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Pentax 645Z vs Pentax K100D

Portability
49
Imaging
80
Features
74
Overall
77
Pentax 645Z front
 
Pentax K100D front
Portability
64
Imaging
45
Features
36
Overall
41

Pentax 645Z vs Pentax K100D 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
  • Old Model is Pentax 645D
Pentax K100D
(Full Review)
  • 6MP - APS-C Sensor
  • 2.5" Fixed Screen
  • ISO 200 - 3200
  • Sensor based Image Stabilization
  • No Video
  • Pentax KAF Mount
  • 660g - 129 x 93 x 70mm
  • Launched December 2006
  • Refreshed by Pentax K100D S
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Pentax 645Z vs Pentax K100D Overview

Here is a complete assessment of the Pentax 645Z vs Pentax K100D, former being a Pro DSLR while the latter is a Entry-Level DSLR and both are manufactured by Pentax. There exists a sizable gap between the sensor resolutions of the 645Z (51MP) and K100D (6MP) and the 645Z (Medium format) and K100D (APS-C) enjoy different sensor measurements.

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The 645Z was launched 7 years later than the K100D and that is quite a significant difference as far as technology is concerned. The two cameras offer different body type with the Pentax 645Z being a Large SLR camera and the Pentax K100D being a Compact SLR camera.

Before getting straight into a complete comparison, below is a short summary of how the 645Z matches up against the K100D with regard to portability, imaging, features and an overall rating.

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Reasons to pick Pentax 645Z over the Pentax K100D

 645Z K100D 
LaunchedApril 2014December 2006Fresher by 90 months
Screen typeTiltingFixed Tilting screen
Screen sizing3.2"2.5"Bigger screen (+0.7")
Screen resolution1037k210kClearer screen (+827k dot)

Reasons to pick Pentax K100D over the Pentax 645Z

 K100D 645Z 

Common features in the Pentax 645Z and Pentax K100D

 645Z K100D 
Focus manually Very accurate focusing
Selfie screen Neither contains selfie screen
Touch screen Neither contains Touch screen

Pentax 645Z vs Pentax K100D Physical Comparison

For those who are planning to carry your camera often, you are going to need to consider its weight and size. The Pentax 645Z has got physical measurements of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") along with a weight of 1550 grams (3.42 lbs) while the Pentax K100D has specifications of 129mm x 93mm x 70mm (5.1" x 3.7" x 2.8") and a weight of 660 grams (1.46 lbs).

Check the Pentax 645Z vs Pentax K100D in our newest Camera & Lens Size Comparison Tool. Camera Size Comparison with Lenses

Do not forget, the weight of an ILC will differ depending on the lens you are working with at that moment. Underneath is the front view proportions comparison of the 645Z vs the K100D.

Pentax 645Z vs Pentax K100D size comparison

Using dimensions and weight, the portability rating of the 645Z and K100D is 49 and 64 respectively.

Pentax 645Z vs Pentax K100D top view buttons comparison

Pentax 645Z vs Pentax K100D Sensor Comparison

More often than not, it's tough to visualize the contrast between sensor sizing only by reading specifications. The graphic below should provide you a stronger sense of the sensor sizing in the 645Z and K100D.

To sum up, the 2 cameras offer different megapixels and different sensor sizing. The 645Z because of its bigger sensor is going to make shooting shallow depth of field simpler and the Pentax 645Z will offer more detail utilizing its extra 45MP. Higher resolution will also let you crop photographs a little more aggressively. The fresher 645Z should have an edge when it comes to sensor technology.

Pentax 645Z vs Pentax K100D sensor size comparison

Pentax 645Z vs Pentax K100D Screen and ViewFinder

Pentax 645Z vs Pentax K100D Screen and Viewfinder comparison
Photography Glossary

Photography Type Scores

Portrait Comparison

Pentax 645Z Portrait photography highlights
Pentax K100D Portrait photography highlights
88
manual focus
megapixel count fantastic (51MP)
sensor size is great (Medium format)
includes face detection autofocus
exports RAW files
51
you can focus manually
nice sensor size (APS-C)
delivers RAW files
does not have liveview
low resolution (6 megapixels)
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Street Comparison

Pentax 645Z Street photography highlights
Pentax K100D Street photography highlights
63
has a tilting screen
sensor size is great (Medium format)
exports RAW files
environment proof
good ISO range (204,800)
lack of image stabilization
heavier than competition in class (1,550 grams)
58
built in image stabilization (Sensor based)
nice sensor size (APS-C)
delivers RAW files
no articulating screen
heavier than competition in class (660g)
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Sports Comparison

Sports photography with Pentax 645Z
Sports photography with Pentax K100D
71
megapixel count fantastic (51MP)
sensor size is great (Medium format)
includes tracking autofocus
environment proof
supports phase detect autofocus
slow frames per second (3.0 fps)
lack of image stabilization
bad battery power (650 shots)
47
built in image stabilization (Sensor based)
nice sensor size (APS-C)
has phase detect autofocus
does not have liveview
painfully slow continuous shooting (3.0 frames per second)
low resolution (6 megapixels)
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Travel Comparison

Pentax 645Z as a Travel photography camera
Pentax K100D as a Travel photography camera
51
environment proof
megapixel count fantastic (51MP)
bad battery power (650 per charge)
heavier than competition in class (1,550 grams)
doesn't contain selfie friendly display
42
flash built-in
lack of Time Lapse recording
heavier than competition in class (660g)
low resolution (6MP)
does not offer selfie friendly display
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Landscape Comparison

Pentax 645Z Landscape photography factors
Pentax K100D Landscape photography factors
78
manual focus
interchangeable lenses (Pentax 645AF2 mount)
nice screen size (3.2")
megapixel count fantastic (51 megapixels)
sensor size is great (Medium format)
does not have low pass filter
good ISO range (204,800)
exports RAW files
environment proof
has dual storage slots
lack of image stabilization
bad battery power (650 shots)
52
you can focus manually
switch lenses (Pentax KAF mount)
built in image stabilization (Sensor based)
nice sensor size (APS-C)
delivers RAW files
small screen (2.5 inch)
does not have liveview
low resolution (6MP)
lack of Time Lapse recording
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Vlogging Comparison

Vlogging with Pentax 645Z
Vlogging with Pentax K100D
27
includes face detection autofocus
video res high (1920 x 1080 resolution)
comes with external mic jack
doesn't contain selfie friendly display
lack of image stabilization
heavier than competition in class (1,550 grams)
9
no video
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Pentax 645Z vs Pentax K100D Specifications

Detailed spec comparison table for Pentax 645Z and Pentax K100D
 Pentax 645ZPentax K100D
General Information
Manufacturer Pentax Pentax
Model Pentax 645Z Pentax K100D
Class Pro DSLR Entry-Level DSLR
Revealed 2014-04-15 2006-12-03
Physical type Large SLR Compact SLR
Sensor Information
Processor PRIME III -
Sensor type CMOS CCD
Sensor size Medium format APS-C
Sensor dimensions 44 x 33mm 23.5 x 15.7mm
Sensor surface area 1,452.0mm² 369.0mm²
Sensor resolution 51 megapixel 6 megapixel
Anti aliasing filter
Aspect ratio 4:3 3:2
Highest Possible resolution 8256 x 6192 3008 x 2008
Maximum native ISO 204800 3200
Minimum native ISO 100 200
RAW format
Autofocusing
Focus manually
AF touch
Continuous AF
Single AF
Tracking AF
AF selectice
AF center weighted
AF multi area
Live view AF
Face detect AF
Contract detect AF
Phase detect AF
Number of focus points 27 11
Lens
Lens mounting type Pentax 645AF2 Pentax KAF
Available lenses 6 151
Crop factor 0.8 1.5
Screen
Type of display Tilting Fixed Type
Display sizing 3.2 inch 2.5 inch
Resolution of display 1,037 thousand dots 210 thousand dots
Selfie friendly
Liveview
Touch friendly
Viewfinder Information
Viewfinder type Optical (pentaprism) Optical (pentamirror)
Viewfinder coverage 98% 96%
Viewfinder magnification 0.85x 0.57x
Features
Minimum shutter speed 30s 30s
Fastest shutter speed 1/4000s 1/4000s
Continuous shutter rate 3.0 frames/s 3.0 frames/s
Shutter priority
Aperture priority
Manual mode
Exposure compensation Yes Yes
Change WB
Image stabilization
Built-in flash
Flash range no built-in flash -
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 reduction
Hot shoe
Auto exposure bracketing
White balance bracketing
Fastest flash synchronize 1/125s 1/180s
Exposure
Multisegment metering
Average metering
Spot metering
Partial metering
AF area metering
Center weighted metering
Video features
Supported video resolutions 1920 x 1080 (60i, 50i, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p,24p) -
Maximum video resolution 1920x1080 None
Video data format MPEG-4, H.264 -
Mic support
Headphone support
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 sealing
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 1550 grams (3.42 lbs) 660 grams (1.46 lbs)
Dimensions 156 x 117 x 123mm (6.1" x 4.6" x 4.8") 129 x 93 x 70mm (5.1" x 3.7" x 2.8")
DXO scores
DXO Overall score 101 not tested
DXO Color Depth score 26.0 not tested
DXO Dynamic range score 14.7 not tested
DXO Low light score 4505 not tested
Other
Battery life 650 pictures -
Battery style 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 type Dual SD/SDHC/SDXC slots SD/MMC card
Card slots Two 1
Cost at release $5,024 $0