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Olympus E-M1 II vs Sony A1

The Olympus OM-D E-M1 Mark II and the Sony A1 are two digital cameras that were revealed to the public, respectively, in September 2016 and January 2021. Both the E-M1 II and the A1 are mirrorless interchangeable lens cameras that are based on a Four Thirds (E-M1 II) and a full frame (A1) sensor. The Olympus has a resolution of 20.2 megapixels, whereas the Sony provides 49.8 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Olympus E-M1 II versus Sony A1
Olympus E-M1 II Sony A1
Mirrorless system camera Mirrorless system camera
Micro Four Thirds lenses Sony E mount lenses
20.2 MP, Four Thirds Sensor 49.8 MP, Full Frame Sensor
4K/30p Video 8k/30p Video
ISO 200-25,600 ISO 100-32,000 (500 - 102,400)
Electronic viewfinder (2360k dots) Electronic viewfinder (9437k dots)
3.0 LCD, 1037k dots 3.0 LCD, 1440k dots
Swivel touchscreen Tilting touchscreen
18 shutter flaps per second 10 shutter flaps per second
In-body stabilizationIn-body stabilization
Weathersealed bodyWeathersealed body
440 shots per battery charge530 shots per battery charge
134 x 91 x 67 mm, 574 g 129 x 97 x 81 mm, 737 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 A1? 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 side-by-side display below illustrates the physical size and weight of the Olympus E-M1 II and the Sony A1. 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.

Size Olympus E-M1 II vs Sony A1
Compare E-M1 II versus A1 top
Comparison E-M1 II or A1 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A1 is somewhat larger (3 percent) than the Olympus E-M1 II. Moreover, the A1 is markedly heavier (28 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 (A1). 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 A1 can take 530 images on a single charge of its NP-FZ100 power pack. The power pack in the A1 can be charged via the USB port, which can be very convenient 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-M1 II 134 mm 91 mm 67 mm 574 g 440 Y Sep 2016 1,999 i
2.
 
Sony A1 129 mm 97 mm 81 mm 737 g 530 Y Jan 2021 6,499 i
3.
 
Olympus E-M1 III 134 mm 91 mm 69 mm 580 g 420 Y Feb 2020 1,799 i
4.
 
Olympus PEN-F 125 mm 72 mm 37 mm 427 g 330 n Jan 2016 1,199i
5.
 
Olympus E-M5 II 124 mm 85 mm 45 mm 469 g 310 Y Feb 2015 1,099i
6.
 
Olympus E-M1 130 mm 94 mm 63 mm 497 g 350 Y Sep 2013 1,399i
7.
 
Panasonic G9 137 mm 97 mm 92 mm 658 g 400 Y Nov 2017 1,699 i
8.
 
Panasonic GH5 139 mm 98 mm 87 mm 725 g 410 Y Jan 2017 1,999 i
9.
 
Panasonic G85 128 mm 89 mm 74 mm 505 g 330 Y Sep 2016 899i
10.
 
Panasonic GX8 133 mm 78 mm 63 mm 487 g 330 Y Jul 2015 1,199i
11.
 
Sony A7S III 127 mm 97 mm 81 mm 699 g 600 Y Jul 2020 3,499 i
12.
 
Sony A7R IV 129 mm 96 mm 78 mm 665 g 670 Y Jul 2019 3,499 i
13.
 
Sony A7R III 127 mm 96 mm 74 mm 650 g 650 Y Oct 2017 3,199i
14.
 
Sony A9 127 mm 96 mm 63 mm 673 g 650 Y Apr 2017 4,499i
15.
 
Sony A7R II 127 mm 96 mm 60 mm 625 g 290 Y Jun 2015 3,199i
16.
 
Sony A7 II 127 mm 96 mm 60 mm 599 g 350 Y Nov 2014 1,999i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

Any camera decision will obviously take relative prices into account. 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-M1 II was launched at a markedly lower price (by 69 percent) than the A1, 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.

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Sensor comparison

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. 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-M1 II features a Four Thirds sensor and the Sony A1 a full frame sensor. The sensor area in the A1 is 283 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 A1 offers a 3:2 aspect.

Olympus E-M1 II and Sony A1 sensor measures

With 49.8MP, the A1 offers a higher resolution than the E-M1 II (20.2MP), but the A1 nevertheless has larger individual pixels (pixel pitch of 4.16μm versus 3.34μm for the E-M1 II) due to its larger sensor. Moreover, the A1 is a much more recent model (by 4 years and 4 months) than the E-M1 II, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The resolution advantage of the Sony A1 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A1 for good quality output (200 dots per inch) amounts to 43.2 x 28.8 inches or 109.7 x 73.2 cm, for very good quality (250 dpi) 34.6 x 23 inches or 87.8 x 58.5 cm, and for excellent quality (300 dpi) 28.8 x 19.2 inches or 73.2 x 48.8 cm. The corresponding values for the Olympus E-M1 II 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.

Both cameras have the capacity to capture high quality composite images by combining multiple shots after shifting the 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 A1 are ISO 100 to ISO 32000, with the possibility to increase the ISO range to 500-102400.

E-M1 II versus A1 MP

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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"). The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

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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-M1 II Four Thirds 20.2 5184 38884K/30p23.712.8131280
2.
 
Sony A1 Full Frame 49.8 8640 57608k/30p........
3.
 
Olympus E-M1 III Four Thirds 20.2 5184 38884K/30p........
4.
 
Olympus PEN-F Four Thirds 20.2 5184 38881080/60p23.112.489474
5.
 
Olympus E-M5 II Four Thirds 15.9 4608 34561080/60p23.012.584273
6.
 
Olympus E-M1 Four Thirds 15.9 4608 34561080/30p23.012.775773
7.
 
Panasonic G9 Four Thirds 20.2 5184 38884K/60p........
8.
 
Panasonic GH5 Four Thirds 20.2 5184 38884K/60p23.913.080777
9.
 
Panasonic G85 Four Thirds 15.8 4592 34484K/30p22.812.565671
10.
 
Panasonic GX8 Four Thirds 20.2 5184 38884K/30p23.512.680675
11.
 
Sony A7S III Full Frame 12.0 4240 28324K/120p23.713.9252086
12.
 
Sony A7R IV Full Frame 60.2 9504 63364K/30p26.014.8334499
13.
 
Sony A7R III Full Frame 42.2 7952 53044K/30p26.014.73523100
14.
 
Sony A9 Full Frame 24.0 6000 40004K/30p24.913.3351792
15.
 
Sony A7R II Full Frame 42.2 7952 53044K/30p26.013.9343498
16.
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990

Many modern cameras are not only capable of taking still images, but can also record movies. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the A1 provides a better video resolution than the E-M1 II. It can shoot movie footage at 8k/30p, while the Olympus is limited to 4K/30p.

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Feature comparison

Apart from 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 A1 offers a substantially higher resolution than the one in the E-M1 II (9437k vs 2360k dots). The table below summarizes some of the other core capabilities of the Olympus E-M1 II and Sony A1 in connection with corresponding information for a sample of similar cameras.

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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-M1 II2360 n 3.0 1037 swivel Y 1/8000s 18.0 n Y
2.
 
Sony A19437 n 3.0 1440 tilting Y 1/8000s 10.0 n Y
3.
 
Olympus E-M1 III2360 n 3.0 1037 swivel Y 1/8000s 18.0 n Y
4.
 
Olympus PEN-F2360 n 3.0 1037 swivel Y 1/8000s 10.0 n Y
5.
 
Olympus E-M5 II2360 n 3.0 1037 swivel Y 1/8000s 10.0 n Y
6.
 
Olympus E-M12360 n 3.0 1037 tilting Y 1/8000s 10.0 n Y
7.
 
Panasonic G93680 Y 3.0 1040 swivel Y 1/8000s 20.0 n Y
8.
 
Panasonic GH53680 n 3.2 1620 swivel Y 1/8000s 12.0 n Y
9.
 
Panasonic G852360 n 3.0 1040 swivel Y 1/4000s 9.0 Y Y
10.
 
Panasonic GX82360 n 3.0 1040 swivel Y 1/8000s 10.0 n Y
11.
 
Sony A7S III9440 n 3.0 1440 swivel Y 1/8000s 10.0 n Y
12.
 
Sony A7R IV5760 n 3.0 1440 tilting Y 1/8000s 10.0 n Y
13.
 
Sony A7R III3686 n 3.0 1440 tilting Y 1/8000s 10.0 n Y
14.
 
Sony A93686 n 3.0 1440 tilting Y 1/8000s 20.0 n Y
15.
 
Sony A7R II2400 n 3.0 1229 tilting n 1/8000s 5.0 n Y
16.
 
Sony A7 II2400 n 3.0 1230 tilting n 1/8000s 5.0 n Y
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 A1 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 and the Sony A1 both have 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 A1 uses CFexpress or SDXC cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. Both cameras support UHS-II cards, which provide for Ultra High Speed data transfer of up to 312 MB/s (the second slot of the E-M1 II supports only UHS-I, though).

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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-M1 Mark II and Sony A1 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-M1 IIYstereomonoYYmicro3.0Y--
2.
 
Sony A1YstereomonoYYmini3.2Y-Y
3.
 
Olympus E-M1 IIIYstereomonoYYmicro3.1Y-Y
4.
 
Olympus PEN-FYstereomono--micro2.0Y--
5.
 
Olympus E-M5 IIYstereomonoY-micro2.0Y--
6.
 
Olympus E-M1YstereomonoY-micro2.0Y--
7.
 
Panasonic G9YstereomonoYYfull3.0Y-Y
8.
 
Panasonic GH5YstereomonoYYfull3.1Y-Y
9.
 
Panasonic G85YstereomonoY-micro2.0Y--
10.
 
Panasonic GX8YstereomonoY-micro2.0YY-
11.
 
Sony A7S IIIYstereomonoYYfull3.2Y-Y
12.
 
Sony A7R IVYstereomonoYYmicro3.1YYY
13.
 
Sony A7R IIIYstereomonoYYmicro3.1YYY
14.
 
Sony A9YstereomonoYYmicro2.0YYY
15.
 
Sony A7R IIYstereomonoYYmicro2.0YY-
16.
 
Sony A7 IIYstereomonoYYmicro2.0YY-

Both cameras feature a PC Sync terminal to control professional strobe lights, which will be appreciated by studio photographers.

Both the E-M1 II and the A1 are recent models that are part of the current product line-up. The E-M1 II replaced the earlier Olympus E-M1, while the A1 does not have a direct predecessor. 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 there a clear favorite between the Olympus E-M1 II and the Sony A1? Which camera is better? Below is a summary of the relative strengths of each of the two contestants.

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Reasons to prefer the Olympus OM-D E-M1 Mark II:

  • More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster burst: Shoots at higher frequency (18 vs 10 flaps/sec) to capture the decisive moment.
  • Less heavy: Is lighter (by 163g or 22 percent) and hence easier to carry around.
  • More affordable: Was introduced into a lower priced category (69 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in September 2016).

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Advantages of the Sony A1:

  • More detail: Has more megapixels (49.8 vs 20.2MP), which boosts linear resolution by 60%.
  • Better image quality: Is equipped with a larger and more technologically advanced sensor.
  • Richer colors: The sensor size advantage translates into images with better, more accurate colors.
  • More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
  • Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
  • Better video: Provides higher definition movie capture (8k/30p vs 4K/30p).
  • More detailed viewfinder: Has higher resolution electronic viewfinder (9437k vs 2360k dots).
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.9x vs 0.74x).
  • More detailed LCD: Has a higher resolution rear screen (1440k vs 1037k dots).
  • Longer lasting: Gets more shots (530 versus 440) out of a single battery charge.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • Easier wireless transfer: Supports Bluetooth for image sharing without cables.
  • More modern: Reflects 4 years and 4 months of technical progress since the E-M1 II launch.

If the count of relative strengths (bullet points above) is taken as a measure, the A1 is the clear winner of the contest (13 : 6 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision on a new camera. A professional wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

E-M1 II 06:13 A1

How about other alternatives? Do the specifications of the Olympus E-M1 II and the Sony A1 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 comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains incomplete and does no justice, for example, to the way the E-M1 II or the A1 perform in practice. 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-M1 II5/5+ +85/1004.5/54.5/5 Sep 2016 1,999 i
2.
 
Sony A15/5........ Jan 2021 6,499 i
3.
 
Olympus E-M1 III5/5..83/1004.5/54/5 Feb 2020 1,799 i
4.
 
Olympus PEN-F....82/1004.5/55/5 Jan 2016 1,199i
5.
 
Olympus E-M5 II5/5+ +81/1005/55/5 Feb 2015 1,099i
6.
 
Olympus E-M15/5+ +84/1004.5/54.5/5 Sep 2013 1,399i
7.
 
Panasonic G9..+ +85/1005/55/5 Nov 2017 1,699 i
8.
 
Panasonic GH54.5/5+ +85/1004.5/55/5 Jan 2017 1,999 i
9.
 
Panasonic G85..+ +84/1005/54.5/5 Sep 2016 899i
10.
 
Panasonic GX85/5+82/1004.5/54.5/5 Jul 2015 1,199i
11.
 
Sony A7S III..+ +91/1004.5/55/5 Jul 2020 3,499 i
12.
 
Sony A7R IV5/5+91/1004.5/55/5 Jul 2019 3,499 i
13.
 
Sony A7R III..+ +90/1004.5/55/5 Oct 2017 3,199i
14.
 
Sony A95/5+ +89/1005/55/5 Apr 2017 4,499i
15.
 
Sony A7R II5/5+ +90/1005/55/5 Jun 2015 3,199i
16.
 
Sony A7 II5/5+82/1004.5/55/5 Nov 2014 1,999i
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

Olympus E-M1 II:
Check Amazon price
Sony A1:
Check Amazon price

Other camera comparisons

Did this review help to inform your camera decision process? In case you are interested in seeing how other cameras pair up, 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.

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    Specifications: Olympus E-M1 II vs Sony A1

    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-M1 II Sony A1
    Camera Type Mirrorless system camera Mirrorless system camera
    Camera Lens Micro Four Thirds lenses Sony E mount lenses
    Launch Date September 2016 January 2021
    Launch Price USD 1,999 USD 6,499
    Sensor Specs Olympus E-M1 II Sony A1
    Sensor Technology CMOS BSI-CMOS
    Sensor Format Four Thirds Sensor Full Frame Sensor
    Sensor Size 17.3 x 13.0 mm 35.9 x 24.0 mm
    Sensor Area 224.9 mm2 861.6 mm2
    Sensor Diagonal 21.6 mm 43.2 mm
    Crop Factor 2.0x 1.0x
    Sensor Resolution 20.2 Megapixels 49.8 Megapixels
    Image Resolution 5184 x 3888 pixels 8640 x 5760 pixels
    Pixel Pitch 3.34 μm 4.16 μm
    Pixel Density 8.96 MP/cm2 5.78 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 4K/30p Video 8k/30p Video
    ISO Setting 200 - 25,600 ISO 100 - 32,000 ISO
    ISO Boost 64 - 25,600 ISO 500 - 102,400 ISO
    Image Processor TruePic VIII Dual BIONZ XR
    DXO Sensor Quality (score) 80 ..
    DXO Color Depth (bits) 23.7 ..
    DXO Dynamic Range (EV) 12.8 ..
    DXO Low Light (ISO) 1312 ..
    Screen Specs Olympus E-M1 II Sony A1
    Viewfinder Type Electronic viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.74x 0.9x
    Viewfinder Resolution 2360k dots 9437k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 1037k dots 1440k dots
    LCD Attachment Swivel screen Tilting screen
    Touch Input Touchscreen Touchscreen
    Shooting Specs Olympus E-M1 II Sony A1
    Focus System On-Sensor Phase-detect On-Sensor Phase-detect
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/8000s 1/8000s
    Continuous Shooting 18 shutter flaps/s 10 shutter flaps/s
    Shutter Life Expectancy200 000 actuations500 000 actuations
    Electronic Shutterup to 1/32000sup to 1/32000s
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDXC cards CFexpress or SDXC cards
    Second Storage Option Dual card slots Dual card slots
    UHS card support Single UHS-II UHS-II
    Connectivity Specs Olympus E-M1 II Sony A1
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket PC Sync socket
    USB Connector USB 3.0 USB 3.2
    HDMI Port micro HDMI mini HDMI
    Microphone Port External MIC port External MIC port
    Headphone Socket Headphone port Headphone port
    Wifi Support Wifi built-in Wifi built-in
    Bluetooth Support no Bluetooth Bluetooth built-in
    Body Specs Olympus E-M1 II Sony A1
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type BLH-1 NP-FZ100
    Battery Life (CIPA)440 shots per charge530 shots per charge
    In-Camera Charging no USB charging USB charging
    Body Dimensions 134 x 91 x 67 mm
    (5.3 x 3.6 x 2.6 in)
    129 x 97 x 81 mm
    (5.1 x 3.8 x 3.2 in)
    Camera Weight 574 g (20.2 oz) 737 g (26.0 oz)

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