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Olympus E-M1 vs E-PM1

The Olympus OM-D E-M1 and the Olympus PEN E-PM1 are two digital cameras that were officially introduced, respectively, in September 2013 and June 2011. Both the E-M1 and the E-PM1 are mirrorless interchangeable lens cameras that are equipped with a Four Thirds sensor. The E-M1 has a resolution of 15.9 megapixels, whereas the E-PM1 provides 12.2 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
versus
Olympus E-PM1
Olympus E-M1   Olympus E-PM1
Mirrorless system camera Mirrorless system camera
Micro Four Thirds lenses Micro Four Thirds lenses
15.9 MP – Four Thirds sensor 12.2 MP – Four Thirds sensor
1080/30p Video 1080/60i Video
ISO 200-25,600 ISO 100-12,800
Electronic viewfinder (2360k dots) Viewfinder optional
3.0" LCD – 1037k dots 3.0" LCD – 460k dots
Tilting touchscreen Fixed screen (not touch-sensitive)
10 shutter flaps per second 5.5 shutter flaps per second
In-body stabilizationIn-body stabilization
Weathersealed bodynot weather sealed
350 shots per battery charge330 shots per battery charge
130 x 94 x 63 mm, 497 g 110 x 64 x 34 mm, 265 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Olympus OM-D E-M1 and the Olympus PEN E-PM1? 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

The side-by-side display below illustrates the physical size and weight of the Olympus E-M1 and the Olympus E-PM1. 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 dimensions are rounded to the nearest millimeter.

The E-M1 can be obtained in two different colors (black, silver), while the E-PM1 is available in six color-versions (black, silver, brown, pink, purple, white).

Size Olympus E-M1 vs Olympus E-PM1
Compare E-M1 versus E-PM1 top
Comparison E-M1 or E-PM1 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-PM1 is considerably smaller (42 percent) than the Olympus E-M1. Moreover, the E-PM1 is substantially lighter (47 percent) than the E-M1. It is worth mentioning in this context that the E-M1 is splash and dust resistant, while the E-PM1 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. In this particular case, both cameras feature the same lens mount, so that they can use the same lenses. You can compare the optics available in the Micro Four Thirds Lens Catalog. 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 gets 350 shots out of its Olympus BLN-1 battery, while the E-PM1 can take 330 images on a single charge of its Olympus BLS-5 power pack.

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
# image 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 130 mm 94 mm 63 mm 497 g 350 Y Sep 2013 1,399ebay.com
2.
 
Olympus E-PM1 110 mm 64 mm 34 mm 265 g 330 n Jun 2011 499ebay.com
3.
 
Olympus E-M1 II 134 mm 91 mm 67 mm 574 g 440 Y Sep 2016 1,999ebay.com
4.
 
Olympus PEN-F 125 mm 72 mm 37 mm 427 g 330 n Jan 2016 1,199ebay.com
5.
 
Olympus E-M5 II 124 mm 85 mm 45 mm 469 g 310 Y Feb 2015 1,099ebay.com
6.
 
Olympus E-PL7 115 mm 67 mm 38 mm 357 g 350 n Aug 2014 599ebay.com
7.
 
Olympus E-P5 122 mm 69 mm 37 mm 420 g 330 n May 2013 999ebay.com
8.
 
Olympus E-M5 122 mm 89 mm 43 mm 425 g 360 Y Feb 2012 1,299ebay.com
9.
 
Olympus E-PL5 111 mm 64 mm 38 mm 325 g 360 n Sep 2012 599ebay.com
10.
 
Olympus E-PM2 110 mm 64 mm 34 mm 269 g 360 n Sep 2012 499ebay.com
11.
 
Olympus E-PL2 114 mm 72 mm 42 mm 362 g 280 n Jan 2011 599ebay.com
12.
 
Olympus E-PL3 110 mm 64 mm 37 mm 313 g 300 n Jun 2011 599ebay.com
13.
 
Olympus E-PL1 115 mm 72 mm 42 mm 334 g 290 n Feb 2010 599ebay.com
14.
 
Panasonic GH4 133 mm 93 mm 84 mm 560 g 500 Y Feb 2014 1,499ebay.com
15.
 
Panasonic GH3 133 mm 93 mm 82 mm 550 g 540 Y Sep 2012 1,299ebay.com
16.
 
Panasonic G2 124 mm 84 mm 74 mm 428 g 360 n Mar 2010 599ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
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Any camera decision will naturally be influenced heavily by the price. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The E-PM1 was launched at a markedly lower price (by 64 percent) than the E-M1, 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.

Sensor comparison

The size of the imaging sensor is a crucial determinant 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 tend to be more expensive and lead to bigger and heavier cameras and lenses.

Both cameras under consideration feature a Four Thirds sensor and have a format factor (sometimes also referred to as "crop factor") of 2.0. Within the spectrum of camera sensors, this places the review cameras among the medium-sized sensor cameras that aim to strike a balance between image quality and portability. Both cameras feature a native aspect ratio (sensor width to sensor height) of 4:3.

In terms of chip-set technology, the E-M1 uses a more advanced image processing engine (TruePIC VII) than the E-PM1 (TruePic VI), with benefits for noise reduction, color accuracy, and processing speed.

Olympus E-M1 and Olympus E-PM1 sensor measures

While the two cameras under review share the same sensor size, the E-M1 offers a higher resolution of 15.9 megapixels, compared with 12.2 MP of the E-PM1. This megapixels advantage translates into a 14 percent gain in linear resolution. On the other hand, these sensor specs imply that the E-M1 has a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.76μm versus 4.29μm for the E-PM1). In this context, it should be noted, however, that the E-M1 is much more recent (by 2 years and 2 months) than the E-PM1, and its sensor will have benefitted from technological advances during this time that compensate for the smaller pixel size. Coming back to sensor resolution, it should be mentioned that the E-M1 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 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the E-M1 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 Olympus E-PM1 are 20.2 x 15.1 inches or 51.2 x 38.4 cm for good quality, 16.1 x 12.1 inches or 41 x 30.7 cm for very good quality, and 13.4 x 10.1 inches or 34.1 x 25.6 cm for excellent quality prints.

The E-M1 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Olympus OM-D E-M1 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 Olympus PEN E-PM1 are ISO 100 to ISO 12800 (no boost).

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-M1 versus E-PM1 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). Of the two cameras under review, the E-M1 provides substantially higher image quality than the E-PM1, with an overall score that is 21 points higher. This advantage is based on 2 bits higher color depth, 2.4 EV in additional dynamic range, and 0.6 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.

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Sensor Characteristics
# image Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Olympus E-M1 Four Thirds 15.9 4608 34561080/30p23.012.775773
2.
 
Olympus E-PM1 Four Thirds 12.2 4032 30241080/60i21.010.349952
3.
 
Olympus E-M1 II Four Thirds 20.2 5184 38884K/30p23.712.8131280
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-PL7 Four Thirds 15.9 4608 34561080/30p22.712.487372
7.
 
Olympus E-P5 Four Thirds 15.9 4608 34561080/30p22.812.489572
8.
 
Olympus E-M5 Four Thirds 15.9 4608 34561080/60i22.812.382671
9.
 
Olympus E-PL5 Four Thirds 15.9 4608 34561080/30p22.812.388972
10.
 
Olympus E-PM2 Four Thirds 15.9 4608 34561080/30p22.712.293272
11.
 
Olympus E-PL2 Four Thirds 12.2 4032 3024720/30p21.410.257355
12.
 
Olympus E-PL3 Four Thirds 12.2 4032 30241080/60i20.910.349952
13.
 
Olympus E-PL1 Four Thirds 12.2 4032 3024720/30p21.510.148754
14.
 
Panasonic GH4 Four Thirds 15.9 4608 34564K/30p23.212.879174
15.
 
Panasonic GH3 Four Thirds 15.9 4608 34561080/60p22.712.481271
16.
 
Panasonic G2 Four Thirds 12.0 4000 3000720/30p21.210.349353
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Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the E-PM1 provides a faster frame rate than the E-M1. It can shoot movie footage at 1080/60i, while the E-M1 is limited to 1080/30p.

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Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the E-M1 has an electronic viewfinder (2360k dots), which can be very helpful when shooting in bright sunlight. In contrast, the E-PM1 relies on live view and the rear LCD for framing. That said, the E-PM1 can be equipped with an optional viewfinder – the VF-2. The following table reports on some other key feature differences and similarities of the Olympus E-M1, the Olympus E-PM1, and comparable cameras.

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Core Features
# image 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-M12360 n3.0 / 1037 tilting Y 1/8000s 10.0/s n Y
2.
 
Olympus E-PM1optional n3.0 / 460 fixed n 1/4000s 5.5/s n Y
3.
 
Olympus E-M1 II2360 n3.0 / 1037 swivel Y 1/8000s 18.0/s n Y
4.
 
Olympus PEN-F2360 n3.0 / 1037 swivel Y 1/8000s 10.0/s n Y
5.
 
Olympus E-M5 II2360 n3.0 / 1037 swivel Y 1/8000s 10.0/s n Y
6.
 
Olympus E-PL7optional n3.0 / 1037 tilting Y 1/4000s 8.0/s n Y
7.
 
Olympus E-P5optional n3.0 / 1037 tilting Y 1/8000s 9.0/s Y Y
8.
 
Olympus E-M51440 n3.0 / 610 tilting Y 1/4000s 9.0/s n Y
9.
 
Olympus E-PL5optional n3.0 / 460 tilting Y 1/4000s 8.0/s n Y
10.
 
Olympus E-PM2optional n3.0 / 460 fixed Y 1/4000s 8.0/s n Y
11.
 
Olympus E-PL2optional n3.0 / 460 fixed n 1/4000s 3.0/s Y Y
12.
 
Olympus E-PL3optional n3.0 / 460 tilting n 1/4000s 5.5/s n Y
13.
 
Olympus E-PL1optional n2.7 / 230 fixed n 1/2000s 3.0/s Y Y
14.
 
Panasonic GH42359 n3.0 / 1036 swivel Y 1/8000s 12.0/s Y n
15.
 
Panasonic GH31746 n3.0 / 614 swivel Y 1/4000s 6.0/s Y n
16.
 
Panasonic G21440 n3.0 / 460 swivel Y 1/4000s 2.6/s Y n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
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One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The E-M1 has a touchscreen, while the E-PM1 has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.

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-M1 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-M1 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.

Concerning the storage of imaging data, both the E-M1 and the E-PM1 write their files to SDXC cards. The E-M1 supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the E-PM1 cannot take advantage of Ultra High Speed SD cards.

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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 and Olympus PEN E-PM1 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
# image Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Olympus E-M1Ystereo / monoY-micro2.0Y--
2.
 
Olympus E-PM1Ystereo / mono--mini2.0---
3.
 
Olympus E-M1 IIYstereo / monoYYmicro3.0Y--
4.
 
Olympus PEN-FYstereo / mono--micro2.0Y--
5.
 
Olympus E-M5 IIYstereo / monoY-micro2.0Y--
6.
 
Olympus E-PL7Ystereo / mono--micro2.0Y--
7.
 
Olympus E-P5Ystereo / mono--micro2.0Y--
8.
 
Olympus E-M5Ystereo / mono--mini2.0---
9.
 
Olympus E-PL5Ystereo / mono--mini2.0---
10.
 
Olympus E-PM2Ystereo / mono--mini2.0---
11.
 
Olympus E-PL2Ystereo / ---mini2.0---
12.
 
Olympus E-PL3Ystereo / ---mini2.0---
13.
 
Olympus E-PL1Ystereo / ---mini2.0---
14.
 
Panasonic GH4Ystereo / monoYYmicro2.0YY-
15.
 
Panasonic GH3Ystereo / monoYYmini2.0Y--
16.
 
Panasonic G2Ystereo / mono--mini2.0---
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It is notable that the E-M1 has a microphone port, which is missing on the E-PM1. Such an external microphone input can help to substantially improve the quality of audio recordings when a good external microphone is used.

Studio photographers will appreciate that the Olympus E-M1 (unlike the E-PM1) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the E-M1 and the E-PM1 have been discontinued, but can regularly be found used on ebay. The E-PM1 was replaced by the Olympus E-PM2, while the E-M1 was followed by the Olympus E-M1 II. Further information on the features and operation of the E-M1 and E-PM1 can be found, respectively, in the Olympus E-M1 Manual (free pdf) or the online Olympus E-PM1 Manual.

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Review summary

So what conclusions can be drawn? Which of the two cameras – the Olympus E-M1 or the Olympus E-PM1 – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.


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

  • More detail: Offers more megapixels (15.9 vs 12.2MP) with a 14% higher linear resolution.
  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Better image quality: Scores substantially higher (21 points) in the DXO overall assessment.
  • Richer colors: Generates images with noticeably better colors (2 bits more color depth).
  • More dynamic range: Captures a larger spectrum of light and dark details (2.4 EV of extra DR).
  • Better low-light sensitivity: Requires less light for good images (0.6 stops ISO advantage).
  • Better jpgs: Has a more modern image processing engine (TruePIC VII vs TruePic VI).
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Easier framing: Has an electronic viewfinder for image composition and settings control.
  • More detailed LCD: Has a higher resolution rear screen (1037k vs 460k dots).
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (10 vs 5.5 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.
  • Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
  • More modern: Reflects 2 years and 2 months of technical progress since the E-PM1 launch.


Arguments in favor of the Olympus PEN E-PM1:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Better video: Provides higher movie framerates (1080/60i versus 1080/30p).
  • More compact: Is smaller (110x64mm vs 130x94mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 232g or 47 percent) and is thus easier to take along.
  • More affordable: Was introduced into a lower priced category (64 percent cheaper at launch).
  • More heavily discounted: Has been around for much longer (launched in June 2011).

If the number of relative strengths (bullet points above) is taken as a guide, the E-M1 is the clear winner of the match-up (22 : 6 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 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 22:06 E-PM1

How about other alternatives? Do the specifications of the Olympus E-M1 and the Olympus E-PM1 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 partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the E-M1 or the E-PM1. 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.

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
# image  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Olympus E-M15/5+ +..84/1004.5/54.5/5 Sep 2013 1,399ebay.com
2.
 
Olympus E-PM1..86/100..71/1004.5/54.5/5 Jun 2011 499ebay.com
3.
 
Olympus E-M1 II5/5+ +5/585/1004.5/54.5/5 Sep 2016 1,999ebay.com
4.
 
Olympus PEN-F....4/582/1004.5/55/5 Jan 2016 1,199ebay.com
5.
 
Olympus E-M5 II5/5+ +4.5/581/1005/55/5 Feb 2015 1,099ebay.com
6.
 
Olympus E-PL74/5+....5/54/5 Aug 2014 599ebay.com
7.
 
Olympus E-P55/5+ +..78/1004.5/55/5 May 2013 999ebay.com
8.
 
Olympus E-M54/5+ +..80/1004.5/55/5 Feb 2012 1,299ebay.com
9.
 
Olympus E-PL53/5+ +....4.5/54.5/5 Sep 2012 599ebay.com
10.
 
Olympus E-PM23/5....77/1005/54.5/5 Sep 2012 499ebay.com
11.
 
Olympus E-PL23/583/100..71/1004.5/54.5/5 Jan 2011 599ebay.com
12.
 
Olympus E-PL33/5+ +..72/1004.5/54/5 Jun 2011 599ebay.com
13.
 
Olympus E-PL1..86/100..69/1004/54.5/5 Feb 2010 599ebay.com
14.
 
Panasonic GH45/5+ +..85/1005/55/5 Feb 2014 1,499ebay.com
15.
 
Panasonic GH35/5+ +..79/1004.5/54.5/5 Sep 2012 1,299ebay.com
16.
 
Panasonic G2......72/1004/54.5/5 Mar 2010 599ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
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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. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

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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 a corresponding selection in the search boxes below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Olympus E-M1 vs Olympus E-PM1

    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 Olympus E-PM1
    Camera Type Mirrorless system camera Mirrorless system camera
    Camera Lens Micro Four Thirds lenses Micro Four Thirds lenses
    Launch Date September 2013 June 2011
    Launch Price USD 1,399 USD 499
    Sensor Specs Olympus E-M1 Olympus E-PM1
    Sensor Technology CMOS CMOS
    Sensor Format Four Thirds Sensor Four Thirds Sensor
    Sensor Size 17.3 x 13.0 mm 17.3 x 13.0 mm
    Sensor Area 224.9 mm2 224.9 mm2
    Sensor Diagonal 21.6 mm 21.6 mm
    Crop Factor 2.0x 2.0x
    Sensor Resolution 15.9 Megapixels 12.2 Megapixels
    Image Resolution 4608 x 3456 pixels 4032 x 3024 pixels
    Pixel Pitch 3.76 μm 4.29 μm
    Pixel Density 7.08 MP/cm2 5.42 MP/cm2
    Moiré control no AA filter Anti-Alias filter
    Movie Capability 1080/30p Video 1080/60i Video
    ISO Setting 200 - 25,600 ISO 100 - 12,800 ISO
    ISO Boost 100 - 25,600 ISO no Enhancement
    Image Processor TruePIC VII TruePic VI
    DXO Sensor Quality (score) 73 52
    DXO Color Depth (bits) 23.0 21.0
    DXO Dynamic Range (EV) 12.7 10.3
    DXO Low Light (ISO) 757 499
    Screen Specs Olympus E-M1 Olympus E-PM1
    Viewfinder Type Electronic viewfinder Viewfinder optional
    Viewfinder Field of View 100%
    Viewfinder Magnification 0.74x
    Viewfinder Resolution 2360k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 1037k dots 460k dots
    LCD Attachment Tilting screen Fixed screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Olympus E-M1 Olympus E-PM1
    Focus System On-Sensor Phase-detect Contrast-detect AF
    Manual Focusing AidFocus Peakingno Peaking Feature
    Continuous Shooting 10 shutter flaps/s 5.5 shutter flaps/s
    Electronic ShutterYESno E-Shutter
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDXC cards SDXC cards
    Single or Dual Card Slots Single card slot Single card slot
    UHS card support UHS-I no
    Connectivity Specs Olympus E-M1 Olympus E-PM1
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    USB Connector USB 2.0 USB 2.0
    HDMI Port micro HDMI mini HDMI
    Microphone Port External MIC port no MIC socket
    Wifi Support Wifi built-in no Wifi
    Body Specs Olympus E-M1 Olympus E-PM1
    Environmental SealingWeathersealed bodynot weather sealed
    Battery Type Olympus BLN-1 Olympus BLS-5
    Battery Life (CIPA)350 shots per charge330 shots per charge
    Body Dimensions 130 x 94 x 63 mm
    (5.1 x 3.7 x 2.5 in)
    110 x 64 x 34 mm
    (4.3 x 2.5 x 1.3 in)
    Camera Weight 497 g (17.5 oz) 265 g (9.3 oz)
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    Check E-PM1 offers at
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