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Pentax 645D vs Pentax K100D S

Portability
50
Imaging
76
Features
52
Overall
66
Pentax 645D front
 
Pentax K100D Super front
Portability
65
Imaging
45
Features
38
Overall
42

Pentax 645D vs Pentax K100D S 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
  • Revealed March 2010
  • Replacement is Pentax 645Z
Pentax K100D S
(Full Review)
  • 6MP - APS-C Sensor
  • 2.5" Fixed Screen
  • ISO 200 - 3200
  • Sensor based Image Stabilization
  • No Video
  • Pentax KAF2 Mount
  • 646g - 129 x 91 x 71mm
  • Released June 2007
  • Old Model is Pentax K100D
  • New Model is Pentax K200D
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Pentax 645D vs Pentax K100D S Overview

Here, we will be analyzing the Pentax 645D vs Pentax K100D S, former is a Pro DSLR while the latter is a Entry-Level DSLR and both of them are offered by Pentax. There exists a considerable gap among the image resolutions of the 645D (40MP) and K100D S (6MP) and the 645D (Medium format) and K100D S (APS-C) have totally different sensor size.

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The 645D was unveiled 2 years after the K100D S which is a fairly large difference as far as camera technology is concerned. Both the cameras feature different body design with the Pentax 645D being a Large SLR camera and the Pentax K100D S being a Compact SLR camera.

Before diving straight to a in-depth comparison, here is a short summation of how the 645D matches up against the K100D S for portability, imaging, features and an overall score.

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Reasons to pick Pentax 645D over the Pentax K100D S

 645D K100D S 
ReleasedMarch 2010June 2007More modern by 33 months
Screen size3"2.5"Bigger screen (+0.5")
Screen resolution921k210kCrisper screen (+711k dot)

Reasons to pick Pentax K100D S over the Pentax 645D

 K100D S 645D 

Common features in the Pentax 645D and Pentax K100D S

 645D K100D S 
Manually focus Very accurate focus
Screen typeFixed Fixed Fixed screen
Selfie screen Neither has selfie screen
Touch friendly screen Lack of Touch friendly screen

Pentax 645D vs Pentax K100D S Physical Comparison

If you are going to carry around your camera, you will have to factor its weight and dimensions. The Pentax 645D has outside dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") with a weight of 1480 grams (3.26 lbs) while the Pentax K100D S has dimensions of 129mm x 91mm x 71mm (5.1" x 3.6" x 2.8") having a weight of 646 grams (1.42 lbs).

Analyze the Pentax 645D vs Pentax K100D S in our completely new Camera & Lens Size Comparison Tool. Camera Size Comparison with Lenses

Remember that, the weight of an ILC will vary dependant on the lens you have attached at that moment. Here is a front view measurement comparison of the 645D against the K100D S.

Pentax 645D vs Pentax K100D S size comparison

Taking into account dimensions and weight, the portability score of the 645D and K100D S is 50 and 65 respectively.

Pentax 645D vs Pentax K100D S top view buttons comparison

Pentax 645D vs Pentax K100D S Sensor Comparison

Quite often, its difficult to see the gap in sensor sizes only by researching specs. The image here will give you a clearer sense of the sensor dimensions in the 645D and K100D S.

As you can plainly see, both of the cameras feature different megapixels and different sensor sizes. The 645D using its bigger sensor will make achieving shallower DOF less difficult and the Pentax 645D will provide you with more detail having an extra 34MP. Higher resolution can also help you crop pictures way more aggressively. The fresher 645D is going to have an edge with regard to sensor tech.

Pentax 645D vs Pentax K100D S sensor size comparison

Pentax 645D vs Pentax K100D S Screen and ViewFinder

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

Portrait Comparison

Pentax 645D as a Portrait photography camera
Pentax K100D S as a Portrait photography camera
77
focusing manually
megapixel count high (40 megapixels)
sensor size is big (Medium format)
supports RAW formats
doesn't have liveview
51
you can focus manually
sensor size is good (APS-C)
saves RAW formats
does not have liveview
megapixel count low (6 megapixels)
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Street Comparison

Pentax 645D as a Street photography camera
Pentax K100D S as a Street photography camera
58
sensor size is big (Medium format)
supports RAW formats
environment proof
no moving screen
no image stabilization
64
has image stabilization (Sensor based)
sensor size is good (APS-C)
saves RAW formats
fixed screen
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Sports Comparison

Pentax 645D Sports photography features
Pentax K100D S Sports photography features
63
megapixel count high (40 megapixels)
sensor size is big (Medium format)
environment proof
supports phase detect AF
doesn't have liveview
max frames per second low (1.0 frames per second)
no image stabilization
terrible battery pack (800 shots)
47
has image stabilization (Sensor based)
sensor size is good (APS-C)
has phase detect auto focus
does not have liveview
painfully slow continuous shooting (3.0 fps)
megapixel count low (6MP)
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Travel Comparison

Pentax 645D Travel photography highlights
Pentax K100D S Travel photography highlights
55
environment proof
megapixel count high (40MP)
terrible battery pack (800 per charge)
display is not selfie friendly
45
has built in flash
lack of Time Lapse recording
megapixel count low (6MP)
doesn't have a selfie friendly display
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Landscape Comparison

Pentax 645D Landscape photography features
Pentax K100D S Landscape photography features
72
focusing manually
switch lenses (Pentax 645AF2 mount)
screen size is good (3 inches)
megapixel count high (40 megapixels)
sensor size is big (Medium format)
no anti aliasing filter
supports RAW formats
environment proof
two card slots
doesn't have liveview
no image stabilization
terrible battery pack (800 shots)
52
you can focus manually
interchangeable lenses (Pentax KAF2 mount)
has image stabilization (Sensor based)
sensor size is good (APS-C)
saves RAW formats
screen is somewhat small (2.5 inch)
does not have liveview
megapixel count low (6MP)
lack of Time Lapse recording
Photography Glossary

Vlogging Comparison

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

Detailed spec comparison table for Pentax 645D and Pentax K100D S
 Pentax 645DPentax K100D Super
General Information
Make Pentax Pentax
Model type Pentax 645D Pentax K100D Super
Category Pro DSLR Entry-Level DSLR
Revealed 2010-03-10 2007-06-28
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 area 1,452.0mm² 369.0mm²
Sensor resolution 40 megapixels 6 megapixels
Anti alias filter
Aspect ratio 4:3 3:2
Highest resolution 7264 x 5440 3008 x 2008
Highest native ISO 1600 3200
Minimum native ISO 200 200
RAW files
Minimum boosted ISO 100 -
Autofocusing
Manual focusing
Touch focus
Continuous autofocus
Single autofocus
Autofocus tracking
Autofocus selectice
Center weighted autofocus
Autofocus multi area
Live view autofocus
Face detect autofocus
Contract detect autofocus
Phase detect autofocus
Total focus points 11 11
Lens
Lens mount type Pentax 645AF2 Pentax KAF2
Amount of lenses 6 151
Crop factor 0.8 1.5
Screen
Type of display Fixed Type Fixed Type
Display sizing 3" 2.5"
Resolution of display 921k dots 210k dots
Selfie friendly
Liveview
Touch display
Display 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
Slowest shutter speed 30 seconds 30 seconds
Maximum shutter speed 1/4000 seconds 1/4000 seconds
Continuous shooting rate 1.0fps 3.0fps
Shutter priority
Aperture priority
Manual mode
Exposure compensation Yes Yes
Set white balance
Image stabilization
Integrated flash
Flash distance no built-in flash -
Flash settings Auto, On, Off, Red-eye, Slow Sync, Rear Curtain Auto, On, Off, Red-eye reduction
Hot shoe
Auto exposure bracketing
WB bracketing
Maximum flash synchronize 1/125 seconds 1/180 seconds
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
Environment sealing
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 1480 gr (3.26 lbs) 646 gr (1.42 lbs)
Physical dimensions 156 x 117 x 119mm (6.1" x 4.6" x 4.7") 129 x 91 x 71mm (5.1" x 3.6" x 2.8")
DXO scores
DXO All around rating 82 not tested
DXO Color Depth rating 24.6 not tested
DXO Dynamic range rating 12.6 not tested
DXO Low light rating 1262 not tested
Other
Battery life 800 photographs -
Battery type Battery Pack -
Battery ID D-LI90 4 x AA
Self timer Yes (2 or 10 sec) Yes (2 or 12 sec)
Time lapse feature
Storage type SD/SDHC SD/SDHC card
Card slots Two 1
Retail price $4,000 $520