Olympus E-M5 II vs Sony A7S II
The Olympus OM-D E-M5 Mark II and the Sony Alpha 7S II are two digital cameras that were officially introduced, respectively, in February 2015 and September 2015. Both the E-M5 II and the A7S II are mirrorless interchangeable lens cameras that are based on a Four Thirds (E-M5 II) and a full frame (A7S II) sensor. The Olympus has a resolution of 15.9 megapixels, whereas the Sony provides 12 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.
Going beyond this snapshot of core features and characteristics, what are the differences between the Olympus OM-D E-M5 Mark II and the Sony Alpha 7S 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.
The physical size and weight of the Olympus E-M5 II and the Sony A7S 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 measures are rounded to the nearest millimeter.
The E-M5 II can be obtained in two different colors (black, silver), while the A7S II is only available in black.
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7S II is notably larger (16 percent) than the Olympus E-M5 II. Moreover, the A7S II is markedly heavier (34 percent) than the E-M5 II. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.
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. A larger imaging sensor will tend to go along with bigger and heavier lenses, although exceptions exist. You can compare the optics available for the two cameras in the Micro Four Thirds Lens Catalog (E-M5 II) and the Sony FE Lens Catalog (A7S II). Mirrorless cameras, such as the two under consideration, have the additional advantage of having a short flange to focal plane distance, which makes it possible to mount many lenses from other systems onto the camera via adapters.
Concerning battery life, the E-M5 II gets 310 shots out of its BLN-1 battery, while the A7S II can take 370 images on a single charge of its NP-FW50 power pack. The power pack in the A7S II can be charged via the USB port, which can be very convenient when travelling.
The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. 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.
|1.||Olympus E-M5 II||124 mm||85 mm||45 mm||469 g||310||Y||Feb 2015||1,099||ebay.com|
|2.||Sony A7S II||127 mm||96 mm||60 mm||627 g||370||Y||Sep 2015||2,999||ebay.com|
|3.||Olympus E-M5 III||125 mm||85 mm||50 mm||414 g||310||Y||Oct 2019||1,199||amazon.com|
|4.||Olympus PEN-F||125 mm||72 mm||37 mm||427 g||330||n||Jan 2016||1,199||ebay.com|
|5.||Olympus E-M10 II||120 mm||83 mm||47 mm||390 g||320||n||Aug 2015||649||ebay.com|
|6.||Olympus E-M10||119 mm||82 mm||46 mm||396 g||320||n||Jan 2014||699||ebay.com|
|7.||Olympus E-M1||130 mm||94 mm||63 mm||497 g||350||Y||Sep 2013||1,399||ebay.com|
|8.||Olympus E-P5||122 mm||69 mm||37 mm||420 g||330||n||May 2013||999||ebay.com|
|9.||Olympus E-M5||122 mm||89 mm||43 mm||425 g||360||Y||Feb 2012||1,299||ebay.com|
|10.||Panasonic G85||128 mm||89 mm||74 mm||505 g||330||Y||Sep 2016||899||ebay.com|
|11.||Panasonic GX85||122 mm||71 mm||44 mm||426 g||290||n||Apr 2016||799||amazon.com|
|12.||Panasonic GX8||133 mm||78 mm||63 mm||487 g||330||Y||Jul 2015||1,199||ebay.com|
|13.||Sony A7 IV||131 mm||96 mm||80 mm||659 g||580||Y||Oct 2021||2,499||amazon.com|
|14.||Sony A7S III||127 mm||97 mm||81 mm||699 g||600||Y||Jul 2020||3,499||amazon.com|
|15.||Sony A7R II||127 mm||96 mm||60 mm||625 g||290||Y||Jun 2015||3,199||ebay.com|
|16.||Sony A7 II||127 mm||96 mm||60 mm||599 g||350||Y||Nov 2014||1,999||ebay.com|
|17.||Sony A7S||127 mm||94 mm||48 mm||489 g||380||Y||Apr 2014||2,499||ebay.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-M5 II was launched at a markedly lower price (by 63 percent) than the A7S II, 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.
The size of the imaging sensor is a crucial determinant of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels in a sensor of the same technological generation. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its 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-M5 II features a Four Thirds sensor and the Sony A7S II a full frame sensor. The sensor area in the A7S II is 276 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-M5 II has a native 4:3 aspect ratio, while the one in the A7S II offers a 3:2 aspect.
Despite having a smaller sensor, the Olympus E-M5 II offers a higher resolution of 15.9 megapixels, compared with 12 MP of the Sony A7S II. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.76μm versus 8.40μm for the A7S II). Moreover, it should be noted that the A7S II is a somewhat more recent model (by 7 months) than the E-M5 II, 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 Olympus E-M5 II implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the E-M5 II for good quality output (200 dots per inch) amounts to 23 x 17.3 inches or 58.5 x 43.9 cm, for very good quality (250 dpi) 18.4 x 13.8 inches or 46.8 x 35.1 cm, and for excellent quality (300 dpi) 15.4 x 11.5 inches or 39 x 29.3 cm. The corresponding values for the Sony A7S II are 21.2 x 14.2 inches or 53.8 x 36 cm for good quality, 17 x 11.3 inches or 43.1 x 28.8 cm for very good quality, and 14.1 x 9.4 inches or 35.9 x 24 cm for excellent quality prints.
Unlike the A7S II, the E-M5 II has the capacity to capture high quality composite images (40MP) by combining multiple shots after shifting its sensor by miniscule distances. This multi-shot, pixel-shift mode is most suitable for photography of stationary objects (landscapes, studio scenes).
The Olympus OM-D E-M5 Mark II 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 7S II are ISO 100 to ISO 102400, with the possibility to increase the ISO range to 50-409600.
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.
Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service is based on lab testing and assigns an overall score to each camera sensor, as well as ratings for dynamic range ("DXO Landscape"), color depth ("DXO Portrait"), and low-light sensitivity ("DXO Sports"). Of the two cameras under consideration, the A7S II offers substantially better image quality than the E-M5 II (overall score 12 points higher). The advantage is based on 0.6 bits higher color depth, 0.8 EV in additional dynamic range, and 1.8 stops in additional low light sensitivity. The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.
|1.||Olympus E-M5 II||Four Thirds||15.9||4608||3456||1080/60p||23.0||12.5||842||73|
|2.||Sony A7S II||Full Frame||12.0||4240||2832||4K/30p||23.6||13.3||2993||85|
|3.||Olympus E-M5 III||Four Thirds||20.2||5184||3888||4K/30p||23.3||13.1||1324||76|
|4.||Olympus PEN-F||Four Thirds||20.2||5184||3888||1080/60p||23.1||12.4||894||74|
|5.||Olympus E-M10 II||Four Thirds||15.9||4608||3456||1080/60p||23.1||12.5||842||73|
|6.||Olympus E-M10||Four Thirds||15.9||4608||3456||1080/30p||22.8||12.3||884||72|
|7.||Olympus E-M1||Four Thirds||15.9||4608||3456||1080/30p||23.0||12.7||757||73|
|8.||Olympus E-P5||Four Thirds||15.9||4608||3456||1080/30p||22.8||12.4||895||72|
|9.||Olympus E-M5||Four Thirds||15.9||4608||3456||1080/60i||22.8||12.3||826||71|
|10.||Panasonic G85||Four Thirds||15.8||4592||3448||4K/30p||22.8||12.5||656||71|
|11.||Panasonic GX85||Four Thirds||15.8||4592||3448||4K/30p||22.9||12.6||662||71|
|12.||Panasonic GX8||Four Thirds||20.2||5184||3888||4K/30p||23.5||12.6||806||75|
|13.||Sony A7 IV||Full Frame||32.7||7008||4672||4K/60p||25.4||14.7||3379||97|
|14.||Sony A7S III||Full Frame||12.0||4240||2832||4K/120p||23.7||13.9||2520||86|
|15.||Sony A7R II||Full Frame||42.2||7952||5304||4K/30p||26.0||13.9||3434||98|
|16.||Sony A7 II||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90|
|17.||Sony A7S||Full Frame||12.0||4240||2832||1080/60p||23.9||13.2||3702||87|
|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. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the A7S II provides a better video resolution than the E-M5 II. It can shoot movie footage at 4K/30p, while the Olympus is limited to 1080/60p.
Beyond body and sensor, cameras can and do differ across a range of features. The two cameras under review are similar with respect to both having an electronic viewfinder. However, the one in the A7S II offers a slightly higher resolution than the one in the E-M5 II (2400k vs 2360k dots). The table below summarizes some of the other core capabilities of the Olympus E-M5 II and Sony A7S II in connection with corresponding information for a sample of similar cameras.
|1.||Olympus E-M5 II||2360||n||3.0 / 1037||swivel||Y||1/8000s||10.0/s||n||Y|
|2.||Sony A7S II||2400||n||3.0 / 1229||tilting||n||1/8000s||5.0/s||n||Y|
|3.||Olympus E-M5 III||2360||n||3.0 / 1040||swivel||Y||1/8000s||10.0/s||n||Y|
|4.||Olympus PEN-F||2360||n||3.0 / 1037||swivel||Y||1/8000s||10.0/s||n||Y|
|5.||Olympus E-M10 II||2360||n||3.0 / 1040||tilting||Y||1/4000s||8.0/s||Y||Y|
|6.||Olympus E-M10||1440||n||3.0 / 1037||tilting||Y||1/4000s||8.0/s||Y||Y|
|7.||Olympus E-M1||2360||n||3.0 / 1037||tilting||Y||1/8000s||10.0/s||n||Y|
|8.||Olympus E-P5||optional||n||3.0 / 1037||tilting||Y||1/8000s||9.0/s||Y||Y|
|9.||Olympus E-M5||1440||n||3.0 / 610||tilting||Y||1/4000s||9.0/s||n||Y|
|10.||Panasonic G85||2360||n||3.0 / 1040||swivel||Y||1/4000s||9.0/s||Y||Y|
|11.||Panasonic GX85||2765||n||3.0 / 1040||tilting||Y||1/4000s||8.0/s||Y||Y|
|12.||Panasonic GX8||2360||n||3.0 / 1040||swivel||Y||1/8000s||10.0/s||n||Y|
|13.||Sony A7 IV||3686||n||3.0 / 1037||swivel||Y||1/8000s||10.0/s||n||Y|
|14.||Sony A7S III||9440||n||3.0 / 1440||swivel||Y||1/8000s||10.0/s||n||Y|
|15.||Sony A7R II||2400||n||3.0 / 1229||tilting||n||1/8000s||5.0/s||n||Y|
|16.||Sony A7 II||2400||n||3.0 / 1230||tilting||n||1/8000s||5.0/s||n||Y|
|17.||Sony A7S||2400||n||3.0 / 921||tilting||n||1/8000s||5.0/s||n||n|
|Notes: *) 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-M5 II has a touchscreen, while the A7S II has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.The E-M5 II has an articulated LCD that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in snapping selfies. In contrast, the A7S II does not have a selfie-screen.
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, both cameras under consideration feature an 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-M5 II 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-M5 II writes its imaging data to SDXC cards, while the A7S II uses SDXC or Memory Stick PRO Duo cards. The E-M5 II supports UHS-II cards (Ultra High Speed data transfer of up to 312 MB/s), while the A7S II can use UHS-I cards (up to 104 MB/s).
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-M5 Mark II and Sony Alpha 7S II and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
Mic / Speaker
|1.||Olympus E-M5 II||Y||stereo / mono||Y||-||micro||2.0||Y||-||-|
|2.||Sony A7S II||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|3.||Olympus E-M5 III||Y||stereo / mono||Y||-||micro||2.0||Y||-||Y|
|4.||Olympus PEN-F||Y||stereo / mono||-||-||micro||2.0||Y||-||-|
|5.||Olympus E-M10 II||Y||stereo / mono||-||-||micro||2.0||Y||-||-|
|6.||Olympus E-M10||Y||stereo / mono||-||-||micro||2.0||Y||-||-|
|7.||Olympus E-M1||Y||stereo / mono||Y||-||micro||2.0||Y||-||-|
|8.||Olympus E-P5||Y||stereo / mono||-||-||micro||2.0||Y||-||-|
|9.||Olympus E-M5||Y||stereo / mono||-||-||mini||2.0||-||-||-|
|10.||Panasonic G85||Y||stereo / mono||Y||-||micro||2.0||Y||-||-|
|11.||Panasonic GX85||Y||stereo / mono||-||-||micro||2.0||Y||-||-|
|12.||Panasonic GX8||Y||stereo / mono||Y||-||micro||2.0||Y||Y||-|
|13.||Sony A7 IV||Y||stereo / mono||Y||Y||full||3.2||Y||-||Y|
|14.||Sony A7S III||Y||stereo / mono||Y||Y||full||3.2||Y||-||Y|
|15.||Sony A7R II||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|16.||Sony A7 II||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|17.||Sony A7S||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
It is notable that the A7S II has a headphone jack, which makes it possible to attach external headphones and monitor the quality of sound during the recording process. The E-M5 II lacks such a headphone port.
Studio photographers will appreciate that the Olympus E-M5 II (unlike the A7S II) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
Both the E-M5 II and the A7S II have been discontinued, but can regularly be found used on ebay. The E-M5 II was replaced by the Olympus E-M5 III, while the A7S II was followed by the Sony A7S III. Further information on the features and operation of the E-M5 II and A7S II can be found, respectively, in the Olympus E-M5 II Manual (free pdf) or the online Sony A7S II Manual.
So what is the bottom line? Is there a clear favorite between the Olympus E-M5 II and the Sony A7S II? Which camera is better? A synthesis of the relative strong points of each of the models is listed below.
Advantages of the Olympus OM-D E-M5 Mark II:
- More detail: Offers more megapixels (15.9 vs 12MP) with a 13% higher linear resolution.
- High quality composites: Can combine several shots after pixel-shifting its sensor.
- More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
- Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
- More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
- Faster burst: Shoots at higher frequency (10 vs 5 flaps/sec) to capture the decisive moment.
- Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
- More compact: Is smaller (124x85mm vs 127x96mm) and thus needs less room in the bag.
- Less heavy: Is lighter (by 158g or 25 percent) and hence easier to carry around.
- Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
- 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 (63 percent cheaper at launch).
- More heavily discounted: Has been on the market for longer (launched in February 2015).
Reasons to prefer the Sony Alpha 7S II:
- Better image quality: Scores substantially higher (12 points) in the DXO overall evaluation.
- More dynamic range: Captures a broader range of light and dark details (0.8 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (1.8 stops ISO advantage).
- Better video: Provides higher definition movie capture (4K/30p vs 1080/60p).
- Better sound control: Has a headphone port that enables audio monitoring while recording.
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.74x).
- More detailed LCD: Has a higher resolution rear screen (1229k vs 1037k dots).
- Longer lasting: Gets more shots (370 versus 310) out of a single battery charge.
- Easier travel charging: Can be conveniently charged via its USB port.
- Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
- More modern: Was introduced somewhat (7 months) more recently.
If the number of relative strengths (bullet points above) is taken as a guide, the E-M5 II emerges as the winner of the contest (13 : 11 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 sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape shooter. Hence, the decision which camera is best and worth buying is often a very personal one.
How about other alternatives? Do the specifications of the Olympus E-M5 II and the Sony A7S II place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera listing 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-M5 II or the A7S II perform in practice. 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.
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 (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.
|1.||Olympus E-M5 II||5/5||+ +||4.5/5||81/100||5/5||5/5||Feb 2015||1,099||ebay.com|
|2.||Sony A7S II||5/5||+||..||..||4.5/5||5/5||Sep 2015||2,999||ebay.com|
|3.||Olympus E-M5 III||5/5||+||5/5||82/100||4.5/5||4.5/5||Oct 2019||1,199||amazon.com|
|4.||Olympus PEN-F||..||..||4/5||82/100||4.5/5||5/5||Jan 2016||1,199||ebay.com|
|5.||Olympus E-M10 II||4.5/5||+ +||..||80/100||5/5||5/5||Aug 2015||649||ebay.com|
|6.||Olympus E-M10||4/5||..||..||80/100||5/5||5/5||Jan 2014||699||ebay.com|
|7.||Olympus E-M1||5/5||+ +||..||84/100||4.5/5||4.5/5||Sep 2013||1,399||ebay.com|
|8.||Olympus E-P5||5/5||+ +||..||78/100||4.5/5||5/5||May 2013||999||ebay.com|
|9.||Olympus E-M5||4/5||+ +||..||80/100||4.5/5||5/5||Feb 2012||1,299||ebay.com|
|10.||Panasonic G85||..||+ +||..||84/100||5/5||4.5/5||Sep 2016||899||ebay.com|
|11.||Panasonic GX85||4.5/5||+ +||..||82/100||5/5||5/5||Apr 2016||799||amazon.com|
|12.||Panasonic GX8||5/5||+||..||82/100||4.5/5||4.5/5||Jul 2015||1,199||ebay.com|
|13.||Sony A7 IV||5/5||+ +||4.5/5||89/100||4.5/5||4.5/5||Oct 2021||2,499||amazon.com|
|14.||Sony A7S III||4.5/5||+ +||5/5||91/100||4.5/5||5/5||Jul 2020||3,499||amazon.com|
|15.||Sony A7R II||5/5||+ +||5/5||90/100||5/5||5/5||Jun 2015||3,199||ebay.com|
|16.||Sony A7 II||5/5||+||4/5||82/100||4.5/5||5/5||Nov 2014||1,999||ebay.com|
|17.||Sony A7S||4/5||..||..||86/100||4.5/5||5/5||Apr 2014||2,499||ebay.com|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
The review scores listed above should be treated 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 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.
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 make a corresponding selection in the search boxes below. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.
- Canon 500D vs Sony A7S II
- Canon D30 vs Sony A7S II
- Canon M10 vs Olympus E-M5 II
- Leica M9 vs Olympus E-M5 II
- Leica Q Typ 116 vs Olympus E-M5 II
- Leica SL vs Sony A7S II
- Leica V-LUX 4 vs Sony A7S II
- Nikon D300S vs Olympus E-M5 II
- Olympus E-410 vs Olympus E-M5 II
- Olympus E-M5 II vs Sony A77
- Sony A7S II vs Sony RX100
- Sony A7S II vs Sony RX100 IV
Specifications: Olympus E-M5 II vs Sony A7S 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 Model||Olympus E-M5 II||Sony A7S II|
|Camera Type||Mirrorless system camera||Mirrorless system camera|
|Camera Lens||Micro Four Thirds lenses||Sony E mount lenses|
|Launch Date||February 2015||September 2015|
|Launch Price||USD 1,099||USD 2,999|
|Sensor Specs||Olympus E-M5 II||Sony A7S II|
|Sensor Format||Four Thirds Sensor||Full Frame Sensor|
|Sensor Size||17.3 x 13.0 mm||35.6 x 23.8 mm|
|Sensor Area||224.9 mm2||847.28 mm2|
|Sensor Diagonal||21.6 mm||42.8 mm|
|Sensor Resolution||15.9 Megapixels||12 Megapixels|
|Image Resolution||4608 x 3456 pixels||4240 x 2832 pixels|
|Pixel Pitch||3.76 μm||8.40 μm|
|Pixel Density||7.08 MP/cm2||1.42 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||1080/60p Video||4K/30p Video|
|ISO Setting||200 - 25,600 ISO||100 - 102,400 ISO|
|ISO Boost||100 - 25,600 ISO||50 - 409,600 ISO|
|Image Processor||TruePic VII||BIONZ X|
|DXO Sensor Quality (score)||73||85|
|DXO Color Depth (bits)||23.0||23.6|
|DXO Dynamic Range (EV)||12.5||13.3|
|DXO Low Light (ISO)||842||2993|
|Screen Specs||Olympus E-M5 II||Sony A7S II|
|Viewfinder Type||Electronic viewfinder||Electronic viewfinder|
|Viewfinder Field of View||100%||100%|
|Viewfinder Resolution||2360k dots||2400k dots|
|LCD Framing||Live View||Live View|
|Rear LCD Size||3.0inch||3.0inch|
|LCD Resolution||1037k dots||1229k dots|
|LCD Attachment||Swivel screen||Tilting screen|
|Touch Input||Touchscreen||no Touchscreen|
|Shooting Specs||Olympus E-M5 II||Sony A7S II|
|Focus System||Contrast-detect AF||Contrast-detect AF|
|Manual Focusing Aid||Focus Peaking||Focus Peaking|
|Max Shutter Speed (mechanical)||1/8000s||1/8000s|
|Continuous Shooting||10 shutter flaps/s||5 shutter flaps/s|
|Electronic Shutter||up to 1/16000s||YES|
|Time-Lapse Photography||Intervalometer built-in||no Intervalometer|
|Image Stabilization||In-body stabilization||In-body stabilization|
|Fill Flash||no On-Board Flash||no On-Board 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-M5 II||Sony A7S II|
|Studio Flash||PC Sync socket||no PC Sync|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||micro HDMI||micro HDMI|
|Microphone Port||External MIC port||External MIC port|
|Headphone Socket||no Headphone port||Headphone port|
|Wifi Support||Wifi built-in||Wifi built-in|
|Near-Field Communication||no NFC||NFC built-in|
|Body Specs||Olympus E-M5 II||Sony A7S II|
|Environmental Sealing||Weathersealed body||Weathersealed body|
|Battery Life (CIPA)||310 shots per charge||370 shots per charge|
|In-Camera Charging||no USB charging||USB charging|
124 x 85 x 45 mm
(4.9 x 3.3 x 1.8 in)
127 x 96 x 60 mm
(5.0 x 3.8 x 2.4 in)
|Camera Weight||469 g (16.5 oz)||627 g (22.1 oz)|
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