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Pentax 645D vs Pentax K100D

Portability
50
Imaging
76
Features
52
Overall
66
Pentax 645D front
 
Pentax K100D front
Portability
64
Imaging
45
Features
36
Overall
41

Pentax 645D vs Pentax K100D Key Specs

Pentax 645D
(Full Review)
  • 40MP - Medium format Sensor
  • 3" Fixed Screen
  • ISO 200 - 1600
  • No Anti-Alias Filter
  • No Video
  • Pentax 645AF2 Mount
  • 1480g - 156 x 117 x 119mm
  • Released March 2010
  • Replacement is Pentax 645Z
Pentax K100D
(Full Review)
  • 6MP - APS-C Sensor
  • 2.5" Fixed Display
  • ISO 200 - 3200
  • Sensor based Image Stabilization
  • No Video
  • Pentax KAF Mount
  • 660g - 129 x 93 x 70mm
  • Revealed December 2006
  • Newer Model is Pentax K100D S
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Pentax 645D vs Pentax K100D Overview

Lets look a little more in depth at the Pentax 645D and Pentax K100D, one being a Pro DSLR and the other is a Entry-Level DSLR and they are both designed by Pentax. There is a crucial difference among the resolutions of the 645D (40MP) and K100D (6MP) and the 645D (Medium format) and K100D (APS-C) enjoy totally different sensor size.

Photography Glossary

The 645D was launched 3 years later than the K100D and that is a fairly serious gap as far as camera tech is concerned. Each of the cameras come with different body type with the Pentax 645D being a Large SLR camera and the Pentax K100D being a Compact SLR camera.

Before getting in to a step-by-step comparison, below is a concise summary of how the 645D scores against the K100D in terms of portability, imaging, features and an overall grade.

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Reasons to pick Pentax 645D over the Pentax K100D

 645D K100D 
RevealedMarch 2010December 2006More recent by 40 months
Display dimension3"2.5"Larger display (+0.5")
Display resolution921k210kSharper display (+711k dot)

Reasons to pick Pentax K100D over the Pentax 645D

 K100D 645D 

Common features in the Pentax 645D and Pentax K100D

 645D K100D 
Focus manually Dial exact focusing
Display typeFixed Fixed Fixed display
Selfie screen Neither offers selfie screen
Touch friendly display Absent Touch friendly display

Pentax 645D vs Pentax K100D Physical Comparison

For anyone who is going to lug around your camera, you are going to need to think about its weight and measurements. The Pentax 645D offers outer dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") and a weight of 1480 grams (3.26 lbs) whilst the Pentax K100D has proportions of 129mm x 93mm x 70mm (5.1" x 3.7" x 2.8") accompanied by a weight of 660 grams (1.46 lbs).

Check the Pentax 645D and Pentax K100D in the latest Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses

Always remember, the weight of an Interchangeable Lens Camera will vary depending on the lens you are employing at that time. Here is the front view overall size comparison of the 645D versus the K100D.

Pentax 645D vs Pentax K100D size comparison

Using size and weight, the portability grade of the 645D and K100D is 50 and 64 respectively.

Pentax 645D vs Pentax K100D top view buttons comparison

Pentax 645D vs Pentax K100D Sensor Comparison

Often, it is very tough to see the gap in sensor measurements merely by checking out specs. The photograph here will provide you a far better sense of the sensor sizes in the 645D and K100D.

As you can plainly see, each of these cameras posses different megapixel count and different sensor measurements. The 645D featuring a larger sensor will make achieving shallow depth of field simpler and the Pentax 645D will produce greater detail utilizing its extra 34 Megapixels. Greater resolution will make it easier to crop images somewhat more aggressively. The younger 645D is going to have an advantage in sensor technology.

Pentax 645D vs Pentax K100D sensor size comparison

Pentax 645D vs Pentax K100D Screen and ViewFinder

Pentax 645D vs Pentax K100D Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Pentax 645D as a Portrait photography camera
Pentax K100D as a Portrait photography camera
77
focusing manually
resolution is excellent (40 megapixels)
sensor size is large (Medium format)
supports RAW formats
doesn't have liveview
51
has manual focus
sensor size is decent (APS-C)
supports RAW files
no liveview feature
low resolution sensor (6MP)
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Street Comparison

Pentax 645D Street photography information
Pentax K100D Street photography information
58
sensor size is large (Medium format)
supports RAW formats
environment sealing
screen is fixed
lack of image stabilization
58
image stabilization (Sensor based)
sensor size is decent (APS-C)
supports RAW files
no moving screen
heavier than others (660g)
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Sports Comparison

Pentax 645D Sports photography information
Pentax K100D Sports photography information
63
resolution is excellent (40MP)
sensor size is large (Medium format)
environment sealing
sensor has phase detect auto focus
doesn't have liveview
continuous shooting slow (1.0 fps)
lack of image stabilization
low battery pack (800 per charge)
47
image stabilization (Sensor based)
sensor size is decent (APS-C)
has phase detect autofocus
no liveview feature
max fps low (3.0 frames/s)
low resolution sensor (6MP)
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Travel Comparison

Pentax 645D Travel photography factors
Pentax K100D Travel photography factors
55
environment sealing
resolution is excellent (40MP)
low battery pack (800 per charge)
does not have selfie friendly display
42
built-in flash
lack of Time Lapse recording
heavier than others (660g)
low resolution sensor (6 megapixels)
screen isn't selfie friendly
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Landscape Comparison

Pentax 645D Landscape photography info
Pentax K100D Landscape photography info
72
focusing manually
interchangeable lenses (Pentax 645AF2 mount)
screen size is good (3 inch)
resolution is excellent (40 megapixels)
sensor size is large (Medium format)
no low pass filter
supports RAW formats
environment sealing
has dual storage slots
doesn't have liveview
lack of image stabilization
low battery pack (800 shots)
52
has manual focus
swap lenses (Pentax KAF mount)
image stabilization (Sensor based)
sensor size is decent (APS-C)
supports RAW files
tiny screen (2.5")
no liveview feature
low resolution sensor (6MP)
lack of Time Lapse recording
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Vlogging Comparison

Pentax 645D as a Vlogging camera
Pentax K100D as a Vlogging camera
9
no video
9
can't shoot video
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Pentax 645D vs Pentax K100D Specifications

Detailed spec comparison table for Pentax 645D and Pentax K100D
 Pentax 645DPentax K100D
General Information
Brand Pentax Pentax
Model Pentax 645D Pentax K100D
Type Pro DSLR Entry-Level DSLR
Released 2010-03-10 2006-12-03
Physical type Large SLR Compact SLR
Sensor Information
Chip Prime II -
Sensor type CCD 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 40MP 6MP
Anti aliasing filter
Aspect ratio 4:3 3:2
Peak resolution 7264 x 5440 3008 x 2008
Highest native ISO 1600 3200
Minimum native ISO 200 200
RAW files
Minimum enhanced ISO 100 -
Autofocusing
Focus manually
Autofocus touch
Autofocus continuous
Autofocus single
Tracking autofocus
Selective autofocus
Autofocus center weighted
Multi area autofocus
Autofocus live view
Face detection autofocus
Contract detection autofocus
Phase detection autofocus
Number of focus points 11 11
Lens
Lens mount Pentax 645AF2 Pentax KAF
Amount of lenses 6 151
Focal length multiplier 0.8 1.5
Screen
Screen type Fixed Type Fixed Type
Screen sizing 3" 2.5"
Resolution of screen 921k dots 210k dots
Selfie friendly
Liveview
Touch function
Screen technology TFT Color LCD with wide-viewing angle and with AR coating -
Viewfinder Information
Viewfinder Optical (pentaprism) Optical (pentamirror)
Viewfinder coverage 98 percent 96 percent
Viewfinder magnification 0.85x 0.57x
Features
Min shutter speed 30s 30s
Max shutter speed 1/4000s 1/4000s
Continuous shutter rate 1.0 frames/s 3.0 frames/s
Shutter priority
Aperture priority
Manual mode
Exposure compensation Yes Yes
Set white balance
Image stabilization
Built-in flash
Flash range no built-in flash -
Flash options Auto, On, Off, Red-eye, Slow Sync, Rear Curtain Auto, On, Off, Red-eye reduction
External flash
AE bracketing
WB bracketing
Max flash synchronize 1/125s 1/180s
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
Video features
Highest video resolution None None
Mic port
Headphone port
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 1480g (3.26 pounds) 660g (1.46 pounds)
Dimensions 156 x 117 x 119mm (6.1" x 4.6" x 4.7") 129 x 93 x 70mm (5.1" x 3.7" x 2.8")
DXO scores
DXO Overall score 82 not tested
DXO Color Depth score 24.6 not tested
DXO Dynamic range score 12.6 not tested
DXO Low light score 1262 not tested
Other
Battery life 800 images -
Form of battery Battery Pack -
Battery model D-LI90 4 x AA
Self timer Yes (2 or 10 sec) Yes (2 or 12 sec)
Time lapse recording
Storage type SD/SDHC SD/MMC card
Card slots Two Single
Launch cost $4,000 $0