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Olympus E-M10 IV vs Sony A77 II

The Olympus OM-D E-M10 Mark IV and the Sony Alpha SLT-A77 II are two digital cameras that were announced, respectively, in August 2020 and May 2014. The E-M10 IV is a mirrorless interchangeable lens camera, while the A77 II is a DSLR. The cameras are based on a Four Thirds (E-M10 IV) and an APS-C (A77 II) 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 A77 II
Olympus E-M10 IV   Sony A77 II
Mirrorless system camera Digital single lens reflex
Micro Four Thirds lenses Sony A mount lenses
20.2 MP – Four Thirds sensor 24 MP – APS-C sensor
4K/30p Video 1080/60p Video
ISO 200-25,600 ISO 100-25,600 (50 - 51,200)
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 12 shutter flaps per second
In-body stabilizationIn-body stabilization
not weather sealedWeathersealed body
360 shots per battery charge480 shots per battery charge
122 x 84 x 49 mm, 383 g 143 x 104 x 81 mm, 647 g
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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-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.

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Body comparison

An illustration of the physical size and weight of the Olympus E-M10 IV and the Sony A77 II is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth dimensions are rounded to the nearest millimeter.

The E-M10 IV can be obtained in two different colors (black, silver), while the A77 II is only available in black.

Size Olympus E-M10 IV vs Sony A77 II
Compare E-M10 IV versus A77 II top
Comparison E-M10 IV 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 (45 percent) than the Olympus E-M10 IV. Moreover, the A77 II is substantially heavier (69 percent) than the E-M10 IV. It is noteworthy in this context that the A77 II 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 Olympus BLS-50 battery, while the A77 II can take 480 images on a single charge of its Sony 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 following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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Body Specifications
  empty Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price
Street
Price
1.
 
Olympus E-M10 IV 122 mm 84 mm 49 mm 383 g 360 n Aug 2020 US$ 699 amazon.com
2.
 
Sony A77 II 143 mm 104 mm 81 mm 647 g 480 Y May 2014 US$ 1 199ebay.com
3.
 
Nikon D7100 136 mm 107 mm 76 mm 765 g 950 Y Feb 2013 US$ 1 199ebay.com
4.
 
Olympus E-M5 III 125 mm 85 mm 50 mm 414 g 310 Y Oct 2019 US$ 1 199ebay.com
5.
 
Olympus E-M10 119 mm 82 mm 46 mm 396 g 320 n Jan 2014 US$ 699ebay.com
6.
 
Olympus E-M10 II 120 mm 83 mm 47 mm 390 g 320 n Aug 2015 US$ 649ebay.com
7.
 
Olympus E-M10 III 122 mm 84 mm 50 mm 410 g 330 n Aug 2017 US$ 649ebay.com
8.
 
Olympus E-P7 118 mm 69 mm 38 mm 337 g 360 n Jun 2021 US$ 799 amazon.com
9.
 
Olympus E-PL7 115 mm 67 mm 38 mm 357 g 350 n Aug 2014 US$ 599ebay.com
10.
 
Olympus E-PL8 115 mm 67 mm 38 mm 357 g 350 n Sep 2016 US$ 549ebay.com
11.
 
Olympus E-PL9 117 mm 68 mm 39 mm 380 g 350 n Feb 2018 US$ 599ebay.com
12.
 
Olympus E-PL10 117 mm 68 mm 39 mm 380 g 350 n Oct 2019 US$ 599ebay.com
13.
 
Olympus PEN-F 125 mm 72 mm 37 mm 427 g 330 n Jan 2016 US$ 1 199ebay.com
14.
 
Sony A58 129 mm 95 mm 78 mm 492 g 690 n Feb 2013 US$ 599ebay.com
15.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 US$ 699ebay.com
16.
 
Sony A77 143 mm 104 mm 81 mm 732 g 470 Y Aug 2011 US$ 1 399ebay.com
17.
 
Sony A6600 120 mm 67 mm 69 mm 503 g 810 Y Aug 2019 US$ 1 399 amazon.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

The price is, of course, an important factor in any camera decision. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The E-M10 IV was launched at a markedly lower price (by 42 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. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

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. 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 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-M10 IV has a native 4:3 aspect ratio, while the one in the A77 II offers a 3:2 aspect.

Olympus E-M10 IV and Sony A77 II sensor measures

With 24MP, the A77 II offers a higher resolution than the E-M10 IV (20.2MP), but the A77 II nevertheless has larger individual pixels (pixel pitch of 3.91μm 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 6 years and 3 months) than the A77 II, 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 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 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-A77 II are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 50-51200.

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

E-M10 IV versus A77 II MP

For many cameras, data on sensor performance has been reported by DXO Mark. 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
  empty 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/30p23.313.2140276
2.
 
Sony A77 II APS-C 24.0 6000 40001080/60p24.413.4101382
3.
 
Nikon D7100 APS-C 24.0 6000 40001080/60p24.213.7125683
4.
 
Olympus E-M5 III Four Thirds 20.2 5184 38884K/30p23.313.1132476
5.
 
Olympus E-M10 Four Thirds 15.9 4608 34561080/30p22.812.388472
6.
 
Olympus E-M10 II Four Thirds 15.9 4608 34561080/60p23.112.584273
7.
 
Olympus E-M10 III Four Thirds 15.9 4608 34564K/30p23.112.8112074
8.
 
Olympus E-P7 Four Thirds 20.2 5184 38884K/30p23.413.3149477
9.
 
Olympus E-PL7 Four Thirds 15.9 4608 34561080/30p22.712.487372
10.
 
Olympus E-PL8 Four Thirds 15.9 4608 34561080/30p23.012.6103073
11.
 
Olympus E-PL9 Four Thirds 15.9 4608 34564K/30p23.112.8116274
12.
 
Olympus E-PL10 Four Thirds 15.9 4608 34564K/30p23.313.1132476
13.
 
Olympus PEN-F Four Thirds 20.2 5184 38881080/60p23.112.489474
14.
 
Sony A58 APS-C 19.8 5456 36321080/60i23.312.575374
15.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.570179
16.
 
Sony A77 APS-C 24.0 6000 40001080/60p24.013.280178
17.
 
Sony A6600 APS-C 24.0 6000 40004K/30p23.813.4149782
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras cannot only take still pictures, but also record videos. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the E-M10 IV provides a higher video resolution than the A77 II. It can shoot video footage at 4K/30p, while the Sony is limited to 1080/60p.

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Feature comparison

Beyond body and sensor, cameras can and do differ across a range 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 A77 II (2360k vs 2359k dots). The following table reports on some other key feature differences and similarities of the Olympus E-M10 IV, the Sony A77 II, and comparable cameras.

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Core Features
  empty Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Olympus E-M10 IV2360 n3.0 / 1040 tilting Y 1/4000s 15.0/s Y Y
2.
 
Sony A77 II2359 Y3.0 / 1229 full-flex n 1/8000s 12.0/s Y Y
3.
 
Nikon D7100optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
4.
 
Olympus E-M5 III2360 n3.0 / 1040 swivel Y 1/8000s 10.0/s n Y
5.
 
Olympus E-M101440 n3.0 / 1037 tilting Y 1/4000s 8.0/s Y Y
6.
 
Olympus E-M10 II2360 n3.0 / 1040 tilting Y 1/4000s 8.0/s Y Y
7.
 
Olympus E-M10 III2360 n3.0 / 1040 tilting Y 1/4000s 8.6/s Y Y
8.
 
Olympus E-P7none n3.0 / 1040 tilting Y 1/4000s 8.7/s Y Y
9.
 
Olympus E-PL7optional n3.0 / 1037 tilting Y 1/4000s 8.0/s n Y
10.
 
Olympus E-PL8optional n3.0 / 1037 tilting Y 1/4000s 8.0/s n Y
11.
 
Olympus E-PL9none n3.0 / 1040 tilting Y 1/4000s 8.6/s Y Y
12.
 
Olympus E-PL10none n3.0 / 1040 tilting Y 1/4000s 8.6/s Y Y
13.
 
Olympus PEN-F2360 n3.0 / 1037 swivel Y 1/8000s 10.0/s n Y
14.
 
Sony A581440 n2.7 / 460 tilting n 1/4000s 5.0/s Y Y
15.
 
Sony A681440 Y2.7 / 460 tilting n 1/4000s 8.0/s Y Y
16.
 
Sony A772359 Y3.0 / 921 full-flex n 1/8000s 12.0/s Y Y
17.
 
Sony A66002359 n3.0 / 922 tilting Y 1/4000s 11.0/s n Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The E-M10 IV has a touchscreen, while the A77 II has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.

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 A77 II uses SDXC or Memory Stick PRO Duo cards. The E-M10 IV supports UHS-II cards (Ultra High Speed data transfer of up to 312 MB/s), while the A77 II 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-A77 II and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
  empty Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Olympus E-M10 IVYstereo / mono--micro2.0Y-Y
2.
 
Sony A77 IIYstereo / monoY-mini2.0YY-
3.
 
Nikon D7100Ystereo / monoYYmini2.0---
4.
 
Olympus E-M5 IIIYstereo / monoY-micro2.0Y-Y
5.
 
Olympus E-M10Ystereo / mono--micro2.0Y--
6.
 
Olympus E-M10 IIYstereo / mono--micro2.0Y--
7.
 
Olympus E-M10 IIIYstereo / mono--micro2.0Y--
8.
 
Olympus E-P7Ystereo / mono--micro2.0Y-Y
9.
 
Olympus E-PL7Ystereo / mono--micro2.0Y--
10.
 
Olympus E-PL8Ystereo / mono--micro2.0Y--
11.
 
Olympus E-PL9Ystereo / mono--micro2.0Y-Y
12.
 
Olympus E-PL10Ystereo / mono--micro2.0Y-Y
13.
 
Olympus PEN-FYstereo / mono--micro2.0Y--
14.
 
Sony A58Ystereo / monoY-mini2.0---
15.
 
Sony A68Ystereo / monoY-micro2.0---
16.
 
Sony A77Ystereo / monoY-mini2.0---
17.
 
Sony A6600Ystereo / monoYYYES2.0YYY

It is notable that the A77 II has a microphone port, which can help to improve the quality of audio recordings by attaching an external microphone. The E-M10 IV does not feature such a mic input.

Studio photographers will appreciate that the Sony A77 II (unlike the E-M10 IV) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

The E-M10 IV is a recent model that features in the current product line-up of Olympus. In contrast, the A77 II has been discontinued (but can be found pre-owned on ebay). There has not been a direct replacement model for the A77 II from Sony. Further information on the features and operation of the E-M10 IV and A77 II can be found, respectively, in the Olympus E-M10 IV Manual (free pdf) or the online Sony A77 II Manual.

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Review summary

So what conclusions can be drawn? Which of the two cameras – the Olympus E-M10 IV or the Sony A77 II – has the upper hand? Is one clearly better than the other? A synthesis of the relative strong points of each of the models is listed below.

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Arguments in favor 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 12 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 143x104mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 264g or 41 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 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 (42 percent cheaper at launch).
  • More modern: Reflects 6 years and 3 months of technical progress since the A77 II launch.

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Reasons to prefer the Sony Alpha SLT-A77 II:

  • 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.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.73x 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 (480 versus 360) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • 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 heavily discounted: Has been around for much longer (launched in May 2014).

If the number of relative strengths (bullet points above) is taken as a guide, the E-M10 IV comes out slightly ahead of the A77 II (14 : 13 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 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 14:13 A77 II

How about other alternatives? Do the specifications of the Olympus E-M10 IV 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 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-M10 IV and the A77 II in practical situations. 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 why expert reviews are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], 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
  empty  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price
Street
Price
1.
 
Olympus E-M10 IV4.5/5..5/581/1004.5/54.5/5 Aug 2020 US$ 699 amazon.com
2.
 
Sony A77 II4/5....80/1004.5/55/5 May 2014 US$ 1 199ebay.com
3.
 
Nikon D71005/5+ +..85/1004.5/54.5/5 Feb 2013 US$ 1 199ebay.com
4.
 
Olympus E-M5 III5/5+5/582/1004.5/54.5/5 Oct 2019 US$ 1 199ebay.com
5.
 
Olympus E-M104/5....80/1005/55/5 Jan 2014 US$ 699ebay.com
6.
 
Olympus E-M10 II4.5/5+ +..80/1005/55/5 Aug 2015 US$ 649ebay.com
7.
 
Olympus E-M10 III..+5/580/1004.5/54.5/5 Aug 2017 US$ 649ebay.com
8.
 
Olympus E-P74/5..4.5/5....4.5/5 Jun 2021 US$ 799 amazon.com
9.
 
Olympus E-PL74/5+....5/54/5 Aug 2014 US$ 599ebay.com
10.
 
Olympus E-PL8........4.5/54/5 Sep 2016 US$ 549ebay.com
11.
 
Olympus E-PL9..+....4.5/54/5 Feb 2018 US$ 599ebay.com
12.
 
Olympus E-PL10....4/577/100..4/5 Oct 2019 US$ 599ebay.com
13.
 
Olympus PEN-F....4/582/1004.5/55/5 Jan 2016 US$ 1 199ebay.com
14.
 
Sony A583/5......4.5/54.5/5 Feb 2013 US$ 599ebay.com
15.
 
Sony A683/5......4/54/5 Nov 2015 US$ 699ebay.com
16.
 
Sony A775/591/100..81/100..5/5 Aug 2011 US$ 1 399ebay.com
17.
 
Sony A66004/5+4/583/1004.5/54/5 Aug 2019 US$ 1 399 amazon.com
Note: (+ +) 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. Hence, a score should always be seen in the context of the camera's market launch date and its price, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, please note that some of the review sites have changed their methodology and reporting over time.

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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. 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-M10 IV 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-M10 IV Sony A77 II
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Micro Four Thirds lenses Sony A mount lenses
    Launch Date August 2020 May 2014
    Launch Price USD 699 USD 1,199
    Sensor Specs Olympus E-M10 IV 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 20.2 Megapixels 24 Megapixels
    Image Resolution 5184 x 3888 pixels 6000 x 4000 pixels
    Pixel Pitch 3.34 μm 3.91 μm
    Pixel Density 8.96 MP/cm2 6.55 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 - 51,200 ISO
    Image Processor TruePic VIII BIONZ X
    DXO Sensor Quality (score) .. 82
    DXO Color Depth (bits) .. 24.4
    DXO Dynamic Range (EV) .. 13.4
    DXO Low Light (ISO) .. 1013
    Screen Specs Olympus E-M10 IV Sony A77 II
    Viewfinder Type Electronic viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.62x 0.73x
    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 A77 II
    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 12 shutter flaps/s
    Electronic Shutterup to 1/16000sno E-Shutter
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash Built-in Flash Built-in Flash
    Storage Medium SDXC cards MS or SDXC cards
    Single or Dual Card Slots Single card slot Single card slot
    UHS card support UHS-II UHS-I
    Connectivity Specs Olympus E-M10 IV 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 micro HDMI mini HDMI
    Microphone Port no MIC socket External MIC port
    Wifi Support Wifi built-in Wifi built-in
    Near-Field Communication no NFC NFC built-in
    Bluetooth Support Bluetooth built-in no Bluetooth
    Body Specs Olympus E-M10 IV Sony A77 II
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type Olympus BLS-50 Sony NP-FM500H
    Battery Life (CIPA)360 shots per charge480 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)
    143 x 104 x 81 mm
    (5.6 x 4.1 x 3.2 in)
    Camera Weight 383 g (13.5 oz) 647 g (22.8 oz)
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