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Pentax 645D vs Pentax K-S1

Portability
50
Imaging
76
Features
52
Overall
66
Pentax 645D front
 
Pentax K-S1 front
Portability
69
Imaging
63
Features
70
Overall
65

Pentax 645D vs Pentax K-S1 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
  • Newer Model is Pentax 645Z
Pentax K-S1
(Full Review)
  • 20MP - APS-C Sensor
  • 3" Fixed Screen
  • ISO 100 - 51200
  • Sensor based Image Stabilization
  • No Anti-Alias Filter
  • 1/6000s Max Shutter
  • 1920 x 1080 video
  • Pentax KAF2 Mount
  • 558g - 121 x 93 x 70mm
  • Released August 2014
  • Successor is Pentax K-S2
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Pentax 645D vs Pentax K-S1 Overview

Lets look more closely at the Pentax 645D vs Pentax K-S1, one is a Pro DSLR and the latter is a Advanced DSLR and both are manufactured by Pentax. There is a big difference between the sensor resolutions of the 645D (40MP) and K-S1 (20MP) and the 645D (Medium format) and K-S1 (APS-C) offer different sensor sizing.

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The 645D was released 5 years before the K-S1 which is quite a big gap as far as tech is concerned. Each of these cameras have different body design with the Pentax 645D being a Large SLR camera and the Pentax K-S1 being a Mid-size SLR camera.

Before we go straight to a more detailed comparison, here is a simple synopsis of how the 645D grades against the K-S1 for portability, imaging, features and an overall mark.

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Reasons to pick Pentax 645D over the Pentax K-S1

 645D K-S1 

Reasons to pick Pentax K-S1 over the Pentax 645D

 K-S1 645D 
ReleasedAugust 2014March 2010Newer by 54 months

Common features in the Pentax 645D and Pentax K-S1

 645D K-S1 
Manually focus Very accurate focusing
Screen typeFixed Fixed Fixed screen
Screen dimensions3"3"Equal screen measurement
Screen resolution921k921kIdentical screen resolution
Selfie screen Neither provides selfie screen
Touch screen Absent Touch screen

Pentax 645D vs Pentax K-S1 Physical Comparison

For anybody who is planning to travel with your camera, you need to think about its weight and proportions. The Pentax 645D provides exterior dimensions of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") having a weight of 1480 grams (3.26 lbs) while the Pentax K-S1 has measurements of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") having a weight of 558 grams (1.23 lbs).

Check out the Pentax 645D vs Pentax K-S1 in the new Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses

Remember that, the weight of an Interchangeable Lens Camera will vary based on the lens you use at that moment. Following is a front view measurements comparison of the 645D and the K-S1.

Pentax 645D vs Pentax K-S1 size comparison

Looking at size and weight, the portability score of the 645D and K-S1 is 50 and 69 respectively.

Pentax 645D vs Pentax K-S1 top view buttons comparison

Pentax 645D vs Pentax K-S1 Sensor Comparison

Generally, it's hard to imagine the gap between sensor dimensions just by going over technical specs. The image underneath will help offer you a better sense of the sensor sizes in the 645D and K-S1.

As you have seen, both of the cameras provide different megapixels and different sensor dimensions. The 645D featuring a bigger sensor is going to make getting bokeh simpler and the Pentax 645D will deliver extra detail as a result of its extra 20MP. Higher resolution will enable you to crop photographs more aggressively. The more aged 645D is going to be disadvantaged with regard to sensor tech.

Pentax 645D vs Pentax K-S1 sensor size comparison

Pentax 645D vs Pentax K-S1 Screen and ViewFinder

Pentax 645D vs Pentax K-S1 Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Pentax 645D Portrait photography features
Pentax K-S1 Portrait photography features
77
focusing manually
MP count fantastic (40MP)
great sensor size (Medium format)
delivers RAW files
doesn't have liveview
77
focusing manually
MP count good (20 megapixels)
decent sensor size (APS-C)
provides face detection focus
delivers RAW files
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Street Comparison

Pentax 645D as a Street photography camera
Pentax K-S1 as a Street photography camera
58
great sensor size (Medium format)
delivers RAW files
environment proof
screen is fixed
lack of image stabilization
73
has image stabilization (Sensor based)
decent sensor size (APS-C)
delivers RAW files
lighter than others (558 grams)
above average ISO range (51,200)
screen is fixed
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Sports Comparison

Pentax 645D Sports photography information
Pentax K-S1 Sports photography information
63
MP count fantastic (40 megapixels)
great sensor size (Medium format)
environment proof
supports phase detect AF
doesn't have liveview
continuous shooting slow (1.0 frames/s)
lack of image stabilization
bad battery life (800 CIPA)
69
great max shutter speed (1/6,000s)
has image stabilization (Sensor based)
MP count good (20 megapixels)
decent sensor size (APS-C)
provides tracking autofocus
sensor has phase detect auto focus
low frames per second (5.4 frames/s)
not so great battery life (410 per charge)
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Travel Comparison

Pentax 645D as a Travel photography camera
Pentax K-S1 as a Travel photography camera
55
environment proof
MP count fantastic (40MP)
bad battery life (800 CIPA)
does not offer selfie friendly display
60
lighter than others (558g)
MP count good (20MP)
has built in flash
does not have Timelapse mode
not so great battery life (410 shots)
does not have a selfie friendly display
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Landscape Comparison

Pentax 645D Landscape photography advice
Pentax K-S1 Landscape photography advice
72
focusing manually
interchangeable lenses (Pentax 645AF2 mount)
screen size is good (3 inch)
MP count fantastic (40 megapixels)
great sensor size (Medium format)
doesnt have anti-alias filter
delivers RAW files
environment proof
2 card slots
doesn't have liveview
lack of image stabilization
bad battery life (800 shots)
73
focusing manually
switch lenses (Pentax KAF2 mount)
screen size is good (3")
has image stabilization (Sensor based)
MP count good (20 megapixels)
decent sensor size (APS-C)
does not have anti aliasing filter
above average ISO range (51,200)
delivers RAW files
not so great battery life (410 per charge)
does not have Timelapse mode
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Vlogging Comparison

Pentax 645D Vlogging details
Pentax K-S1 Vlogging details
9
no video
33
has image stabilization (Sensor based)
provides face detection focus
video resolution high (1920 x 1080 resolution)
lighter than others (558g)
does not have a selfie friendly display
does not have external microphone socket
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Pentax 645D vs Pentax K-S1 Specifications

Detailed spec comparison table for Pentax 645D and Pentax K-S1
 Pentax 645DPentax K-S1
General Information
Manufacturer Pentax Pentax
Model Pentax 645D Pentax K-S1
Category Pro DSLR Advanced DSLR
Revealed 2010-03-10 2014-08-27
Physical type Large SLR Mid-size SLR
Sensor Information
Chip Prime II Prime MII
Sensor type CCD CMOS
Sensor size Medium format APS-C
Sensor measurements 44 x 33mm 23.5 x 15.6mm
Sensor surface area 1,452.0mm² 366.6mm²
Sensor resolution 40MP 20MP
Anti aliasing filter
Aspect ratio 4:3 3:2
Peak resolution 7264 x 5440 5472 x 3648
Highest native ISO 1600 51200
Minimum native ISO 200 100
RAW data
Minimum enhanced ISO 100 -
Autofocusing
Focus manually
Autofocus touch
Continuous autofocus
Single autofocus
Tracking autofocus
Autofocus selectice
Autofocus center weighted
Autofocus multi area
Live view autofocus
Face detect focus
Contract detect focus
Phase detect focus
Number of focus points 11 11
Lens
Lens mounting type Pentax 645AF2 Pentax KAF2
Amount of lenses 6 151
Focal length multiplier 0.8 1.5
Screen
Type of display Fixed Type Fixed Type
Display size 3" 3"
Display resolution 921k dots 921k dots
Selfie friendly
Liveview
Touch capability
Display tech TFT Color LCD with wide-viewing angle and with AR coating -
Viewfinder Information
Viewfinder Optical (pentaprism) Optical (pentaprism)
Viewfinder coverage 98 percent 100 percent
Viewfinder magnification 0.85x 0.64x
Features
Minimum shutter speed 30s 30s
Fastest shutter speed 1/4000s 1/6000s
Continuous shutter rate 1.0 frames per sec 5.4 frames per sec
Shutter priority
Aperture priority
Expose Manually
Exposure compensation Yes Yes
Change white balance
Image stabilization
Integrated flash
Flash range no built-in flash 10.00 m (at ISO 100)
Flash settings Auto, On, Off, Red-eye, Slow Sync, Rear Curtain Auto, auto + redeye, on, on + redeye reduction, slow sync, trailing curtain sync, manual
External flash
Auto exposure bracketing
White balance bracketing
Fastest flash synchronize 1/125s -
Exposure
Multisegment metering
Average metering
Spot metering
Partial metering
AF area metering
Center weighted metering
Video features
Supported video resolutions - 1920 x 1080 (30,25,24 fps), 1280 x 720 (60,50 fps)
Highest video resolution None 1920x1080
Video file format - H.264
Microphone port
Headphone port
Connectivity
Wireless None Eye-Fi Connected
Bluetooth
NFC
HDMI
USB USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec)
GPS None Optional
Physical
Environmental sealing
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 1480 gr (3.26 lbs) 558 gr (1.23 lbs)
Physical dimensions 156 x 117 x 119mm (6.1" x 4.6" x 4.7") 121 x 93 x 70mm (4.8" x 3.7" x 2.8")
DXO scores
DXO Overall score 82 78
DXO Color Depth score 24.6 23.5
DXO Dynamic range score 12.6 13.0
DXO Low light score 1262 1061
Other
Battery life 800 photographs 410 photographs
Battery type Battery Pack Battery Pack
Battery model D-LI90 D-LI109
Self timer Yes (2 or 10 sec) Yes ( 2 or 12 seconds)
Time lapse recording
Storage type SD/SDHC SD/SDHC/SDXC
Card slots Two Single
Retail pricing $4,000 $339