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Olympus E-M10 IV vs Sony A99

The Olympus OM-D E-M10 Mark IV and the Sony Alpha SLT-A99 are two digital cameras that were announced, respectively, in August 2020 and September 2012. The E-M10 IV is a mirrorless interchangeable lens camera, while the A99 is a DSLR. The cameras are based on a Four Thirds (E-M10 IV) and a full frame (A99) sensor. The Olympus has a resolution of 20.2 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-M10 IV
versus
Sony A99
Olympus E-M10 IV Sony A99
Mirrorless system camera Digital single lens reflex
Micro Four Thirds lenses Sony A mount lenses
20.2 MP, Four Thirds Sensor 24 MP, Full Frame Sensor
4K/30p Video 1080/60p Video
ISO 200-25,600 ISO 100-25,600
Electronic viewfinder (2360k dots) Electronic viewfinder (2359k dots)
3.0 LCD, 1040k dots 3.0 LCD, 1229k dots
Tilting touchscreen Fully flexible screen (no touchscreen)
15 shutter flaps per second 6 shutter flaps per second
In-body stabilizationIn-body stabilization
not weather sealedWeathersealed body
360 shots per battery charge500 shots per battery charge
122 x 84 x 49 mm, 383 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 OM-D E-M10 Mark IV 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

The physical size and weight of the Olympus E-M10 IV and the Sony A99 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 size dimensions are rounded to the nearest millimeter.

The E-M10 IV can be obtained in two different colors (black, silver), while the A99 is only available in black.

Size Olympus E-M10 IV vs Sony A99
Compare E-M10 IV versus A99 top
Comparison E-M10 IV 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 (59 percent) than the Olympus E-M10 IV. Moreover, the A99 is substantially heavier (112 percent) than the E-M10 IV. It is noteworthy in this context that the A99 is splash and dust-proof, while the E-M10 IV 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-M10 IV gets 360 shots out of its BLS-50 battery, while the A99 can take 500 images on a single charge of its NP-FM500H power pack. The power pack in the E-M10 IV can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

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Body Specifications
    Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Olympus E-M10 IV 122 mm 84 mm 49 mm 383 g 360 n Aug 2020 699 i
2.
 
Sony A99 147 mm 111 mm 78 mm 812 g 500 Y Sep 2012 2,799 i
3.
 
Olympus E-M5 III 125 mm 85 mm 50 mm 414 g 310 Y Oct 2019 1,199 i
4.
 
Olympus E-PL10 117 mm 68 mm 39 mm 380 g 350 n Oct 2019 599 i
5.
 
Olympus E-PL9 117 mm 68 mm 39 mm 380 g 350 n Feb 2018 599 i
6.
 
Olympus E-M10 III 122 mm 84 mm 50 mm 410 g 330 n Aug 2017 649 i
7.
 
Olympus E-PL8 115 mm 67 mm 38 mm 357 g 350 n Sep 2016 549 i
8.
 
Olympus PEN-F 125 mm 72 mm 37 mm 427 g 330 n Jan 2016 1,199 i
9.
 
Olympus E-M10 II 120 mm 83 mm 47 mm 390 g 320 n Aug 2015 649 i
10.
 
Olympus E-M10 119 mm 82 mm 46 mm 396 g 320 n Jan 2014 699 i
11.
 
Olympus E-PL7 115 mm 67 mm 38 mm 357 g 350 n Aug 2014 599 i
12.
 
Panasonic G100 116 mm 83 mm 54 mm 352 g 270 n Jun 2020 649 i
13.
 
Sony A9 II 129 mm 96 mm 76 mm 678 g 690 Y Oct 2019 4,499 i
14.
 
Sony A99 II 143 mm 104 mm 76 mm 849 g 490 Y Sep 2016 3,199 i
15.
 
Sony A77 143 mm 104 mm 81 mm 732 g 470 Y Aug 2011 1,399 i
16.
 
Sony A850 156 mm 117 mm 82 mm 895 g 880 Y Aug 2009 1,999 i
17.
 
Sony A900 156 mm 117 mm 82 mm 895 g 880 Y Sep 2008 2,999 i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

Any camera decision will naturally be influenced heavily by the price. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The E-M10 IV was launched at a markedly lower price (by 75 percent) than the A99, which puts it into a different market segment. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. 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.

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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. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixels in a sensor of the same technological generation. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better 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-M10 IV 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-M10 IV has a native 4:3 aspect ratio, while the one in the A99 offers a 3:2 aspect.

Olympus E-M10 IV and Sony A99 sensor measures

With 24MP, the A99 offers a higher resolution than the E-M10 IV (20.2MP), but the A99 nevertheless has larger individual pixels (pixel pitch of 5.96μm versus 3.34μm for the E-M10 IV) due to its larger sensor. However, the E-M10 IV is a much more recent model (by 7 years and 10 months) than the A99, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units. Coming back to sensor resolution, it should be mentioned that the E-M10 IV has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

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 inches or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inches or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inches or 50.8 x 33.9 cm. The corresponding values for the Olympus E-M10 IV are 25.9 x 19.4 inches or 65.8 x 49.4 cm for good quality, 20.7 x 15.6 inches or 52.7 x 39.5 cm for very good quality, and 17.3 x 13 inches or 43.9 x 32.9 cm for excellent quality prints.

The Olympus OM-D E-M10 Mark IV has a native sensitivity range from ISO 200 to ISO 25600, which can be extended to ISO 100-25600. 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-M10 IV versus A99 MP

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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. The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

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Sensor Characteristics
    Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Olympus E-M10 IV Four Thirds 20.2 5184 38884K/30p...... ..
2.
 
Sony A99 Full Frame 24.0 6000 40001080/60p25.014.01555 89
3.
 
Olympus E-M5 III Four Thirds 20.2 5184 38884K/30p...... ..
4.
 
Olympus E-PL10 Four Thirds 15.9 4608 34564K/30p...... ..
5.
 
Olympus E-PL9 Four Thirds 15.9 4608 34564K/30p...... ..
6.
 
Olympus E-M10 III Four Thirds 15.9 4608 34564K/30p...... ..
7.
 
Olympus E-PL8 Four Thirds 15.9 4608 34561080/30p...... ..
8.
 
Olympus PEN-F Four Thirds 20.2 5184 38881080/60p23.112.4894 74
9.
 
Olympus E-M10 II Four Thirds 15.9 4608 34561080/60p23.112.5842 73
10.
 
Olympus E-M10 Four Thirds 15.9 4608 34561080/30p22.812.3884 72
11.
 
Olympus E-PL7 Four Thirds 15.9 4608 34561080/30p22.712.4873 72
12.
 
Panasonic G100 Four Thirds 20.2 5184 38884K/30p...... ..
13.
 
Sony A9 II Full Frame 24.0 6000 40004K/30p25.014.03434 93
14.
 
Sony A99 II Full Frame 42.2 7952 53044K/30p25.413.42317 92
15.
 
Sony A77 APS-C 24.0 6000 40001080/60p24.013.2801 78
16.
 
Sony A850 Full Frame 24.4 6048 4032none23.812.21415 79
17.
 
Sony A900 Full Frame 24.4 6048 4032none23.712.31431 79

Many modern cameras are not only capable of taking still images, but can also record movies. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the E-M10 IV provides a higher video resolution than the A99. It can shoot video footage at 4K/30p, while the Sony is limited to 1080/60p.

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Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. The two cameras under consideration are similar with respect to both having an electronic viewfinder. However, the one in the E-M10 IV offers a slightly higher resolution than the one in the A99 (2360k vs 2359k dots). The adjacent table lists some of the other core features of the Olympus E-M10 IV and Sony A99 along with similar information for a selection of comparators.

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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
1.
 
Olympus E-M10 IV2360 n 3.0 1040 tilting Y 1/4000s 15.0 Y Y
2.
 
Sony A992359 Y 3.0 1229 full-flex n 1/8000s 6.0 n Y
3.
 
Olympus E-M5 III2360 n 3.0 1040 swivel Y 1/8000s 10.0 n Y
4.
 
Olympus E-PL10none n 3.0 1040 tilting Y 1/4000s 8.6 Y Y
5.
 
Olympus E-PL9none n 3.0 1040 tilting Y 1/4000s 8.6 Y Y
6.
 
Olympus E-M10 III2360 n 3.0 1040 tilting Y 1/4000s 8.6 Y Y
7.
 
Olympus E-PL8optional n 3.0 1037 tilting Y 1/4000s 8.0 n Y
8.
 
Olympus PEN-F2360 n 3.0 1037 swivel Y 1/8000s 10.0 n Y
9.
 
Olympus E-M10 II2360 n 3.0 1040 tilting Y 1/4000s 8.0 Y Y
10.
 
Olympus E-M101440 n 3.0 1037 tilting Y 1/4000s 8.0 Y Y
11.
 
Olympus E-PL7optional n 3.0 1037 tilting Y 1/4000s 8.0 n Y
12.
 
Panasonic G1003680 n 3.0 1840 swivel Y 1/500s 10.0 Y n
13.
 
Sony A9 II3686 n 3.0 1440 tilting Y 1/8000s 10.0 n Y
14.
 
Sony A99 II2400 Y 3.0 1229 full-flex n 1/8000s 12.0 n Y
15.
 
Sony A772359 Y 3.0 921 full-flex n 1/8000s 12.0 Y Y
16.
 
Sony A850optical Y 3.0 922 fixed n 1/8000s 3.0 n Y
17.
 
Sony A900optical Y 3.0 922 fixed n 1/8000s 5.0 n Y

One difference between the cameras concerns the presence of an on-board flash. The E-M10 IV has one, while the A99 does not. While the built-in flash of the E-M10 IV is not very powerful, it can at times be useful as a fill-in light.

Both cameras have an articulated rear screen that can be turned to be front-facing. This feature will be particularly appreciated by vloggers and photographers who are interested in taking selfies.

The reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the E-M10 IV is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).

The Olympus E-M10 IV has an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

The E-M10 IV writes its imaging data to SDXC cards, while the A99 uses SDXC or Memory Stick PRO Duo cards. The A99 features dual card slots, which can be very useful in case a memory card fails. In contrast, the E-M10 IV only has one slot. The E-M10 IV supports UHS-II cards (Ultra High Speed data transfer of up to 312 MB/s), while the A99 can use UHS-I cards (up to 104 MB/s).

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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 OM-D E-M10 Mark IV and Sony Alpha SLT-A99 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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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
1.
 
Olympus E-M10 IVYstereomono--micro2.0Y-Y
2.
 
Sony A99YstereomonoYYmini2.0---
3.
 
Olympus E-M5 IIIYstereomonoY-micro2.0Y-Y
4.
 
Olympus E-PL10Ystereomono--micro2.0Y-Y
5.
 
Olympus E-PL9Ystereomono--micro2.0Y-Y
6.
 
Olympus E-M10 IIIYstereomono--micro2.0Y--
7.
 
Olympus E-PL8Ystereomono--micro2.0Y--
8.
 
Olympus PEN-FYstereomono--micro2.0Y--
9.
 
Olympus E-M10 IIYstereomono--micro2.0Y--
10.
 
Olympus E-M10Ystereomono--micro2.0Y--
11.
 
Olympus E-PL7Ystereomono--micro2.0Y--
12.
 
Panasonic G100YstereomonoYYmicro2.0Y-Y
13.
 
Sony A9 IIYstereomonoYYmicro3.1YYY
14.
 
Sony A99 IIYstereomonoYYmicro2.0YYY
15.
 
Sony A77YstereomonoY-mini2.0---
16.
 
Sony A850Y----mini2.0---
17.
 
Sony A900Y----mini2.0---

It is notable that the E-M10 IV offers wifi support, while the A99 does not. Wifi can be a very convenient means to transfer image data to an off-camera location.

Studio photographers will appreciate that the Sony A99 (unlike the E-M10 IV) 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.

The E-M10 IV is a recent model that features in the current product line-up of Olympus. In contrast, the A99 has been discontinued (but can be found pre-owned on eBay). As a replacement in the same line of cameras, the A99 was succeeded 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.

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Review summary

So what is the bottom line? Is the Olympus E-M10 IV better than the Sony A99 or vice versa? The listing below highlights the relative strengths of the two models.

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Advantages of the Olympus OM-D E-M10 Mark IV:

  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Better video: Provides higher definition movie capture (4K/30p vs 1080/60p).
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • Faster burst: Shoots at higher frequency (15 vs 6 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • More compact: Is smaller (122x84mm vs 147x111mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 429g or 53 percent) and hence easier to carry around.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • 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.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier wireless transfer: Supports Bluetooth for image sharing without cables.
  • Faster buffer clearing: Supports a more advanced SD data transfer standard (UHS-II vs UHS-I).
  • More affordable: Was introduced into a lower priced category (75 percent cheaper at launch).
  • More modern: Reflects 7 years and 10 months of technical progress since the A99 launch.

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Arguments in favor of the Sony Alpha SLT-A99:

  • More detail: Has more megapixels (24 vs 20.2MP), which boosts linear resolution by 11%.
  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • 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.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.71x vs 0.62x).
  • Easier setting verification: Features a control panel on top to check shooting parameters.
  • More detailed LCD: Has a higher resolution rear screen (1229k vs 1040k dots).
  • More flexible LCD: Has a full-flex screen for odd-angle shots in portrait or landscape orientation.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Longer lasting: Gets more shots (500 versus 360) 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.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More heavily discounted: Has been around for much longer (launched in September 2012).

If the count of relative strengths (bullet points above) is taken as a measure, the E-M10 IV comes out slightly ahead of the A99 (16 : 15 points). However, the pertinence of the various camera strengths will differ across photographers, so that you might want to weigh individual camera traits according to their importance for your own imaging needs before making a camera decision. A professional wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

E-M10 IV 16:15 A99

How about other alternatives? Do the specifications of the Olympus E-M10 IV 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 specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the E-M10 IV or the A99. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.

Expert reviews

This is why hands-on reviews by experts are important. The following table reports the overall ratings of the cameras as published by some of the major camera review sites (amateurphotographer [AP], cameralabs [CL], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). 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.

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Expert Camera Reviews
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Olympus E-M10 IV4.5/5..81/1004.5/54.5/5 Aug 2020 699 i
2.
 
Sony A995/5..84/1004.5/54.5/5 Sep 2012 2,799 i
3.
 
Olympus E-M5 III5/5+82/1004.5/54.5/5 Oct 2019 1,199 i
4.
 
Olympus E-PL10....77/100..4/5 Oct 2019 599 i
5.
 
Olympus E-PL9..+..4.5/54/5 Feb 2018 599 i
6.
 
Olympus E-M10 III..+80/1004.5/54.5/5 Aug 2017 649 i
7.
 
Olympus E-PL8......4.5/54/5 Sep 2016 549 i
8.
 
Olympus PEN-F....82/1004.5/55/5 Jan 2016 1,199 i
9.
 
Olympus E-M10 II4.5/5+ +80/1005/55/5 Aug 2015 649 i
10.
 
Olympus E-M104/5..80/1005/55/5 Jan 2014 699 i
11.
 
Olympus E-PL74/5+..5/54/5 Aug 2014 599 i
12.
 
Panasonic G100....78/1004/54/5 Jun 2020 649 i
13.
 
Sony A9 II....90/1005/55/5 Oct 2019 4,499 i
14.
 
Sony A99 II....85/1004.5/54.5/5 Sep 2016 3,199 i
15.
 
Sony A775/591/10081/100..5/5 Aug 2011 1,399 i
16.
 
Sony A8503/5..75/100..4.5/5 Aug 2009 1,999 i
17.
 
Sony A900..+ ++ +4.5/55/5 Sep 2008 2,999 i
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The review scores listed above should be treated with care, though. The assessments were made in relation to similar cameras of the same technological generation. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Olympus E-M10 IV:
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Sony A99:
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Other camera comparisons

Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Olympus E-M10 IV 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-M10 IV Sony A99
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Micro Four Thirds lenses Sony A mount lenses
    Launch Date August 2020 September 2012
    Launch Price USD 699 USD 2,799
    Sensor Specs Olympus E-M10 IV 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 20.2 Megapixels 24 Megapixels
    Image Resolution 5184 x 3888 pixels 6000 x 4000 pixels
    Pixel Pitch 3.34 μm 5.96 μm
    Pixel Density 8.96 MP/cm2 2.82 MP/cm2
    Moiré control no AA filter Anti-Alias filter
    Movie Capability 4K/30p Video 1080/60p Video
    ISO Setting 200 - 25,600 ISO 100 - 25,600 ISO
    ISO Boost 100 - 25,600 ISO 50 - 25,600 ISO
    Image Processor TruePic VIII BIONZ X
    DXO Sensor Quality (score) .. 89
    DXO Color Depth (bits) .. 25.0
    DXO Dynamic Range (EV) .. 14.0
    DXO Low Light (ISO) .. 1555
    Screen Specs Olympus E-M10 IV Sony A99
    Viewfinder Type Electronic viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.62x 0.71x
    Viewfinder Resolution 2360k dots 2359k dots
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 1040k dots 1229k dots
    LCD Attachment Tilting screen Fully flexible screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Olympus E-M10 IV Sony A99
    Focus System Contrast-detect AF Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/8000s
    Continuous Shooting 15 shutter flaps/s 6 shutter flaps/s
    Electronic Shutterup to 1/16000sno E-Shutter
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    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 Dual card slots
    UHS card support UHS-II UHS-I
    Connectivity Specs Olympus E-M10 IV Sony A99
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 2.0
    HDMI Port micro HDMI mini HDMI
    Microphone Port no MIC socket External MIC port
    Headphone Socket no Headphone port Headphone port
    Wifi Support Wifi built-in no Wifi
    Bluetooth Support Bluetooth built-in no Bluetooth
    Geotagging no internal GPS GPS built-in
    Body Specs Olympus E-M10 IV Sony A99
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type BLS-50 NP-FM500H
    Battery Life (CIPA)360 shots per charge500 shots per charge
    In-Camera Charging USB charging no USB charging
    Body Dimensions 122 x 84 x 49 mm
    (4.8 x 3.3 x 1.9 in)
    147 x 111 x 78 mm
    (5.8 x 4.4 x 3.1 in)
    Camera Weight 383 g (13.5 oz) 812 g (28.6 oz)

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