Olympus E-M1 II vs Sony A7S
The Olympus OM-D E-M1 Mark II and the Sony Alpha A7S are two digital cameras that were announced, respectively, in September 2016 and April 2014. Both the E-M1 II and the A7S are mirrorless interchangeable lens cameras that are based on a Four Thirds (E-M1 II) and a full frame (A7S) sensor. The Olympus has a resolution of 20.2 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.
|Olympus E-M1 II||Sony A7S|
|Mirrorless system camera||Mirrorless system camera|
|Micro Four Thirds lenses||Sony E mount lenses|
|20.2 MP, Four Thirds Sensor||12 MP, Full Frame Sensor|
|4K/30p Video||1080/60p Video|
|ISO 200-25600||ISO 100-102400 (50-409600)|
|Electronic viewfinder (2360k dots)||Electronic viewfinder (2400k dots)|
|3.0" LCD, 1037k dots||3.0" LCD, 921k dots|
|Swivel touchscreen||Tilting screen (not touch-sensitive)|
|18 shutter flaps per second||5 shutter flaps per second|
|In-body stabilization||Lens stabilization only|
|Weathersealed body||Weathersealed body|
|440 shots per battery charge||380 shots per battery charge|
|134 x 91 x 67 mm, 574 g||127 x 94 x 48 mm, 489 g|
Going beyond this snapshot of core features and characteristics, what are the differences between the Olympus OM-D E-M1 Mark II and the Sony Alpha A7S? 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 side-by-side display below illustrates the physical size and weight of the Olympus E-M1 II and the Sony A7S. 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.
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7S is somewhat smaller (2 percent) than the Olympus E-M1 II. Moreover, the A7S is markedly lighter (15 percent) than the E-M1 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-M1 II) and the Sony FE Lens Catalog (A7S). 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-M1 II gets 440 shots out of its BLH-1 battery, while the A7S can take 380 images on a single charge of its NP-FW50 power pack. The power pack in the A7S 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, 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.
|Olympus E-M1 II»||5.3 in||3.6 in||2.6 in||20.2 oz||440||Y||Sep 2016||1,999||Olympus E-M1 II|
|Sony A7S«||5.0 in||3.7 in||1.9 in||17.2 oz||380||Y||Apr 2014||2,499||-||Sony A7S|
|Nikon Df« »||5.7 in||4.3 in||2.6 in||26.8 oz||1400||Y||Nov 2013||2,749||Nikon Df|
|Olympus PEN-F« »||4.9 in||2.8 in||1.5 in||15.1 oz||330||n||Jan 2016||1,199||Olympus PEN-F|
|Olympus E-M5 II« »||4.9 in||3.3 in||1.8 in||16.5 oz||310||Y||Feb 2015||1,099||Olympus E-M5 II|
|Olympus E-M1« »||5.1 in||3.7 in||2.5 in||17.5 oz||350||Y||Sep 2013||1,399||-||Olympus E-M1|
|Panasonic G9« »||5.4 in||3.8 in||3.6 in||23.2 oz||400||Y||Nov 2017||1,699||Panasonic G9|
|Panasonic GH5« »||5.5 in||3.9 in||3.4 in||25.6 oz||410||Y||Jan 2017||1,999||Panasonic GH5|
|Panasonic G85« »||5.0 in||3.5 in||2.9 in||17.8 oz||330||Y||Sep 2016||899||-||Panasonic G85|
|Panasonic GX8« »||5.2 in||3.1 in||2.5 in||17.2 oz||330||Y||Jul 2015||1,199||-||Panasonic GX8|
|Sony A7 III« »||5.0 in||3.8 in||2.9 in||22.9 oz||610||Y||Feb 2018||1,999||Sony A7 III|
|Sony A9« »||5.0 in||3.8 in||2.5 in||23.7 oz||650||Y||Apr 2017||4,499||Sony A9|
|Sony A7S II« »||5.0 in||3.8 in||2.4 in||22.1 oz||370||Y||Sep 2015||2,999||Sony A7S II|
|Sony A7 II« »||5.0 in||3.8 in||2.4 in||21.1 oz||350||Y||Nov 2014||1,999||-||Sony A7 II|
|Sony A7« »||5.0 in||3.7 in||1.9 in||16.7 oz||340||Y||Oct 2013||1,699||-||Sony A7|
|Sony A7R« »||5.0 in||3.7 in||1.9 in||16.4 oz||340||Y||Oct 2013||2,299||-||Sony A7R|
|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-M1 II was launched at a somewhat lower price (by 20 percent) than the A7S, which makes it more attractive for photographers on a tight budget. 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.
The size of the imaging sensor is a crucial determinant 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 tend to be associated with larger, more expensive camera bodies and lenses.
Of the two cameras under consideration, the Olympus E-M1 II features a Four Thirds sensor and the Sony A7S a full frame sensor. The sensor area in the A7S is 280 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-M1 II has a native 4:3 aspect ratio, while the one in the A7S offers a 3:2 aspect.
Despite having a smaller sensor, the Olympus E-M1 II offers a higher resolution of 20.2 megapixels, compared with 12 MP of the Sony A7S. 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 3.34μm versus 8.45μm for the A7S). However, it should be noted that the E-M1 II is much more recent (by 2 years and 5 months) than the A7S, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently. Coming back to sensor resolution, it should be mentioned that the E-M1 II has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.
The resolution advantage of the Olympus E-M1 II implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the E-M1 II for good quality output (200 dots per inch) amounts to 25.9 x 19.4 inch or 65.8 x 49.4 cm, for very good quality (250 dpi) 20.7 x 15.6 inch or 52.7 x 39.5 cm, and for excellent quality (300 dpi) 17.3 x 13 inch or 43.9 x 32.9 cm. The corresponding values for the Sony A7S are 21.2 x 14.2 inch or 53.8 x 36 cm for good quality, 17 x 11.3 inch or 43.1 x 28.8 cm for very good quality, and 14.1 x 9.4 inch or 35.9 x 24 cm for excellent quality prints.
The E-M1 II has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
Unlike the A7S, the E-M1 II has the capacity to capture high quality composite images (50MP) 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-M1 Mark II has a native sensitivity range from ISO 200 to ISO 25600, which can be extended to ISO 64-25600. The corresponding ISO settings for the Sony Alpha A7S are ISO 100 to ISO 102400, with the possibility to increase the ISO range to 50-409600.
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 has a markedly higher DXO score than the E-M1 II (overall score 7 points higher), which will translate into better image quality. The advantage is based on 0.2 bits higher color depth, 0.4 EV in additional dynamic range, and 1.5 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.
|Olympus E-M1 II»||Four Thirds||20.2||5184||3888||4K/30p||23.7||12.8||1312||80||Olympus E-M1 II|
|Sony A7S«||Full Frame||12.0||4240||2832||1080/60p||23.9||13.2||3702||87||Sony A7S|
|Nikon Df« »||Full Frame||16.2||4928||3280||-||24.6||13.1||3279||89||Nikon Df|
|Olympus PEN-F« »||Four Thirds||20.2||5184||3888||1080/60p||23.1||12.4||894||74||Olympus PEN-F|
|Olympus E-M5 II« »||Four Thirds||15.9||4608||3456||1080/60p||23.0||12.5||842||73||Olympus E-M5 II|
|Olympus E-M1« »||Four Thirds||15.9||4608||3456||1080/30p||23.0||12.7||757||73||Olympus E-M1|
|Panasonic G9« »||Four Thirds||20.2||5184||3888||4K/60p||-||-||-||-||Panasonic G9|
|Panasonic GH5« »||Four Thirds||20.2||5184||3888||4K/60p||23.9||13.0||807||77||Panasonic GH5|
|Panasonic G85« »||Four Thirds||15.8||4592||3448||4K/30p||22.8||12.5||656||71||Panasonic G85|
|Panasonic GX8« »||Four Thirds||20.2||5184||3888||4K/30p||23.5||12.6||806||75||Panasonic GX8|
|Sony A7 III« »||Full Frame||24.0||6000||4000||4K/30p||25.0||14.7||3730||96||Sony A7 III|
|Sony A9« »||Full Frame||24.0||6000||4000||4K/30p||24.9||13.3||3517||92||Sony A9|
|Sony A7S II« »||Full Frame||12.0||4240||2832||4K/30p||23.6||13.3||2993||85||Sony A7S II|
|Sony A7 II« »||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90||Sony A7 II|
|Sony A7« »||Full Frame||24.0||6000||4000||1080/60p||24.8||14.2||2248||90||Sony A7|
|Sony A7R« »||Full Frame||36.2||7360||4912||1080/60p||25.6||14.1||2746||95||Sony A7R|
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 E-M1 II provides a higher video resolution than the A7S. It can shoot video footage at 4K/30p, while the Sony is limited to 1080/60p.
Apart from body and sensor, cameras can and do differ across a variety of features. The two cameras under review are similar with respect to both having an electronic viewfinder. However, the one in the A7S offers a slightly higher resolution than the one in the E-M1 II (2400k vs 2360k dots). The following table reports on some other key feature differences and similarities of the Olympus E-M1 II, the Sony A7S, and comparable cameras.
|Olympus E-M1 II»||2360||n||3.0||1037||swivel||Y||1/8000s||18.0||n||Y||Olympus E-M1 II|
|Sony A7S«||2400||n||3.0||921||tilting||n||1/8000s||5.0||n||n||Sony A7S|
|Nikon Df« »||optical||Y||3.2||921||fixed||n||1/4000s||5.5||n||n||Nikon Df|
|Olympus PEN-F« »||2360||n||3.0||1037||swivel||Y||1/8000s||10.0||n||Y||Olympus PEN-F|
|Olympus E-M5 II« »||2360||n||3.0||1037||swivel||Y||1/8000s||10.0||n||Y||Olympus E-M5 II|
|Olympus E-M1« »||2360||n||3.0||1037||tilting||Y||1/8000s||10.0||n||Y||Olympus E-M1|
|Panasonic G9« »||3680||Y||3.0||1040||swivel||Y||1/8000s||20.0||n||Y||Panasonic G9|
|Panasonic GH5« »||3680||n||3.2||1620||swivel||Y||1/8000s||12.0||n||Y||Panasonic GH5|
|Panasonic G85« »||2360||n||3.0||1040||swivel||Y||1/4000s||9.0||Y||Y||Panasonic G85|
|Panasonic GX8« »||2360||n||3.0||1040||swivel||Y||1/8000s||10.0||n||Y||Panasonic GX8|
|Sony A7 III« »||2359||n||3.0||922||tilting||Y||1/8000s||10.0||n||Y||Sony A7 III|
|Sony A9« »||3686||n||3.0||1440||tilting||Y||1/8000s||20.0||n||Y||Sony A9|
|Sony A7S II« »||2400||n||3.0||1229||tilting||n||1/8000s||5.0||n||Y||Sony A7S II|
|Sony A7 II« »||2400||n||3.0||1230||tilting||n||1/8000s||5.0||n||Y||Sony A7 II|
|Sony A7« »||2400||n||3.0||1230||tilting||n||1/8000s||5.0||n||n||Sony A7|
|Sony A7R« »||2400||n||3.0||1230||tilting||n||1/8000s||4.0||n||n||Sony A7R|
One feature that differentiates the E-M1 II and the A7S is in-body image stabilization (IBIS). The E-M1 II reduces the risk of handshake-induced blur with all attached lenses, while the A7S has to rely on optical image stabilization in OIS-equipped lenses to achieve the same effect.The E-M1 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 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-M1 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-M1 II writes its imaging data to SDXC cards, while the A7S uses SDXC or Memory Stick PRO Duo cards. The E-M1 II features dual card slots, which can be very useful in case a memory card fails. In contrast, the A7S only has one slot. The E-M1 II supports UHS-II cards (on its first slot), while the A7S can use UHS-I cards.
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-M1 Mark II and Sony Alpha A7S and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
|Olympus E-M1 II»||Y||stereo||mono||Y||Y||micro||3.0||Y||-||-||Olympus E-M1 II|
|Sony A7S«||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-||Sony A7S|
|Nikon Df« »||Y||-||-||-||-||mini||2.0||-||-||-||Nikon Df|
|Olympus PEN-F« »||Y||stereo||mono||-||-||micro||2.0||Y||-||-||Olympus PEN-F|
|Olympus E-M5 II« »||Y||stereo||mono||Y||-||micro||2.0||Y||-||-||Olympus E-M5 II|
|Olympus E-M1« »||Y||stereo||mono||Y||-||micro||2.0||Y||-||-||Olympus E-M1|
|Panasonic G9« »||Y||stereo||mono||Y||Y||full||3.0||Y||-||Y||Panasonic G9|
|Panasonic GH5« »||Y||stereo||mono||Y||Y||full||3.1||Y||-||Y||Panasonic GH5|
|Panasonic G85« »||Y||stereo||mono||Y||-||micro||2.0||Y||-||-||Panasonic G85|
|Panasonic GX8« »||Y||stereo||mono||Y||-||micro||2.0||Y||Y||-||Panasonic GX8|
|Sony A7 III« »||Y||stereo||mono||Y||Y||micro||3.1||Y||Y||Y||Sony A7 III|
|Sony A9« »||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||Y||Sony A9|
|Sony A7S II« »||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-||Sony A7S II|
|Sony A7 II« »||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-||Sony A7 II|
|Sony A7« »||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-||Sony A7|
|Sony A7R« »||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-||Sony A7R|
Studio photographers will appreciate that the Olympus E-M1 II (unlike the A7S) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
The E-M1 II is a recent model that features in the current product line-up of Olympus. In contrast, the A7S has been discontinued (but it can be found pre-owned on eBay). As a replacement in the same line of cameras, the A7S was succeeded by the Sony A7S 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.
So what is the bottom line? Is the Olympus E-M1 II better than the Sony A7S or vice versa? Below is a summary of the relative strengths of each of the two contestants.
Arguments in favor of the Olympus OM-D E-M1 Mark II:
- More detail: Offers more megapixels (20.2 vs 12MP) with a 27% higher linear resolution.
- Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
- High quality composites: Can combine several shots after pixel-shifting its sensor.
- Better video: Provides higher definition movie capture (4K/30p vs 1080/60p).
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.74x vs 0.71x).
- More detailed LCD: Has a higher resolution rear screen (1037k vs 921k dots).
- 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 (18 vs 5 flaps/sec) to capture the decisive moment.
- Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
- Longer lasting: Can take more shots (440 versus 380) on a single battery charge.
- Sharper images: Has hand-shake reducing image stabilization built-in.
- Faster data transfer: Supports a more advanced USB protocol (3.0 vs 2.0).
- 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.
- Faster buffer clearing: Supports a more advanced SD data transfer standard (UHS-II vs UHS-I).
- More affordable: Was introduced into a lower priced segment (20 percent cheaper at launch).
- More modern: Reflects 2 years and 5 months of technical progress since the A7S launch.
Reasons to prefer the Sony Alpha A7S:
- Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
- Better image quality: Scores markedly higher (7 points) in the DXO overall evaluation.
- Better low-light sensitivity: Can shoot in dim conditions (1.5 stops ISO advantage).
- Less heavy: Has a lower weight (by 85g or 15 percent) and is thus easier to take along.
- 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 heavily discounted: Has been around for much longer (launched in April 2014).
If the number of relative strengths (bullet points above) is taken as a guide, the E-M1 II is the clear winner of the match-up (20 : 6 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 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.
How about other alternatives? Do the specifications of the Olympus E-M1 II and the Sony A7S 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-M1 II or the A7S 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 expert reviews are important. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, and photographyblog). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.
|Olympus E-M1 II»||+ +||85/100||4.5/5||5/5||4.5/5||Sep 2016||1,999||Olympus E-M1 II|
|Sony A7S«||-||86/100||4.5/5||4.5/5||5/5||Apr 2014||2,499||-||Sony A7S|
|Nikon Df« »||-||81/100||4/5||4/5||4/5||Nov 2013||2,749||Nikon Df|
|Olympus PEN-F« »||-||82/100||4.5/5||4.5/5||5/5||Jan 2016||1,199||Olympus PEN-F|
|Olympus E-M5 II« »||+ +||81/100||5/5||4.5/5||5/5||Feb 2015||1,099||Olympus E-M5 II|
|Olympus E-M1« »||+ +||84/100||4.5/5||4.5/5||4.5/5||Sep 2013||1,399||-||Olympus E-M1|
|Panasonic G9« »||+ +||85/100||5/5||5/5||5/5||Nov 2017||1,699||Panasonic G9|
|Panasonic GH5« »||+ +||85/100||4.5/5||5/5||5/5||Jan 2017||1,999||Panasonic GH5|
|Panasonic G85« »||+ +||84/100||5/5||4.5/5||4.5/5||Sep 2016||899||-||Panasonic G85|
|Panasonic GX8« »||+||82/100||4.5/5||5/5||4.5/5||Jul 2015||1,199||-||Panasonic GX8|
|Sony A7 III« »||+ +||89/100||5/5||5/5||5/5||Feb 2018||1,999||Sony A7 III|
|Sony A9« »||+ +||89/100||5/5||5/5||5/5||Apr 2017||4,499||Sony A9|
|Sony A7S II« »||+||-||4.5/5||5/5||5/5||Sep 2015||2,999||Sony A7S II|
|Sony A7 II« »||+||82/100||4.5/5||5/5||5/5||Nov 2014||1,999||-||Sony A7 II|
|Sony A7« »||+ +||80/100||5/5||4.5/5||5/5||Oct 2013||1,699||-||Sony A7|
|Sony A7R« »||+ +||82/100||4.5/5||5/5||5/5||Oct 2013||2,299||-||Sony A7R|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (-) not available.|
Care should be taken when interpreting the review scores above, though. The ratings are only valid when referring to cameras in the same category and of the same age. Hence, a score should always be seen in the context of the camera's market launch date and its price, and 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.
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. 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 G1 X vs Sony A7S II
- Canon G3 X vs Sony A7S
- Canon T7i vs Olympus E-M1 II
- Nikon 1 V1 vs Olympus E-M1 II
- Nikon 1 V3 vs Olympus E-M1 II
- Nikon D3X vs Sony A7S
- Olympus E-420 vs Sony A7S II
- Olympus E-M1 II vs Panasonic GH3
- Olympus E-M1 II vs Ricoh WG-60
- Olympus XZ-2 vs Sony A7S
- Panasonic ZS70 vs Sony A7S II
- Sony A77 II vs Sony A7S II
Specifications: Olympus E-M1 II vs Sony A7S
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-M1 II||Sony A7S|
|Camera Type||Mirrorless system camera||Mirrorless system camera|
|Camera Lens||Micro Four Thirds lenses||Sony E mount lenses|
|Launch Date||September 2016||April 2014|
|Launch Price||USD 1999||USD 2499|
|Sensor Specs||Olympus E-M1 II||Sony A7S|
|Sensor Format||Four Thirds Sensor||Full Frame Sensor|
|Sensor Size||17.3 x 13.0 mm||35.8 x 23.9 mm|
|Sensor Area||224.9 mm2||855.62 mm2|
|Sensor Diagonal||21.6 mm||43 mm|
|Sensor Resolution||20.2 Megapixels||12 Megapixels|
|Image Resolution||5184 x 3888 pixels||4240 x 2832 pixels|
|Pixel Pitch||3.34 μm||8.45 μm|
|Pixel Density||8.96 MP/cm2||1.40 MP/cm2|
|Moiré control||no AA filter||Anti-Alias filter|
|Movie Capability||4K/30p Video||1080/60p Video|
|ISO Setting||200-25600 ISO||100-102400 ISO|
|ISO Boost||64-25600 ISO||50-409600 ISO|
|Image Processor||TruePic VIII||BIONZ X|
|DXO Sensor Quality (score)||80||87|
|DXO Color Depth (bits)||23.7||23.9|
|DXO Dynamic Range (EV)||12.8||13.2|
|DXO Low Light (ISO)||1312||3702|
|Screen Specs||Olympus E-M1 II||Sony A7S|
|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||3.0 inch||3.0 inch|
|LCD Resolution||1037k dots||921k dots|
|LCD Attachment||Swivel screen||Tilting screen|
|Touch Input||Touchscreen||no Touchscreen|
|Shooting Specs||Olympus E-M1 II||Sony A7S|
|Autofocus System||On-Sensor Phase-detect||Contrast-detect AF|
|Manual Focusing Aid||Focus Peaking||Focus Peaking|
|Max Shutter Speed (mechanical)||1/8000/s||1/8000/s|
|Continuous Shooting||18 shutter flaps/s||5 shutter flaps/s|
|Electronic Shutter||up to 1/32000s||YES|
|Time-Lapse Photography||Intervalometer built-in||no Intervalometer|
|Image Stabilization||In-body stabilization||Lens stabilization only|
|Fill Flash||no On-Board Flash||no On-Board Flash|
|Storage Medium||SDXC cards||MS or SDXC cards|
|Second Storage Option||Dual card slots||Single card slot|
|UHS card support||Single UHS-II||UHS-I|
|Connectivity Specs||Olympus E-M1 II||Sony A7S|
|Studio Flash||PC Sync socket||no PC Sync|
|USB Connector||USB 3.0||USB 2.0|
|HDMI Port||micro HDMI||micro HDMI|
|Microphone Port||External MIC port||External MIC port|
|Headphone Socket||Headphone port||Headphone port|
|Wifi Support||Wifi built-in||Wifi built-in|
|Near-Field Communication||no NFC||NFC built-in|
|Body Specs||Olympus E-M1 II||Sony A7S|
|Environmental Sealing||Weathersealed body||Weathersealed body|
|Battery Life (CIPA)||440 shots per charge||380 shots per charge|
|In-Camera Charging||no USB charging||USB charging|
134 x 91 x 67 mm
(5.3 x 3.6 x 2.6 in)
127 x 94 x 48 mm
(5.0 x 3.7 x 1.9 in)
|Camera Weight||574 g (20.2 oz)||489 g (17.2 oz)|
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