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Olympus E-P3 vs Sony A99

The Olympus PEN E-P3 and the Sony Alpha SLT-A99 are two digital cameras that were revealed to the public, respectively, in June 2011 and September 2012. The E-P3 is a mirrorless interchangeable lens camera, while the A99 is a DSLR. The cameras are based on a Four Thirds (E-P3) and a full frame (A99) sensor. The Olympus has a resolution of 12.2 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-P3   VS Sony A99
Olympus E-P3 Sony A99
Mirrorless system camera Digital single lens reflex
Micro Four Thirds lenses Sony A mount lenses
12.2 MP, Four Thirds Sensor 24 MP, Full Frame Sensor
1080/60i Video 1080/60p Video
ISO 200-12800 ISO 100-25600
Viewfinder optional Electronic viewfinder (2359k dots)
3.0" LCD, 614k dots 3.0" LCD, 1229k dots
Fixed touchscreen Fully flexible screen (no touchscreen)
3 shutter flaps per second 6 shutter flaps per second
In-body stabilizationIn-body stabilization
Not weather sealedWeathersealed body
330 shots per battery charge500 shots per battery charge
122 x 69 x 34 mm, 369 g 147 x 111 x 78 mm, 812 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Olympus PEN E-P3 and the Sony Alpha SLT-A99? 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

An illustration of the physical size and weight of the Olympus E-P3 and the Sony A99 is provided 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 measures are rounded to the nearest millimeter.

The E-P3 can be obtained in three different colors (black, silver, white), while the A99 is only available in black.

Size Olympus E-P3 vs Sony A99
Compare E-P3 versus A99 top
Comparison E-P3 or A99 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A99 is considerably larger (94 percent) than the Olympus E-P3. Moreover, the A99 is substantially heavier (120 percent) than the E-P3. It is noteworthy in this context that the A99 is splash and dust-proof, while the E-P3 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-P3 gets 330 shots out of its BLS-5 battery, while the A99 can take 500 images on a single charge of its NP-FM500H power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. In case you want to display and compare another camera duo, just click on the right or left arrow next to the camera that you would like to inspect. Alternatively, you can also use the CAM-parator to select your camera combination among a larger number of options.

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-P3» 4.8 in 2.7 in 1.3 in 13.0 oz 330 n Jun 2011 799iOlympus E-P3
 
Sony A99« 5.8 in 4.4 in 3.1 in 28.6 oz 500 Y Sep 2012 2,799iSony A99
 
Olympus E-P5« » 4.8 in 2.7 in 1.5 in 14.8 oz 330 n May 2013 999iOlympus E-P5
 
Olympus E-PL5« » 4.4 in 2.5 in 1.5 in 11.5 oz 360 n Sep 2012 599iOlympus E-PL5
 
Olympus E-PL2« » 4.5 in 2.8 in 1.7 in 12.8 oz 280 n Jan 2011 599iOlympus E-PL2
 
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
 
Olympus E-PL1« » 4.5 in 2.8 in 1.7 in 11.8 oz 290 n Feb 2010 599iOlympus E-PL1
 
Olympus E-P1« » 4.8 in 2.8 in 1.4 in 12.5 oz 300 n Jun 2009 799iOlympus E-P1
 
Olympus E-P2« » 4.8 in 2.8 in 1.4 in 12.5 oz 300 n Nov 2009 799iOlympus E-P2
 
Panasonic GX1« » 4.6 in 2.7 in 1.5 in 11.2 oz 320 n Nov 2011 699iPanasonic GX1
 
Panasonic G10« » 4.9 in 3.3 in 2.9 in 13.7 oz 380 n Mar 2010 499iPanasonic G10
 
Sony A99 II« » 5.6 in 4.1 in 3.0 in 29.9 oz 490 Y Sep 2016 3,199 iSony A99 II
 
Sony A7R II« » 5.0 in 3.8 in 2.4 in 22.0 oz 290 Y Jun 2015 3,199iSony A7R II
 
Sony A77« » 5.6 in 4.1 in 3.2 in 25.8 oz 470 Y Aug 2011 1,399iSony A77
 
Sony A850« » 6.1 in 4.6 in 3.2 in 31.6 oz 880 Y Aug 2009 1,999iSony A850
 
Sony A900« » 6.1 in 4.6 in 3.2 in 31.6 oz 880 Y Sep 2008 2,999iSony A900
Note: Measurements and pricing do not include easily detachable parts, such as interchangeable lenses or optional viewfinders.

Any camera decision will obviously take relative prices into account. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The E-P3 was launched at a markedly lower price (by 71 percent) than the A99, 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 tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Olympus E-P3 features a Four Thirds sensor and the Sony A99 a full frame sensor. The sensor area in the A99 is 279 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.0 and 1.0. The sensor in the E-P3 has a native 4:3 aspect ratio, while the one in the A99 offers a 3:2 aspect.

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

Olympus E-P3 and Sony A99 sensor measures

With 24MP, the A99 offers a higher resolution than the E-P3 (12.2MP), but the A99 nevertheless has larger individual pixels (pixel pitch of 5.96μm versus 4.29μm for the E-P3) due to its larger sensor. Moreover, the A99 is a somewhat more recent model (by 1 year and 2 months) than the E-P3, 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 A99 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A99 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-P3 are 20.2 x 15.1 inch or 51.2 x 38.4 cm for good quality, 16.1 x 12.1 inch or 41 x 30.7 cm for very good quality, and 13.4 x 10.1 inch or 34.1 x 25.6 cm for excellent quality prints.

The Olympus PEN E-P3 has a native sensitivity range from ISO 200 to ISO 12800. The corresponding ISO settings for the Sony Alpha SLT-A99 are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 50-25600.

E-P3 versus A99 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. Of the two cameras under consideration, the A99 offers substantially better image quality than the E-P3 (overall score 38 points higher). The advantage is based on 4.2 bits higher color depth, 3.9 EV in additional dynamic range, and 1.5 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-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-P3 Four Thirds 12.2 4032 30241080/60i20.810.153651Olympus E-P3
 
Sony A99 Full Frame 24.0 6000 40001080/60p25.014.0155589Sony A99
 
Olympus E-P5 Four Thirds 15.9 4608 34561080/30p22.812.489572Olympus E-P5
 
Olympus E-PL5 Four Thirds 15.9 4608 34561080/30p22.812.388972Olympus E-PL5
 
Olympus E-PL2 Four Thirds 12.2 4032 3024720/30p21.410.257355Olympus E-PL2
 
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
 
Olympus E-PL1 Four Thirds 12.2 4032 3024720/30p21.510.148754Olympus E-PL1
 
Olympus E-P1 Four Thirds 12.2 4032 3024720/30p21.410.453655Olympus E-P1
 
Olympus E-P2 Four Thirds 12.2 4032 3024720/30p21.510.450556Olympus E-P2
 
Panasonic GX1 Four Thirds 15.8 4592 34481080/60p20.810.670355Panasonic GX1
 
Panasonic G10 Four Thirds 12.0 4000 3000720/30p21.210.141152Panasonic G10
 
Sony A99 II Full Frame 42.2 7952 53044K/30p25.413.4231792Sony A99 II
 
Sony A7R II Full Frame 42.2 7952 53044K/30p26.013.9343498Sony A7R II
 
Sony A77 APS-C 24.0 6000 40001080/60p24.013.280178Sony A77
 
Sony A850 Full Frame 24.4 6048 4032none23.812.2141579Sony A850
 
Sony A900 Full Frame 24.4 6048 4032none23.712.3143179Sony A900

Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the A99 provides a faster frame rate than the E-P3. It can shoot movie footage at 1080/60p, while the Olympus is limited to 1080/60i.

 

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the A99 has an electronic viewfinder (2359k dots), which can be very helpful when shooting in bright sunlight. In contrast, the E-P3 relies on live view and the rear LCD for framing. That said, the E-P3 can be equipped with an optional viewfinder – the VF-3. The following table reports on some other key feature differences and similarities of the Olympus E-P3, the Sony A99, and comparable cameras.

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-P3optional n 3.0 614 fixed Y 1/4000s 3.0 Y Y Olympus E-P3
 
Sony A992359 Y 3.0 1229 full-flex n 1/8000s 6.0 n Y Sony A99
 
Olympus E-P5optional n 3.0 1037 tilting Y 1/8000s 9.0 Y Y Olympus E-P5
 
Olympus E-PL5optional n 3.0 460 tilting Y 1/4000s 8.0 n Y Olympus E-PL5
 
Olympus E-PL2optional n 3.0 460 fixed n 1/4000s 3.0 Y Y Olympus E-PL2
 
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
 
Olympus E-PL1optional n 2.7 230 fixed n 1/2000s 3.0 Y Y Olympus E-PL1
 
Olympus E-P1none n 3.0 230 fixed n 1/4000s 3.0 n Y Olympus E-P1
 
Olympus E-P2optional n 3.0 230 fixed n 1/4000s 3.0 n Y Olympus E-P2
 
Panasonic GX1optional n 3.0 460 fixed Y 1/4000s 4.2 Y n Panasonic GX1
 
Panasonic G10202 n 3.0 460 fixed n 1/4000s 2.6 Y n Panasonic G10
 
Sony A99 II2400 Y 3.0 1229 full-flex n 1/8000s 12.0 n Y Sony A99 II
 
Sony A7R II2400 n 3.0 1229 tilting n 1/8000s 5.0 n Y Sony A7R II
 
Sony A772359 Y 3.0 921 full-flex n 1/8000s 12.0 Y Y Sony A77
 
Sony A850optical Y 3.0 922 fixed n 1/8000s 3.0 n Y Sony A850
 
Sony A900optical Y 3.0 922 fixed n 1/8000s 5.0 n Y Sony A900

One difference between the cameras concerns the presence of an on-board flash. The E-P3 has one, while the A99 does not. While the built-in flash of the E-P3 is not very powerful, it can at times be useful as a fill-in light.

The A99 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-P3 does not have a selfie-screen.

The E-P3 writes its imaging data to SDXC cards, while the A99 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-P3 and Sony Alpha SLT-A99 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-P3Ystereonone--mini2.0---Olympus E-P3
 
Sony A99YstereomonoYYmini2.0---Sony A99
 
Olympus E-P5Ystereomono--micro2.0Y--Olympus E-P5
 
Olympus E-PL5Ystereomono--mini2.0---Olympus E-PL5
 
Olympus E-PL2Ystereonone--mini2.0---Olympus E-PL2
 
Olympus E-PL3Ystereonone--mini2.0---Olympus E-PL3
 
Olympus E-PM1Ystereomono--mini2.0---Olympus E-PM1
 
Olympus E-PL1Ystereonone--mini2.0---Olympus E-PL1
 
Olympus E-P1Ystereonone--mini2.0---Olympus E-P1
 
Olympus E-P2Ystereonone--mini2.0---Olympus E-P2
 
Panasonic GX1Ystereomono--mini2.0---Panasonic GX1
 
Panasonic G10Ymononone--mini2.0---Panasonic G10
 
Sony A99 IIYstereomonoYYmicro2.0YYYSony A99 II
 
Sony A7R IIYstereomonoYYmicro2.0YY-Sony A7R II
 
Sony A77YstereomonoY-mini2.0---Sony A77
 
Sony A850Ynonenone--mini2.0---Sony A850
 
Sony A900Ynonenone--mini2.0---Sony A900

It is notable that the A99 has a headphone jack, which makes it possible to attach external headphones and monitor the quality of sound during the recording process. The E-P3 lacks such a headphone port.

Studio photographers will appreciate that the Sony A99 (unlike the E-P3) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Travel and landscape photographers will find it useful that the A99 has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.

Both the E-P3 and the A99 have been discontinued, but can regularly be found used on eBay. The E-P3 was replaced by the Olympus E-P5, while the A99 was followed by the Sony A99 II. 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 how do things add up? Is the Olympus E-P3 better than the Sony A99 or vice versa? Below is a summary of the relative strengths of each of the two contestants.

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Arguments in favor of the Olympus PEN E-P3:

  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • More compact: Is smaller (122x69mm vs 147x111mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 443g or 55 percent) and hence easier to carry around.
  • More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • More affordable: Was introduced into a lower priced category (71 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in June 2011).

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Reasons to prefer the Sony Alpha SLT-A99:

  • More detail: Has more megapixels (24 vs 12.2MP), which boosts linear resolution by 43%.
  • Better image quality: Scores substantially higher (38 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (4.2 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (3.9 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (1.5 stops ISO advantage).
  • Better video: Provides higher movie framerates (1080/60p versus 1080/60i).
  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Better sound control: Has a headphone port that enables audio monitoring while 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 614k 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 (6 vs 3 flaps/sec) to capture the decisive moment.
  • Longer lasting: Gets more shots (500 versus 330) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Easier geotagging: Features an internal GPS sensor to log localization data.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • More modern: Was introduced somewhat (1 year and 2 months) more recently.

If the number of relative strengths (bullet points above) is taken as a guide, the A99 is the clear winner of the contest (20 : 7 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision 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-P3 07:20 A99

How about other alternatives? Do the specifications of the Olympus E-P3 and the Sony A99 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 comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it says little about, for example, the shooting experience and imaging performance of the E-P3 and the A99 in practical situations. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable.

Expert reviews

This is why hands-on reviews by experts are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear 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-P383/10074/1004.5/54.5/54.5/5 Jun 2011 799iOlympus E-P3
 
Sony A99..84/1004.5/5o4.5/5 Sep 2012 2,799iSony A99
 
Olympus E-P5+ +78/1004.5/54.5/55/5 May 2013 999iOlympus E-P5
 
Olympus E-PL5+ +..4.5/54.5/54.5/5 Sep 2012 599iOlympus E-PL5
 
Olympus E-PL283/10071/1004.5/54.5/54.5/5 Jan 2011 599iOlympus E-PL2
 
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
 
Olympus E-PL186/10069/1004/54.5/54.5/5 Feb 2010 599iOlympus E-PL1
 
Olympus E-P1+66/1004/54/54.5/5 Jun 2009 799iOlympus E-P1
 
Olympus E-P2+69/1004/54.5/54.5/5 Nov 2009 799iOlympus E-P2
 
Panasonic GX1+77/1004.5/54.5/54.5/5 Nov 2011 699iPanasonic GX1
 
Panasonic G10..70/1004/5..4/5 Mar 2010 499iPanasonic G10
 
Sony A99 II..85/1004.5/54.5/54.5/5 Sep 2016 3,199 iSony A99 II
 
Sony A7R II+ +90/1005/54.5/55/5 Jun 2015 3,199iSony A7R II
 
Sony A7791/10081/100..4.5/55/5 Aug 2011 1,399iSony A77
 
Sony A850..75/100..4/54.5/5 Aug 2009 1,999iSony A850
 
Sony A900+ ++ +4.5/54/55/5 Sep 2008 2,999iSony A900
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted with care, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Olympus E-P3:
Check Ebay offers
Sony A99:
Check Ebay offers

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-P3 vs Sony A99

    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-P3 Sony A99
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Micro Four Thirds lenses Sony A mount lenses
    Launch Date June 2011 September 2012
    Launch Price USD 799 USD 2799
    Sensor Specs Olympus E-P3 Sony A99
    Sensor Technology CMOS CMOS
    Sensor Format Four Thirds Sensor Full Frame Sensor
    Sensor Size 17.3 x 13.0 mm 35.8 x 23.8 mm
    Sensor Area 224.9 mm2 852.04 mm2
    Sensor Diagonal 21.6 mm 43 mm
    Crop Factor 2.0x 1.0x
    Sensor Resolution 12.2 Megapixels 24 Megapixels
    Image Resolution 4032 x 3024 pixels 6000 x 4000 pixels
    Pixel Pitch 4.29 μm 5.96 μm
    Pixel Density 5.42 MP/cm2 2.82 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability 1080/60i Video 1080/60p Video
    ISO Setting 200-12800 ISO 100-25600 ISO
    ISO Boost no Enhancement 50-25600 ISO
    Image Processor TruePic VI BIONZ X
    DXO Sensor Quality (score) 51 89
    DXO Color Depth (bits) 20.8 25.0
    DXO Dynamic Range (EV) 10.1 14.0
    DXO Low Light (ISO) 536 1555
    Screen Specs Olympus E-P3 Sony A99
    Viewfinder Type Viewfinder optional Electronic viewfinder
    Viewfinder Field of View 100%
    Viewfinder Magnification 0.71x
    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 614k dots 1229k dots
    LCD Attachment Fixed screen Fully flexible screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Olympus E-P3 Sony A99
    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 3 shutter flaps/s 6 shutter flaps/s
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash Build-in Flash no On-Board 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-P3 Sony A99
    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
    Headphone Socket no Headphone port Headphone port
    Wifi Support no Wifi no Wifi
    Geotagging no internal GPS GPS built-in
    Body Specs Olympus E-P3 Sony A99
    Environmental SealingNot weather sealedWeathersealed body
    Battery Type BLS-5 NP-FM500H
    Battery Life (CIPA)330 shots per charge500 shots per charge
    Body Dimensions 122 x 69 x 34 mm
    (4.8 x 2.7 x 1.3 in)
    147 x 111 x 78 mm
    (5.8 x 4.4 x 3.1 in)
    Camera Weight 369 g (13.0 oz) 812 g (28.6 oz)

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