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Pentax 645Z vs Pentax K-x

Portability
49
Imaging
80
Features
74
Overall
77
Pentax 645Z front
 
Pentax K-x front
Portability
69
Imaging
52
Features
47
Overall
50

Pentax 645Z vs Pentax K-x Key Specs

Pentax 645Z
(Full Review)
  • 51MP - Medium format Sensor
  • 3.2" Tilting Display
  • ISO 100 - 204800
  • No Anti-Alias Filter
  • 1920 x 1080 video
  • Pentax 645AF2 Mount
  • 1550g - 156 x 117 x 123mm
  • Revealed April 2014
  • Succeeded the Pentax 645D
Pentax K-x
(Full Review)
  • 12MP - APS-C Sensor
  • 2.7" Fixed Screen
  • ISO 100 - 6400 (Boost to 12800)
  • Sensor based Image Stabilization
  • 1/6000s Max Shutter
  • 1280 x 720 video
  • Pentax KAF2 Mount
  • 580g - 123 x 92 x 68mm
  • Launched December 2009
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Pentax 645Z vs Pentax K-x Overview

Let's look a bit more in depth at the Pentax 645Z vs Pentax K-x, one being a Pro DSLR and the latter is a Entry-Level DSLR and both are built by Pentax. There is a crucial difference among the image resolutions of the 645Z (51MP) and K-x (12MP) and the 645Z (Medium format) and K-x (APS-C) enjoy different sensor size.

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The 645Z was launched 4 years later than the K-x and that is a fairly serious gap as far as camera tech is concerned. Both the cameras come with different body type with the Pentax 645Z being a Large SLR camera and the Pentax K-x being a Compact SLR camera.

Before diving in to a complete comparison, below is a concise view of how the 645Z grades versus the K-x in relation to portability, imaging, features and an overall grade.

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

 645Z K-x 
LaunchedApril 2014December 2009More recent by 53 months
Screen typeTiltingFixed Tilting screen
Screen dimension3.2"2.7"Bigger screen (+0.5")
Screen resolution1037k230kSharper screen (+807k dot)

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

 K-x 645Z 

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

 645Z K-x 
Manually focus More precise focusing
Selfie screen Neither offers selfie screen
Touch screen Neither offers Touch screen

Pentax 645Z vs Pentax K-x Physical Comparison

If you're looking to lug around your camera, you will have to factor in its weight and volume. The Pentax 645Z offers outer dimensions of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") and a weight of 1550 grams (3.42 lbs) while the Pentax K-x has sizing of 123mm x 92mm x 68mm (4.8" x 3.6" x 2.7") along with a weight of 580 grams (1.28 lbs).

Contrast the Pentax 645Z vs Pentax K-x in the new Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses

Always remember, the weight of an Interchangeable Lens Camera will change dependant on the lens you are utilizing during that time. The following is the front view sizing comparison of the 645Z vs the K-x.

Pentax 645Z vs Pentax K-x size comparison

Taking into account size and weight, the portability rating of the 645Z and K-x is 49 and 69 respectively.

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

Pentax 645Z vs Pentax K-x Sensor Comparison

Oftentimes, it is tough to picture the gap in sensor measurements only by going through technical specs. The photograph below will offer you a far better sense of the sensor sizes in the 645Z and K-x.

As you can tell, both cameras posses different resolutions and different sensor measurements. The 645Z because of its bigger sensor is going to make getting shallow depth of field simpler and the Pentax 645Z will provide greater detail utilizing its extra 39 Megapixels. Higher resolution will allow you to crop photographs somewhat more aggressively. The fresher 645Z should have a benefit in sensor tech.

Pentax 645Z vs Pentax K-x sensor size comparison

Pentax 645Z vs Pentax K-x Screen and ViewFinder

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

Portrait Comparison

Pentax 645Z Portrait photography highlights
Pentax K-x Portrait photography highlights
88
manual focus
MP count excellent (51 megapixels)
big sensor size (Medium format)
includes face detect focus
delivers RAW files
63
manual focus
sensor size is decent (APS-C)
comes with face detect focus
delivers RAW files
low megapixels (12MP)
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Street Comparison

Pentax 645Z as a Street photography camera
Pentax K-x as a Street photography camera
63
has a tilting screen
big sensor size (Medium format)
delivers RAW files
weather proof
very good high ISO (204,800)
no image stabilization
heavier than competition (1,550 grams)
67
built in image stabilization (Sensor based)
sensor size is decent (APS-C)
delivers RAW files
no moving screen
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Sports Comparison

Pentax 645Z Sports photography factors
Pentax K-x Sports photography factors
71
MP count excellent (51MP)
big sensor size (Medium format)
includes tracking focus
weather proof
sensor has phase detect auto focus
continuous shooting slow (3.0 fps)
no image stabilization
low battery life (650 CIPA)
61
great max shutter speed (1/6,000 seconds)
built in image stabilization (Sensor based)
sensor size is decent (APS-C)
great battery life (1,900 per charge)
has phase detect auto focus
slow continuous shooting (5.0 frames per second)
low megapixels (12MP)
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Travel Comparison

Pentax 645Z as a Travel photography camera
Pentax K-x as a Travel photography camera
51
weather proof
MP count excellent (51 megapixels)
low battery life (650 shots)
heavier than competition (1,550 grams)
display isn't selfie friendly
54
great battery life (1,900 CIPA)
has built in flash
missing Time Lapse function
low megapixels (12MP)
does not feature selfie friendly display
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Landscape Comparison

Pentax 645Z Landscape photography highlights
Pentax K-x Landscape photography highlights
78
manual focus
interchangeable lenses (Pentax 645AF2 mount)
screen size is good (3.2")
MP count excellent (51MP)
big sensor size (Medium format)
doesnt have anti aliasing filter
very good high ISO (204,800)
delivers RAW files
weather proof
has double storage slots
no image stabilization
low battery life (650 shots)
61
manual focus
switch lenses (Pentax KAF2 mount)
built in image stabilization (Sensor based)
sensor size is decent (APS-C)
delivers RAW files
great battery life (1,900 per charge)
small screen (2.7 inch)
low megapixels (12 megapixels)
missing Time Lapse function
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Vlogging Comparison

Pentax 645Z as a Vlogging camera
Pentax K-x as a Vlogging camera
27
includes face detect focus
high quality video (1920 x 1080 pixels)
includes mic port
display isn't selfie friendly
no image stabilization
heavier than competition (1,550 grams)
27
built in image stabilization (Sensor based)
comes with face detect focus
does not feature selfie friendly display
video quality not great (1280 x 720 pixels)
missing mic jack
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Pentax 645Z vs Pentax K-x Specifications

Detailed spec comparison table for Pentax 645Z and Pentax K-x
 Pentax 645ZPentax K-x
General Information
Make Pentax Pentax
Model Pentax 645Z Pentax K-x
Class Pro DSLR Entry-Level DSLR
Revealed 2014-04-15 2009-12-23
Body design Large SLR Compact SLR
Sensor Information
Processor PRIME III Prime
Sensor type CMOS 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 51 megapixel 12 megapixel
Anti aliasing filter
Aspect ratio 4:3 3:2
Peak resolution 8256 x 6192 4288 x 2848
Highest native ISO 204800 6400
Highest enhanced ISO - 12800
Min native ISO 100 100
RAW format
Autofocusing
Focus manually
Touch focus
Autofocus continuous
Autofocus single
Tracking autofocus
Selective autofocus
Autofocus center weighted
Multi area autofocus
Autofocus live view
Face detect autofocus
Contract detect autofocus
Phase detect autofocus
Number of focus points 27 11
Lens
Lens mount Pentax 645AF2 Pentax KAF2
Available lenses 6 151
Crop factor 0.8 1.5
Screen
Display type Tilting Fixed Type
Display sizing 3.2 inches 2.7 inches
Display resolution 1,037k dot 230k dot
Selfie friendly
Liveview
Touch friendly
Display technology - TFT LCD monitor
Viewfinder Information
Viewfinder Optical (pentaprism) Optical (pentamirror)
Viewfinder coverage 98 percent 96 percent
Viewfinder magnification 0.85x 0.57x
Features
Minimum shutter speed 30s 30s
Fastest shutter speed 1/4000s 1/6000s
Continuous shutter speed 3.0fps 5.0fps
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation Yes Yes
Set white balance
Image stabilization
Built-in flash
Flash range no built-in flash 16.00 m
Flash options Flash On, Flash On+Red-eye Reduction, Slow-speed Sync, Slow-speed Sync+Red-eye, P-TTL, Trailing Curtain Sync, contrast-control-sync, high-speed sync, wireless sync Auto, On, Off, Red-Eye, Slow Sync, Rear curtain, Wireless
Hot shoe
AEB
White balance bracketing
Fastest flash sync 1/125s 1/180s
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
Video features
Supported video resolutions 1920 x 1080 (60i, 50i, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p,24p) 1280 x 720 (24 fps), 640 x 416 (24 fps)
Highest video resolution 1920x1080 1280x720
Video format MPEG-4, H.264 Motion JPEG
Mic input
Headphone input
Connectivity
Wireless None None
Bluetooth
NFC
HDMI
USB USB 3.0 (5 GBit/sec) USB 2.0 (480 Mbit/sec)
GPS Optional None
Physical
Environment seal
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 1550g (3.42 lbs) 580g (1.28 lbs)
Dimensions 156 x 117 x 123mm (6.1" x 4.6" x 4.8") 123 x 92 x 68mm (4.8" x 3.6" x 2.7")
DXO scores
DXO Overall score 101 72
DXO Color Depth score 26.0 22.8
DXO Dynamic range score 14.7 12.5
DXO Low light score 4505 811
Other
Battery life 650 pictures 1900 pictures
Form of battery Battery Pack Battery Pack
Battery model D-LI90 4 x AA
Self timer Yes (2 or 10 secs) Yes (2 or 12 sec)
Time lapse feature
Storage media Dual SD/SDHC/SDXC slots SD/SDHC card
Storage slots 2 1
Pricing at release $5,024 $600