7" Fixed Screen
  • ISO 100 - 6400 (Bump to 12800)
  • Sensor based Image Stabilization
  • 1/6000s Maximum Shutter
  • 1280 x 720 video
  • Pentax KAF2 Mount
  • 580g - 123 x 92 x 68mm
  • Announced December 2009
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Pentax 645D vs Pentax K-x Overview

Following is a extended review of the Pentax 645D vs Pentax K-x, former is a Pro DSLR while the latter is a Entry-Level DSLR and both of them are created by Pentax. There is a large difference among the resolutions of the 645D (40MP) and K-x (12MP) and the 645D (Medium format) and K-x (APS-C) posses totally different sensor sizing.

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The 645D was introduced 3 months after the K-x so they are of a similar age. Each of these cameras have different body design with the Pentax 645D being a Large SLR camera and the Pentax K-x being a Compact SLR camera.

Before delving into a complete comparison, here is a quick overview of how the 645D grades versus the K-x for portability, imaging, features and an overall score.

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Reasons to pick Pentax 645D over the Pentax K-x

 645D K-x 
Screen dimensions3"2.7"Bigger screen (+0.3")
Screen resolution921k230kCrisper screen (+691k dot)

Reasons to pick Pentax K-x over the Pentax 645D

 K-x 645D 

Common features in the Pentax 645D and Pentax K-x

 645D K-x 
AnnouncedMarch 2010December 2009Same age
Manually focus Dial exact focus
Screen typeFixed Fixed Fixed screen
Selfie screen Absent selfie screen
Touch friendly screen Absent Touch friendly screen

Pentax 645D vs Pentax K-x Physical Comparison

When you are planning to carry around your camera regularly, you are going to need to factor its weight and proportions. The Pentax 645D has got physical measurements of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") along with a weight of 1480 grams (3.26 lbs) while the Pentax K-x has measurements of 123mm x 92mm x 68mm (4.8" x 3.6" x 2.7") along with a weight of 580 grams (1.28 lbs).

Check out the Pentax 645D vs Pentax K-x in our completely new Camera plus Lens Size Comparison Tool. Camera Size Comparison with Lenses

Bear in mind, the weight of an ILC will change depending on the lens you have at the time. Below is a front view proportions comparison of the 645D compared to the K-x.

Pentax 645D vs Pentax K-x size comparison

Looking at size and weight, the portability score of the 645D and K-x is 50 and 69 respectively.

Pentax 645D vs Pentax K-x top view buttons comparison

Pentax 645D vs Pentax K-x Sensor Comparison

In many cases, it is very hard to visualise the difference in sensor sizes purely by looking through specs. The picture below should give you a much better sense of the sensor sizing in the 645D and K-x.

All in all, each of the cameras have different resolutions and different sensor sizes. The 645D having a bigger sensor will make shooting shallow depth of field easier and the Pentax 645D will provide you with extra detail using its extra 28 Megapixels. Higher resolution can also enable you to crop pictures a bit more aggressively.

Pentax 645D vs Pentax K-x sensor size comparison

Pentax 645D vs Pentax K-x Screen and ViewFinder

Pentax 645D vs Pentax K-x Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Pentax 645D as a Portrait photography camera
Pentax K-x as a Portrait photography camera
77
has manual focus
great MP (40 megapixels)
sensor size is big (Medium format)
exports RAW files
no liveview feature
63
focusing manually
nice sensor size (APS-C)
comes with face detect autofocus
supports RAW files
sensor resolution low (12MP)
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Street Comparison

Pentax 645D Street photography highlights
Pentax K-x Street photography highlights
58
sensor size is big (Medium format)
exports RAW files
environment proofing
no articulating screen
no image stabilization
67
built in image stabilization (Sensor based)
nice sensor size (APS-C)
supports RAW files
screen is fixed
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Sports Comparison

Pentax 645D Sports photography information
Pentax K-x Sports photography information
63
great MP (40MP)
sensor size is big (Medium format)
environment proofing
comes with phase detect AF
no liveview feature
slow fps (1.0 fps)
no image stabilization
low battery power (800 per charge)
61
max shutter speed is good (1/6,000s)
built in image stabilization (Sensor based)
nice sensor size (APS-C)
better than average battery pack (1,900 CIPA)
sensor has phase detect autofocus
max frames per second low (5.0 fps)
sensor resolution low (12 megapixels)
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Travel Comparison

Pentax 645D Travel photography details
Pentax K-x Travel photography details
55
environment proofing
great MP (40MP)
low battery power (800 per charge)
display isn't selfie friendly
54
better than average battery pack (1,900 per charge)
flash built-in
no Time Lapse recording
sensor resolution low (12MP)
display isn't selfie friendly
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Landscape Comparison

Pentax 645D as a Landscape photography camera
Pentax K-x as a Landscape photography camera
72
has manual focus
interchangeable lenses (Pentax 645AF2 mount)
good sized screen (3 inch)
great MP (40MP)
sensor size is big (Medium format)
does not have anti aliasing filter
exports RAW files
environment proofing
has double storage slots
no liveview feature
no image stabilization
low battery power (800 per charge)
61
focusing manually
interchangeable lenses (Pentax KAF2 mount)
built in image stabilization (Sensor based)
nice sensor size (APS-C)
supports RAW files
better than average battery pack (1,900 CIPA)
tiny screen (2.7 inch)
sensor resolution low (12MP)
no Time Lapse recording
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Vlogging Comparison

Vlogging with Pentax 645D
Vlogging with Pentax K-x
9
no video
27
built in image stabilization (Sensor based)
comes with face detect autofocus
display isn't selfie friendly
low res video (1280 x 720 pixels)
no mic support
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Pentax 645D vs Pentax K-x Specifications

Detailed spec comparison table for Pentax 645D and Pentax K-x
 Pentax 645DPentax K-x
General Information
Manufacturer Pentax Pentax
Model Pentax 645D Pentax K-x
Class Pro DSLR Entry-Level DSLR
Launched 2010-03-10 2009-12-23
Physical type Large SLR Compact SLR
Sensor Information
Processor Chip Prime II Prime
Sensor type CCD CMOS
Sensor size Medium format APS-C
Sensor dimensions 44 x 33mm 23.6 x 15.8mm
Sensor surface area 1,452.0mm² 372.9mm²
Sensor resolution 40 megapixel 12 megapixel
Anti aliasing filter
Aspect ratio 4:3 3:2
Peak resolution 7264 x 5440 4288 x 2848
Highest native ISO 1600 6400
Highest enhanced ISO - 12800
Min native ISO 200 100
RAW photos
Min enhanced ISO 100 -
Autofocusing
Focus manually
AF touch
AF continuous
Single AF
AF tracking
AF selectice
AF center weighted
Multi area AF
Live view AF
Face detect focusing
Contract detect focusing
Phase detect focusing
Number of focus points 11 11
Lens
Lens mount Pentax 645AF2 Pentax KAF2
Total lenses 6 151
Focal length multiplier 0.8 1.5
Screen
Display type Fixed Type Fixed Type
Display size 3" 2.7"
Resolution of display 921k dots 230k dots
Selfie friendly
Liveview
Touch capability
Display technology TFT Color LCD with wide-viewing angle and with AR coating TFT LCD monitor
Viewfinder Information
Viewfinder type Optical (pentaprism) Optical (pentamirror)
Viewfinder coverage 98 percent 96 percent
Viewfinder magnification 0.85x 0.57x
Features
Min shutter speed 30 secs 30 secs
Max shutter speed 1/4000 secs 1/6000 secs
Continuous shutter rate 1.0 frames/s 5.0 frames/s
Shutter priority
Aperture priority
Manual mode
Exposure compensation Yes Yes
Custom WB
Image stabilization
Built-in flash
Flash range no built-in flash 16.00 m
Flash settings Auto, On, Off, Red-eye, Slow Sync, Rear Curtain Auto, On, Off, Red-Eye, Slow Sync, Rear curtain, Wireless
Hot shoe
AEB
WB bracketing
Max flash synchronize 1/125 secs 1/180 secs
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
Video features
Video resolutions - 1280 x 720 (24 fps), 640 x 416 (24 fps)
Highest video resolution None 1280x720
Video file format - Motion JPEG
Mic support
Headphone support
Connectivity
Wireless None None
Bluetooth
NFC
HDMI
USB USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec)
GPS None None
Physical
Environmental sealing
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 1480 grams (3.26 pounds) 580 grams (1.28 pounds)
Physical dimensions 156 x 117 x 119mm (6.1" x 4.6" x 4.7") 123 x 92 x 68mm (4.8" x 3.6" x 2.7")
DXO scores
DXO Overall score 82 72
DXO Color Depth score 24.6 22.8
DXO Dynamic range score 12.6 12.5
DXO Low light score 1262 811
Other
Battery life 800 pictures 1900 pictures
Battery style Battery Pack Battery Pack
Battery model D-LI90 4 x AA
Self timer Yes (2 or 10 sec) Yes (2 or 12 sec)
Time lapse recording
Type of storage SD/SDHC SD/SDHC card
Card slots Two Single
Price at release $4,000 $600