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Olympus E-PM1 vs Pentax K-S1

Portability
89
Imaging
48
Features
52
Overall
49
Olympus PEN E-PM1 front
 
Pentax K-S1 front
Portability
69
Imaging
63
Features
70
Overall
65

Olympus E-PM1 vs Pentax K-S1 Key Specs

Olympus E-PM1
(Full Review)
  • 12MP - Four Thirds Sensor
  • 3" Fixed Display
  • ISO 100 - 12800
  • Sensor based Image Stabilization
  • 1920 x 1080 video
  • Micro Four Thirds Mount
  • 265g - 110 x 64 x 34mm
  • Introduced November 2011
  • Refreshed by Olympus E-PM2
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 Maximum Shutter
  • 1920 x 1080 video
  • Pentax KAF2 Mount
  • 558g - 121 x 93 x 70mm
  • Announced August 2014
  • Replacement is Pentax K-S2
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Olympus E-PM1 vs Pentax K-S1 Overview

Here is a extended analysis of the Olympus E-PM1 vs Pentax K-S1, former being a Entry-Level Mirrorless while the latter is a Advanced DSLR by companies Olympus and Pentax. There is a considerable difference between the sensor resolutions of the E-PM1 (12MP) and K-S1 (20MP) and the E-PM1 (Four Thirds) and K-S1 (APS-C) provide totally different sensor sizing.

Photography Glossary

The E-PM1 was unveiled 3 years prior to the K-S1 and that is quite a large difference as far as tech is concerned. Each of the cameras have different body design with the Olympus E-PM1 being a Rangefinder-style mirrorless camera and the Pentax K-S1 being a Mid-size SLR camera.

Before delving into a complete comparison, here is a quick summation of how the E-PM1 matches up vs the K-S1 in the way of portability, imaging, features and an overall rating.

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Reasons to pick Olympus E-PM1 over the Pentax K-S1

 E-PM1 K-S1 

Reasons to pick Pentax K-S1 over the Olympus E-PM1

 K-S1 E-PM1 
AnnouncedAugust 2014November 2011Fresher by 33 months
Screen resolution921k460kCrisper screen (+461k dot)

Common features in the Olympus E-PM1 and Pentax K-S1

 E-PM1 K-S1 
Manual focus More precise focus
Screen typeFixed Fixed Fixed screen
Screen dimensions3"3"Equal screen measurement
Selfie screen Lack of selfie screen
Touch screen Neither offers Touch screen

Olympus E-PM1 vs Pentax K-S1 Physical Comparison

If you are planning to carry your camera, you're going to have to factor its weight and proportions. The Olympus E-PM1 offers outside measurements of 110mm x 64mm x 34mm (4.3" x 2.5" x 1.3") along with a weight of 265 grams (0.58 lbs) while the Pentax K-S1 has measurements of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") with a weight of 558 grams (1.23 lbs).

Look at the Olympus E-PM1 vs Pentax K-S1 in our brand new Camera plus Lens Size Comparison Tool. Camera Size Comparison with Lenses

Take into account, the weight of an ILC will vary dependant on the lens you are working with at that moment. The following is a front view sizing comparison of the E-PM1 compared to the K-S1.

Olympus E-PM1 vs Pentax K-S1 size comparison

Taking into account size and weight, the portability grade of the E-PM1 and K-S1 is 89 and 69 respectively.

Olympus E-PM1 vs Pentax K-S1 top view buttons comparison

Olympus E-PM1 vs Pentax K-S1 Sensor Comparison

Usually, its hard to envision the contrast between sensor sizing only by going over technical specs. The visual below should offer you a more clear sense of the sensor sizing in the E-PM1 and K-S1.

As you have seen, both of those cameras have different megapixels and different sensor sizing. The E-PM1 using its tinier sensor will make achieving shallower depth of field more challenging and the Pentax K-S1 will offer you more detail having an extra 8MP. Higher resolution will let you crop photographs a bit more aggressively. The older E-PM1 is going to be behind with regard to sensor technology.

Olympus E-PM1 vs Pentax K-S1 sensor size comparison

Olympus E-PM1 vs Pentax K-S1 Screen and ViewFinder

Olympus E-PM1 vs Pentax K-S1 Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Olympus E-PM1 Portrait photography details
Pentax K-S1 Portrait photography details
60
has manual focus
sensor size is nice (Four Thirds)
includes face detect focus
supports RAW formats
low resolution (12 megapixels)
77
focusing manually
good megapixels (20MP)
good sensor size (APS-C)
has face detect focusing
supports RAW formats
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Street Comparison

Street photography with Olympus E-PM1
Street photography with Pentax K-S1
75
image stabilization (Sensor based)
sensor size is nice (Four Thirds)
supports RAW formats
no articulating screen
73
image stabilization (Sensor based)
good sensor size (APS-C)
supports RAW formats
lighter than others (558 grams)
great ISO range (51,200)
no articulating screen
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Sports Comparison

Olympus E-PM1 Sports photography info
Pentax K-S1 Sports photography info
49
image stabilization (Sensor based)
sensor size is nice (Four Thirds)
includes tracking focus
low fps (6.0 fps)
low resolution (12MP)
has no phase detect auto focus
69
max shutter speed is good (1/6,000s)
image stabilization (Sensor based)
good megapixels (20 megapixels)
good sensor size (APS-C)
has tracking focus
sensor has phase detect AF
slow continuous shooting (5.4 frames/s)
not so great battery pack (410 CIPA)
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Travel Comparison

Olympus E-PM1 Travel photography details
Pentax K-S1 Travel photography details
45
no Timelapse mode
low resolution (12MP)
display is not selfie friendly
60
lighter than others (558g)
good megapixels (20 megapixels)
has built in flash
does not have Timelapse mode
not so great battery pack (410 per charge)
display is not selfie friendly
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Landscape Comparison

Olympus E-PM1 Landscape photography factors
Pentax K-S1 Landscape photography factors
65
has manual focus
interchangeable lenses (Micro Four Thirds mount)
screen is a good size (3 inch)
image stabilization (Sensor based)
sensor size is nice (Four Thirds)
supports RAW formats
low resolution (12MP)
no Timelapse mode
73
focusing manually
switch lenses (Pentax KAF2 mount)
pretty good screen size (3 inches)
image stabilization (Sensor based)
good megapixels (20 megapixels)
good sensor size (APS-C)
doesnt have anti-alias filter
great ISO range (51,200)
supports RAW formats
not so great battery pack (410 shots)
does not have Timelapse mode
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Vlogging Comparison

Olympus E-PM1 Vlogging info
Pentax K-S1 Vlogging info
34
image stabilization (Sensor based)
includes face detect focus
video resolution high (1920 x 1080 resolution)
display is not selfie friendly
no microphone jack
33
image stabilization (Sensor based)
has face detect focusing
video res high (1920 x 1080 resolution)
lighter than others (558g)
display is not selfie friendly
does not have microphone support
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Olympus E-PM1 vs Pentax K-S1 Specifications

Detailed spec comparison table for Olympus E-PM1 and Pentax K-S1
 Olympus PEN E-PM1Pentax K-S1
General Information
Brand Olympus Pentax
Model type Olympus PEN E-PM1 Pentax K-S1
Class Entry-Level Mirrorless Advanced DSLR
Introduced 2011-11-23 2014-08-27
Physical type Rangefinder-style mirrorless Mid-size SLR
Sensor Information
Processor Chip TruePic VI Prime MII
Sensor type CMOS CMOS
Sensor size Four Thirds APS-C
Sensor measurements 17.3 x 13mm 23.5 x 15.6mm
Sensor surface area 224.9mm² 366.6mm²
Sensor resolution 12MP 20MP
Anti alias filter
Aspect ratio 4:3 3:2
Highest Possible resolution 4032 x 3024 5472 x 3648
Maximum native ISO 12800 51200
Min native ISO 100 100
RAW data
Autofocusing
Manual focusing
Autofocus touch
Autofocus continuous
Single autofocus
Autofocus tracking
Autofocus selectice
Autofocus center weighted
Multi area autofocus
Live view autofocus
Face detect autofocus
Contract detect autofocus
Phase detect autofocus
Total focus points 35 11
Lens
Lens support Micro Four Thirds Pentax KAF2
Total lenses 107 151
Focal length multiplier 2.1 1.5
Screen
Type of display Fixed Type Fixed Type
Display size 3 inch 3 inch
Resolution of display 460 thousand dots 921 thousand dots
Selfie friendly
Liveview
Touch display
Display tech HyperCrystal LCD AR(Anti-Reflective) coating -
Viewfinder Information
Viewfinder Electronic (optional) Optical (pentaprism)
Viewfinder coverage - 100%
Viewfinder magnification - 0.64x
Features
Min shutter speed 60s 30s
Max shutter speed 1/4000s 1/6000s
Continuous shutter rate 6.0fps 5.4fps
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation Yes Yes
Change white balance
Image stabilization
Built-in 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
AE bracketing
WB bracketing
Max flash synchronize 1/160s -
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
Video features
Supported video resolutions 1920 x 1080 (60 fps), 1280 x 720 (60, 30 fps), 640 x 480 (30 fps) 1920 x 1080 (30,25,24 fps), 1280 x 720 (60,50 fps)
Maximum video resolution 1920x1080 1920x1080
Video data format AVCHD, 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 265 grams (0.58 lbs) 558 grams (1.23 lbs)
Physical dimensions 110 x 64 x 34mm (4.3" x 2.5" x 1.3") 121 x 93 x 70mm (4.8" x 3.7" x 2.8")
DXO scores
DXO Overall rating 52 78
DXO Color Depth rating 21.0 23.5
DXO Dynamic range rating 10.3 13.0
DXO Low light rating 499 1061
Other
Battery life 330 pictures 410 pictures
Battery style Battery Pack Battery Pack
Battery ID BLS-5 D-LI109
Self timer Yes (2 or 12 sec) Yes ( 2 or 12 seconds)
Time lapse shooting
Storage type SD/SDHC/SDXC SD/SDHC/SDXC
Card slots One One
Retail cost $499 $339