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Olympus E-PM2 vs Sony A77 II

The Olympus PEN E-PM2 and the Sony Alpha SLT-A77 II are two digital cameras that were announced, respectively, in September 2012 and May 2014. The E-PM2 is a mirrorless interchangeable lens camera, while the A77 II is a DSLR. The cameras are based on a Four Thirds (E-PM2) and an APS-C (A77 II) sensor. The Olympus has a resolution of 15.9 megapixels, whereas the Sony provides 24 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Olympus E-PM2   VS Sony A77 II
Olympus E-PM2 Sony A77 II
Mirrorless system camera Digital single lens reflex
Micro Four Thirds lenses Sony A mount lenses
15.9 MP, Four Thirds Sensor 24 MP, APS-C Sensor
1080/30p Video 1080/60p Video
ISO 100-25600 ISO 100-25600 (50-51200)
Viewfinder optional Electronic viewfinder (2359k dots)
3.0" LCD, 460k dots 3.0" LCD, 1229k dots
Fixed touchscreen Fully flexible screen (no touchscreen)
8 shutter flaps per second 12 shutter flaps per second
In-body stabilizationIn-body stabilization
Not weather sealedWeathersealed body
360 shots per battery charge480 shots per battery charge
110 x 64 x 34 mm, 269 g 143 x 104 x 81 mm, 647 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Olympus PEN E-PM2 and the Sony Alpha SLT-A77 II? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.

Body comparison

The physical size and weight of the Olympus E-PM2 and the Sony A77 II are illustrated in the side-by-side display below. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All width, height and depth dimensions are rounded to the nearest millimeter.

The E-PM2 can be obtained in four different colors (black, silver, red, white), while the A77 II is only available in black.

Size Olympus E-PM2 vs Sony A77 II
Compare E-PM2 versus A77 II top
Comparison E-PM2 or A77 II rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A77 II is considerably larger (111 percent) than the Olympus E-PM2. Moreover, the A77 II is substantially heavier (141 percent) than the E-PM2. It is noteworthy in this context that the A77 II is splash and dust-proof, while the E-PM2 does not feature any corresponding weather-sealing.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the E-PM2 gets 360 shots out of its BLS-5 battery, while the A77 II can take 480 images on a single charge of its NP-FM500H power pack.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you want to switch the focus of the display and review another camera pair, just select a new right or left comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

Camera Body Specifications
  Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(yes/no)
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Camera
Model
 
Olympus E-PM2» 4.3 in 2.5 in 1.3 in 9.5 oz 360 n Sep 2012 499iOlympus E-PM2
 
Sony A77 II« 5.6 in 4.1 in 3.2 in 22.8 oz 480 Y May 2014 1,199 iSony A77 II
 
Nikon D7200« » 5.4 in 4.2 in 3.0 in 27.0 oz 1110 Y Mar 2015 1,199iNikon D7200
 
Nikon D7100« » 5.4 in 4.2 in 3.0 in 27.0 oz 950 Y Feb 2013 1,199iNikon D7100
 
Olympus E-PL9« » 4.6 in 2.7 in 1.5 in 13.4 oz 350 n Feb 2018 599 iOlympus E-PL9
 
Olympus E-PL8« » 4.5 in 2.6 in 1.5 in 12.6 oz 350 n Sep 2016 549iOlympus E-PL8
 
Olympus E-M10 II« » 4.7 in 3.3 in 1.9 in 13.8 oz 320 n Aug 2015 649iOlympus E-M10 II
 
Olympus E-PL7« » 4.5 in 2.6 in 1.5 in 12.6 oz 350 n Aug 2014 599iOlympus E-PL7
 
Olympus E-P5« » 4.8 in 2.7 in 1.5 in 14.8 oz 330 n May 2013 999iOlympus E-P5
 
Olympus E-PL6« » 4.4 in 2.5 in 1.5 in 11.5 oz 360 n May 2013 599iOlympus E-PL6
 
Olympus E-PL5« » 4.4 in 2.5 in 1.5 in 11.5 oz 360 n Sep 2012 599iOlympus E-PL5
 
Olympus E-PL3« » 4.3 in 2.5 in 1.5 in 11.0 oz 300 n Jun 2011 599iOlympus E-PL3
 
Olympus E-PM1« » 4.3 in 2.5 in 1.3 in 9.3 oz 330 n Jun 2011 499iOlympus E-PM1
 
Panasonic GX850« » 4.2 in 2.6 in 1.3 in 9.5 oz 210 n Jan 2017 549 iPanasonic GX850
 
Sony A68« » 5.6 in 4.1 in 3.2 in 21.5 oz 540 n Nov 2015 699iSony A68
 
Sony A7 II« » 5.0 in 3.8 in 2.4 in 21.1 oz 350 Y Nov 2014 1,999iSony A7 II
 
Sony A77« » 5.6 in 4.1 in 3.2 in 25.8 oz 470 Y Aug 2011 1,399iSony A77
Note: Measurements and pricing do not include easily detachable parts, such as interchangeable lenses or optional viewfinders.

Any camera decision will naturally be influenced heavily by the price. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The E-PM2 was launched at a markedly lower price (by 58 percent) than the A77 II, which puts it into a different market segment. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down.

 

Sensor comparison

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Olympus E-PM2 features a Four Thirds sensor and the Sony A77 II an APS-C sensor. The sensor area in the A77 II is 63 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.0 and 1.5. The sensor in the E-PM2 has a native 4:3 aspect ratio, while the one in the A77 II offers a 3:2 aspect.

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors.

Olympus E-PM2 and Sony A77 II sensor measures

With 24MP, the A77 II offers a higher resolution than the E-PM2 (15.9MP), but the A77 II nevertheless has larger individual pixels (pixel pitch of 3.91μm versus 3.76μm for the E-PM2) due to its larger sensor. Moreover, the A77 II is a somewhat more recent model (by 1 year and 7 months) than the E-PM2, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units.

The resolution advantage of the Sony A77 II implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A77 II for good quality output (200 dots per inch) amounts to 30 x 20 inch or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inch or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inch or 50.8 x 33.9 cm. The corresponding values for the Olympus E-PM2 are 23 x 17.3 inch or 58.5 x 43.9 cm for good quality, 18.4 x 13.8 inch or 46.8 x 35.1 cm for very good quality, and 15.4 x 11.5 inch or 39 x 29.3 cm for excellent quality prints.

The Olympus PEN E-PM2 has a native sensitivity range from ISO 100 to ISO 25600. The corresponding ISO settings for the Sony Alpha SLT-A77 II are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 50-51200.

E-PM2 versus A77 II MP

For many cameras, data on sensor performance has been reported by DXO Mark. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

Sensor Characteristics
  Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Camera
Model
 
Olympus E-PM2 Four Thirds 15.9 4608 34561080/30p22.712.293272Olympus E-PM2
 
Sony A77 II APS-C 24.0 6000 40001080/60p........Sony A77 II
 
Nikon D7200 APS-C 24.0 6000 40001080/60p24.514.6133387Nikon D7200
 
Nikon D7100 APS-C 24.0 6000 40001080/60p24.213.7125683Nikon D7100
 
Olympus E-PL9 Four Thirds 15.9 4608 34564K/30p........Olympus E-PL9
 
Olympus E-PL8 Four Thirds 15.9 4608 34561080/30p........Olympus E-PL8
 
Olympus E-M10 II Four Thirds 15.9 4608 34561080/60p23.112.584273Olympus E-M10 II
 
Olympus E-PL7 Four Thirds 15.9 4608 34561080/30p22.712.487372Olympus E-PL7
 
Olympus E-P5 Four Thirds 15.9 4608 34561080/30p22.812.489572Olympus E-P5
 
Olympus E-PL6 Four Thirds 15.9 4608 34561080/30p........Olympus E-PL6
 
Olympus E-PL5 Four Thirds 15.9 4608 34561080/30p22.812.388972Olympus E-PL5
 
Olympus E-PL3 Four Thirds 12.2 4032 30241080/60i20.910.349952Olympus E-PL3
 
Olympus E-PM1 Four Thirds 12.2 4032 30241080/60i21.010.349952Olympus E-PM1
 
Panasonic GX850 Four Thirds 15.8 4592 34484K/30p23.213.358673Panasonic GX850
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.570179Sony A68
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990Sony A7 II
 
Sony A77 APS-C 24.0 6000 40001080/60p24.013.280178Sony A77

Many modern cameras are not only capable of taking still images, but can also record movies. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the A77 II provides a faster frame rate than the E-PM2. It can shoot movie footage at 1080/60p, while the Olympus is limited to 1080/30p.

 

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the A77 II has an electronic viewfinder (2359k dots), which can be very helpful when shooting in bright sunlight. In contrast, the E-PM2 relies on live view and the rear LCD for framing. That said, the E-PM2 can be equipped with an optional viewfinder – the VF-4. The adjacent table lists some of the other core features of the Olympus E-PM2 and Sony A77 II along with similar information for a selection of comparators.

Core Features
  Camera
Model
Viewfinder
(Type or
'000 dots)
Control
Panel
(yes/no)
LCD
Size
(inch)
LCD
Resolution
('000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Mech
Shutter
Speed
Shutter
Flaps
(1/sec)
Built-in
Flash
(yes/no)
Built-in
Image
Stab
Camera
Model
 
Olympus E-PM2optional n 3.0 460 fixed Y 1/4000s 8.0 n Y Olympus E-PM2
 
Sony A77 II2359 Y 3.0 1229 full-flex n 1/8000s 12.0 Y Y Sony A77 II
 
Nikon D7200optical Y 3.2 1229 fixed n 1/8000s 6.0 Y n Nikon D7200
 
Nikon D7100optical Y 3.2 1229 fixed n 1/8000s 6.0 Y n Nikon D7100
 
Olympus E-PL9none n 3.0 1040 tilting Y 1/4000s 8.6 Y Y Olympus E-PL9
 
Olympus E-PL8none n 3.0 1037 tilting Y 1/4000s 8.0 n Y Olympus E-PL8
 
Olympus E-M10 II2360 n 3.0 1040 tilting Y 1/4000s 8.0 Y Y Olympus E-M10 II
 
Olympus E-PL7optional n 3.0 1037 tilting Y 1/4000s 8.0 n Y Olympus E-PL7
 
Olympus E-P5optional n 3.0 1037 tilting Y 1/8000s 9.0 Y Y Olympus E-P5
 
Olympus E-PL6optional n 3.0 460 tilting Y 1/4000s 8.0 n Y Olympus E-PL6
 
Olympus E-PL5optional n 3.0 460 tilting Y 1/4000s 8.0 n Y Olympus E-PL5
 
Olympus E-PL3optional n 3.0 460 tilting n 1/4000s 5.5 n Y Olympus E-PL3
 
Olympus E-PM1optional n 3.0 460 fixed n 1/4000s 5.5 n Y Olympus E-PM1
 
Panasonic GX850none n 3.0 1040 tilting Y 1/500s 10.0 Y n Panasonic GX850
 
Sony A681440 Y 2.7 460 tilting n 1/4000s 8.0 Y Y Sony A68
 
Sony A7 II2400 n 3.0 1230 tilting n 1/8000s 5.0 n Y Sony A7 II
 
Sony A772359 Y 3.0 921 full-flex n 1/8000s 12.0 Y Y Sony A77

One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The E-PM2 has a touchscreen, while the A77 II has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.

The A77 II has an articulated screen that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in taking selfies. In contrast, the E-PM2 does not have a selfie-screen.

The E-PM2 writes its imaging data to SDXC cards, while the A77 II uses SDXC or Memory Stick PRO Duo cards. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

 

Connectivity comparison

For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Olympus PEN E-PM2 and Sony Alpha SLT-A77 II and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

Input-Output Connections
  Camera
Model
Hotshoe
Port
Internal
Microphone
Internal
Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
Camera
Model
 
Olympus E-PM2Ystereomono--mini2.0---Olympus E-PM2
 
Sony A77 IIYstereomonoY-mini2.0YY-Sony A77 II
 
Nikon D7200YstereomonoYYmini2.0YY-Nikon D7200
 
Nikon D7100YstereomonoYYmini2.0---Nikon D7100
 
Olympus E-PL9Ystereomono--micro2.0Y-YOlympus E-PL9
 
Olympus E-PL8Ystereomono--micro2.0Y--Olympus E-PL8
 
Olympus E-M10 IIYstereomono--micro2.0Y--Olympus E-M10 II
 
Olympus E-PL7Ystereomono--micro2.0Y--Olympus E-PL7
 
Olympus E-P5Ystereomono--micro2.0Y--Olympus E-P5
 
Olympus E-PL6Ystereomono--mini2.0---Olympus E-PL6
 
Olympus E-PL5Ystereomono--mini2.0---Olympus E-PL5
 
Olympus E-PL3Ystereonone--mini2.0---Olympus E-PL3
 
Olympus E-PM1Ystereomono--mini2.0---Olympus E-PM1
 
Panasonic GX850-stereomono--micro2.0Y--Panasonic GX850
 
Sony A68YstereomonoY-micro2.0---Sony A68
 
Sony A7 IIYstereomonoYYmicro2.0YY-Sony A7 II
 
Sony A77YstereomonoY-mini2.0---Sony A77

It is notable that the A77 II offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the E-PM2 does not offer wifi capability.

Studio photographers will appreciate that the Sony A77 II (unlike the E-PM2) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

The A77 II is a recent model that features in the current product line-up of Sony. In contrast, the E-PM2 has been discontinued (but it can be found pre-owned on eBay). There has not been a direct replacement model for the E-PM2 from Olympus. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Olympus and Sony websites.

Review summary

So what is the bottom line? Which of the two cameras – the Olympus E-PM2 or the Sony A77 II – has the upper hand? Is one clearly better than the other? The listing below highlights the relative strengths of the two models.

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Arguments in favor of the Olympus PEN E-PM2:

  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • More compact: Is smaller (110x64mm vs 143x104mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 378g or 58 percent) and hence easier to carry around.
  • More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
  • More affordable: Was introduced into a lower priced category (58 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in September 2012).

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Advantages of the Sony Alpha SLT-A77 II:

  • More detail: Has more megapixels (24 vs 15.9MP), which boosts linear resolution by 25%.
  • Better image quality: Is equipped with a larger and more technologically advanced sensor.
  • Richer colors: The sensor size advantage translates into images with better, more accurate colors.
  • More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
  • Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
  • Better video: Provides higher movie framerates (1080/60p versus 1080/30p).
  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Easier framing: Has an electronic viewfinder for image composition and settings control.
  • Easier setting verification: Features a control panel on top to check shooting parameters.
  • More detailed LCD: Has a higher resolution rear screen (1229k vs 460k dots).
  • More flexible LCD: Has a full-flex screen for odd-angle shots in portrait or landscape orientation.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (12 vs 8 flaps/sec) to capture the decisive moment.
  • Longer lasting: Gets more shots (480 versus 360) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • More modern: Was introduced somewhat (1 year and 7 months) more recently.

If the number of relative strengths (bullet points above) is taken as a guide, the A77 II is the clear winner of the contest (21 : 6 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding on a new camera. A professional wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

E-PM2 06:21 A77 II

How about other alternatives? Do the specifications of the Olympus E-PM2 and the Sony A77 II place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best DSLR Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains incomplete and does no justice, for example, to the way the E-PM2 or the A77 II perform in practice. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is where reviews by experts come in. The following table reports the overall ratings of the cameras as published by some of the major camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, and photographyblog). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

Review Scores
  Camera
Model
cam
era
  labs  
dp
re
  view  
e
photo
  zine  
ima
ging
resource
photo
graphy
  blog  
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Camera
Model
 
Olympus E-PM2..77/1005/54.5/54.5/5 Sep 2012 499iOlympus E-PM2
 
Sony A77 II..80/1004.5/54/55/5 May 2014 1,199 iSony A77 II
 
Nikon D7200+ +84/1004.5/54/54.5/5 Mar 2015 1,199iNikon D7200
 
Nikon D7100+ +85/1004.5/55/54.5/5 Feb 2013 1,199iNikon D7100
 
Olympus E-PL9+..4.5/54.5/54/5 Feb 2018 599 iOlympus E-PL9
 
Olympus E-PL8....4.5/5..4/5 Sep 2016 549iOlympus E-PL8
 
Olympus E-M10 II+ +80/1005/55/55/5 Aug 2015 649iOlympus E-M10 II
 
Olympus E-PL7+..5/54.5/54/5 Aug 2014 599iOlympus E-PL7
 
Olympus E-P5+ +78/1004.5/54.5/55/5 May 2013 999iOlympus E-P5
 
Olympus E-PL6.......... May 2013 599iOlympus E-PL6
 
Olympus E-PL5+ +..4.5/54.5/54.5/5 Sep 2012 599iOlympus E-PL5
 
Olympus E-PL3+ +72/1004.5/5..4/5 Jun 2011 599iOlympus E-PL3
 
Olympus E-PM186/10071/1004.5/5..4.5/5 Jun 2011 499iOlympus E-PM1
 
Panasonic GX850+76/1004.5/54/54.5/5 Jan 2017 549 iPanasonic GX850
 
Sony A68....4/5..4/5 Nov 2015 699iSony A68
 
Sony A7 II+82/1004.5/55/55/5 Nov 2014 1,999iSony A7 II
 
Sony A7791/10081/100..4.5/55/5 Aug 2011 1,399iSony A77
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The ratings are only valid when referring to cameras in the same category and of the same age. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparisons of ratings among very different cameras or across long time periods have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

Olympus E-PM2:
Check Ebay offers
Sony A77 II:
Check Amazon price

Other camera comparisons

Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just make your choice using the following search menu. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

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    Specifications: Olympus E-PM2 vs Sony A77 II

    Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.

    Camera Specifications
    Camera Model Olympus E-PM2 Sony A77 II
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Micro Four Thirds lenses Sony A mount lenses
    Launch Date September 2012 May 2014
    Launch Price USD 499 USD 1199
    Sensor Specs Olympus E-PM2 Sony A77 II
    Sensor Technology CMOS CMOS
    Sensor Format Four Thirds Sensor APS-C Sensor
    Sensor Size 17.3 x 13.0 mm 23.5 x 15.6 mm
    Sensor Area 224.9 mm2 366.6 mm2
    Sensor Diagonal 21.6 mm 28.2 mm
    Crop Factor 2.0x 1.5x
    Sensor Resolution 15.9 Megapixels 24 Megapixels
    Image Resolution 4608 x 3456 pixels 6000 x 4000 pixels
    Pixel Pitch 3.76 μm 3.91 μm
    Pixel Density 7.08 MP/cm2 6.55 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability 1080/30p Video 1080/60p Video
    ISO Setting 100-25600 ISO 100-25600 ISO
    ISO Boost no Enhancement 50-51200 ISO
    Image Processor TruePic VI BIONZ X
    DXO Sensor Quality (score) 72 ..
    DXO Color Depth (bits) 22.7 ..
    DXO Dynamic Range (EV) 12.2 ..
    DXO Low Light (ISO) 932 ..
    Screen Specs Olympus E-PM2 Sony A77 II
    Viewfinder Type Viewfinder optional Electronic viewfinder
    Viewfinder Field of View 100%
    Viewfinder Magnification 0.73x
    Viewfinder Resolution 2359k dots
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0 inch 3.0 inch
    LCD Resolution 460k dots 1229k dots
    LCD Attachment Fixed screen Fully flexible screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Olympus E-PM2 Sony A77 II
    Autofocus System Contrast-detect AF Phase-detect AF
    Manual Focusing AidNo Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/4000/s 1/8000/s
    Continuous Shooting 8 shutter flaps/s 12 shutter flaps/s
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash no On-Board Flash Build-in Flash
    Storage Medium SDXC cards MS or SDXC cards
    Second Storage Option Single card slot Single card slot
    UHS card support UHS-I UHS-I
    Connectivity Specs Olympus E-PM2 Sony A77 II
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 2.0
    HDMI Port mini HDMI mini HDMI
    Microphone Port no MIC socket External MIC port
    Wifi Support no Wifi Wifi built-in
    Near-Field Communication no NFC NFC built-in
    Body Specs Olympus E-PM2 Sony A77 II
    Environmental SealingNot weather sealedWeathersealed body
    Battery Type BLS-5 NP-FM500H
    Battery Life (CIPA)360 shots per charge480 shots per charge
    Body Dimensions 110 x 64 x 34 mm
    (4.3 x 2.5 x 1.3 in)
    143 x 104 x 81 mm
    (5.6 x 4.1 x 3.2 in)
    Camera Weight 269 g (9.5 oz) 647 g (22.8 oz)

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