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Olympus E-P1 vs Pentax K-S1

Portability
86
Imaging
47
Features
42
Overall
45
Olympus PEN E-P1 front
 
Pentax K-S1 front
Portability
69
Imaging
63
Features
70
Overall
65

Olympus E-P1 vs Pentax K-S1 Key Specs

Olympus E-P1
(Full Review)
  • 12MP - Four Thirds Sensor
  • 3" Fixed Display
  • ISO 100 - 6400
  • Sensor based Image Stabilization
  • 1280 x 720 video
  • Micro Four Thirds Mount
  • 355g - 121 x 70 x 36mm
  • Launched July 2009
  • New Model is Olympus E-P2
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
  • Announced August 2014
  • Updated by Pentax K-S2
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Olympus E-P1 vs Pentax K-S1 Overview

Lets look a bit more closely at the Olympus E-P1 versus Pentax K-S1, one is a Entry-Level Mirrorless and the latter is a Advanced DSLR by brands Olympus and Pentax. There is a significant difference between the resolutions of the E-P1 (12MP) and K-S1 (20MP) and the E-P1 (Four Thirds) and K-S1 (APS-C) provide totally different sensor size.

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The E-P1 was brought out 6 years prior to the K-S1 which is quite a sizable gap as far as tech is concerned. Both cameras have different body design with the Olympus E-P1 being a Rangefinder-style mirrorless camera and the Pentax K-S1 being a Mid-size SLR camera.

Before getting into a step-by-step comparison, here is a quick highlight of how the E-P1 grades versus the K-S1 in relation to portability, imaging, features and an overall score.

Photography Glossary
	
	

Reasons to pick Olympus E-P1 over the Pentax K-S1

 E-P1 K-S1 

Reasons to pick Pentax K-S1 over the Olympus E-P1

 K-S1 E-P1 
AnnouncedAugust 2014July 2009More modern by 61 months
Screen resolution921k230kClearer screen (+691k dot)

Common features in the Olympus E-P1 and Pentax K-S1

 E-P1 K-S1 
Manually focus More precise focusing
Screen typeFixed Fixed Fixed screen
Screen dimensions3"3"Equal screen size
Selfie screen Neither provides selfie screen
Touch friendly screen No Touch friendly screen

Olympus E-P1 vs Pentax K-S1 Physical Comparison

For anyone who is going to carry around your camera, you have to factor in its weight and measurements. The Olympus E-P1 provides exterior dimensions of 121mm x 70mm x 36mm (4.8" x 2.8" x 1.4") with a weight of 355 grams (0.78 lbs) whilst the Pentax K-S1 has proportions of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") having a weight of 558 grams (1.23 lbs).

Look at the Olympus E-P1 versus Pentax K-S1 in the all new Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses

Don't forget, the weight of an Interchangeable Lens Camera will vary dependant on the lens you have chosen at that time. Following is a front view physical size comparison of the E-P1 against the K-S1.

Olympus E-P1 vs Pentax K-S1 size comparison

Considering size and weight, the portability grade of the E-P1 and K-S1 is 86 and 69 respectively.

Olympus E-P1 vs Pentax K-S1 top view buttons comparison

Olympus E-P1 vs Pentax K-S1 Sensor Comparison

Usually, its difficult to envision the gap between sensor sizes only by checking specs. The picture here will offer you a better sense of the sensor sizes in the E-P1 and K-S1.

All in all, both of the cameras provide different resolutions and different sensor sizes. The E-P1 featuring a tinier sensor will make achieving bokeh trickier and the Pentax K-S1 will give greater detail having its extra 8 Megapixels. Higher resolution will also help you crop shots more aggressively. The more aged E-P1 is going to be behind when it comes to sensor innovation.

Olympus E-P1 vs Pentax K-S1 sensor size comparison

Olympus E-P1 vs Pentax K-S1 Screen and ViewFinder

Olympus E-P1 vs Pentax K-S1 Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Olympus E-P1 Portrait photography details
Pentax K-S1 Portrait photography details
60
you can focus manually
sensor size is decent (Four Thirds)
offers face detect focusing
delivers RAW files
megapixel count low (12MP)
77
you can focus manually
MP count good (20MP)
nice sensor size (APS-C)
features face detection focusing
delivers RAW formats
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Street Comparison

Olympus E-P1 Street photography information
Pentax K-S1 Street photography information
74
has image stabilization (Sensor based)
sensor size is decent (Four Thirds)
delivers RAW files
no moving screen
73
has image stabilization (Sensor based)
nice sensor size (APS-C)
delivers RAW formats
lighter than average (558 grams)
great ISO range (51,200)
fixed screen
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Sports Comparison

Olympus E-P1 Sports photography advice
Pentax K-S1 Sports photography advice
40
has image stabilization (Sensor based)
sensor size is decent (Four Thirds)
very slow continuous shooting (3.0 frames/s)
megapixel count low (12 megapixels)
terrible battery life (300 shots)
doesn't have phase detect AF
69
great max shutter speed (1/6,000s)
has image stabilization (Sensor based)
MP count good (20 megapixels)
nice sensor size (APS-C)
features tracking autofocus
has phase detect AF
very slow continuous shooting (5.4 frames per second)
bad battery life (410 CIPA)
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Travel Comparison

Olympus E-P1 Travel photography highlights
Pentax K-S1 Travel photography highlights
43
lack of Time Lapse mode
terrible battery life (300 shots)
megapixel count low (12MP)
screen isn't selfie friendly
60
lighter than average (558 grams)
MP count good (20MP)
built-in flash
doesn't have Timelapse mode
bad battery life (410 per charge)
display is not selfie friendly
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Landscape Comparison

Olympus E-P1 Landscape photography highlights
Pentax K-S1 Landscape photography highlights
60
you can focus manually
change lenses (Micro Four Thirds mount)
screen size is good (3 inch)
has image stabilization (Sensor based)
sensor size is decent (Four Thirds)
delivers RAW files
megapixel count low (12MP)
terrible battery life (300 CIPA)
lack of Time Lapse mode
73
you can focus manually
switch lenses (Pentax KAF2 mount)
good sized screen (3")
has image stabilization (Sensor based)
MP count good (20MP)
nice sensor size (APS-C)
does not have anti-alias filter
great ISO range (51,200)
delivers RAW formats
bad battery life (410 shots)
doesn't have Timelapse mode
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Vlogging Comparison

Olympus E-P1 Vlogging information
Pentax K-S1 Vlogging information
29
has image stabilization (Sensor based)
offers face detect focusing
screen isn't selfie friendly
low res video (1280 x 720 resolution)
lack of mic support
33
has image stabilization (Sensor based)
features face detection focusing
high video quality (1920 x 1080 pxls)
lighter than average (558g)
display is not selfie friendly
doesn't have external microphone support
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Olympus E-P1 vs Pentax K-S1 Specifications

Detailed spec comparison table for Olympus E-P1 and Pentax K-S1
 Olympus PEN E-P1Pentax K-S1
General Information
Company Olympus Pentax
Model type Olympus PEN E-P1 Pentax K-S1
Class Entry-Level Mirrorless Advanced DSLR
Launched 2009-07-29 2014-08-27
Physical type Rangefinder-style mirrorless Mid-size SLR
Sensor Information
Powered by TruePic V Prime MII
Sensor type CMOS CMOS
Sensor size Four Thirds APS-C
Sensor measurements 17.3 x 13mm 23.5 x 15.6mm
Sensor area 224.9mm² 366.6mm²
Sensor resolution 12MP 20MP
Anti alias filter
Aspect ratio 1:1, 4:3, 3:2 and 16:9 3:2
Max resolution 4032 x 3024 5472 x 3648
Max native ISO 6400 51200
Min native ISO 100 100
RAW data
Autofocusing
Manual focusing
Autofocus touch
Continuous autofocus
Single autofocus
Tracking autofocus
Autofocus selectice
Autofocus center weighted
Autofocus multi area
Live view autofocus
Face detect autofocus
Contract detect autofocus
Phase detect autofocus
Total focus points 11 11
Lens
Lens mount type Micro Four Thirds Pentax KAF2
Number of lenses 107 151
Focal length multiplier 2.1 1.5
Screen
Type of display Fixed Type Fixed Type
Display sizing 3 inches 3 inches
Display resolution 230 thousand dots 921 thousand dots
Selfie friendly
Liveview
Touch display
Display tech HyperCrystal LCD with AR(Anti-Reflective) coating -
Viewfinder Information
Viewfinder None Optical (pentaprism)
Viewfinder coverage - 100%
Viewfinder magnification - 0.64x
Features
Minimum shutter speed 60s 30s
Fastest shutter speed 1/4000s 1/6000s
Continuous shutter rate 3.0 frames/s 5.4 frames/s
Shutter priority
Aperture priority
Manual mode
Exposure compensation Yes Yes
Custom white balance
Image stabilization
Integrated flash
Flash distance no built-in flash 10.00 m (at ISO 100)
Flash settings Auto, On, Off, Red-Eye, Fill-in, Slow Sync, Manual (3 levels) Auto, auto + redeye, on, on + redeye reduction, slow sync, trailing curtain sync, manual
External flash
AEB
WB bracketing
Fastest flash synchronize 1/180s -
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
Video features
Supported video resolutions 1280 x 720 (30 fps), 640 x 480 (30 fps) 1920 x 1080 (30,25,24 fps), 1280 x 720 (60,50 fps)
Max video resolution 1280x720 1920x1080
Video format Motion JPEG H.264
Microphone support
Headphone support
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 proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 355 grams (0.78 lbs) 558 grams (1.23 lbs)
Physical dimensions 121 x 70 x 36mm (4.8" x 2.8" x 1.4") 121 x 93 x 70mm (4.8" x 3.7" x 2.8")
DXO scores
DXO Overall rating 55 78
DXO Color Depth rating 21.4 23.5
DXO Dynamic range rating 10.4 13.0
DXO Low light rating 536 1061
Other
Battery life 300 pictures 410 pictures
Battery style Battery Pack Battery Pack
Battery ID BLS-1 D-LI109
Self timer Yes (2 or 12 sec) Yes ( 2 or 12 seconds)
Time lapse shooting
Storage type SD/SDHC card SD/SDHC/SDXC
Card slots Single Single
Retail price $182 $339