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Olympus E-PM2 vs Pentax 645Z

The Olympus PEN E-PM2 and the Pentax 645Z are two digital cameras that were officially introduced, respectively, in September 2012 and April 2014. The E-PM2 is a mirrorless interchangeable lens camera, while the 645Z is a DSLR. The cameras are based on a Four Thirds (E-PM2) and a medium format (645Z) sensor. The Olympus has a resolution of 15.9 megapixels, whereas the Pentax provides 51.1 MP.

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

Headline Specifications
Olympus E-PM2
versus
Pentax 645Z
Olympus E-PM2   Pentax 645Z
Mirrorless system camera Digital single lens reflex
Micro Four Thirds lenses Pentax 645 mount lenses
15.9 MP – Four Thirds sensor 51.1 MP – Medium Format sensor
1080/30p Video 1080/60i Video
ISO 100-25,600 ISO 100-204,800
Viewfinder optional Optical viewfinder
3.0" LCD – 460k dots 3.2" LCD – 1037k dots
Fixed touchscreen Tilting screen (no touchscreen)
8 shutter flaps per second 3 shutter flaps per second
In-body stabilizationLens stabilization only
not weather sealedWeathersealed body
360 shots per battery charge650 shots per battery charge
110 x 64 x 34 mm, 269 g 156 x 117 x 123 mm, 1550 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Olympus PEN E-PM2 and the Pentax 645Z? 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 physical size and weight of the Olympus E-PM2 and the Pentax 645Z 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-PM2 can be obtained in four different colors (black, silver, red, white), while the 645Z is only available in black.

Size Olympus E-PM2 vs Pentax 645Z
Compare E-PM2 versus 645Z top
Comparison E-PM2 or 645Z rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax 645Z is considerably larger (159 percent) than the Olympus E-PM2. Moreover, the 645Z is substantially heavier (476 percent) than the E-PM2. It is noteworthy in this context that the 645Z is splash and dust-proof, while the E-PM2 does not feature any corresponding weather-sealing.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the E-PM2 gets 360 shots out of its Olympus BLS-5 battery, while the 645Z can take 650 images on a single charge of its Pentax D-LI90 power pack.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. 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
# 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-PM2 110 mm 64 mm 34 mm 269 g 360 n Sep 2012 499ebay.com
2.
 
Pentax 645Z 156 mm 117 mm 123 mm 1550 g 650 Y Apr 2014 8,499ebay.com
3.
 
Canon 5DS 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699ebay.com
4.
 
Canon 5DS R 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699ebay.com
5.
 
Hasselblad X1D 150 mm 98 mm 71 mm 725 g .. Y Jun 2016 8,995ebay.com
6.
 
Leica SL 147 mm 104 mm 39 mm 847 g 400 Y Oct 2015 7,450ebay.com
7.
 
Olympus E-PL9 117 mm 68 mm 39 mm 380 g 350 n Feb 2018 599ebay.com
8.
 
Olympus E-PL8 115 mm 67 mm 38 mm 357 g 350 n Sep 2016 549ebay.com
9.
 
Olympus E-M10 II 120 mm 83 mm 47 mm 390 g 320 n Aug 2015 649ebay.com
10.
 
Olympus E-PL7 115 mm 67 mm 38 mm 357 g 350 n Aug 2014 599ebay.com
11.
 
Olympus E-P5 122 mm 69 mm 37 mm 420 g 330 n May 2013 999ebay.com
12.
 
Olympus E-PL6 111 mm 64 mm 38 mm 325 g 360 n May 2013 599ebay.com
13.
 
Olympus E-PL5 111 mm 64 mm 38 mm 325 g 360 n Sep 2012 599ebay.com
14.
 
Olympus E-PL3 110 mm 64 mm 37 mm 313 g 300 n Jun 2011 599ebay.com
15.
 
Olympus E-PM1 110 mm 64 mm 34 mm 265 g 330 n Jun 2011 499ebay.com
16.
 
Panasonic GX850 107 mm 65 mm 33 mm 269 g 210 n Jan 2017 549ebay.com
17.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 9,995ebay.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 manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The E-PM2 was launched at a markedly lower price (by 94 percent) than the 645Z, 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 sensor inside a digital camera is one of the key determinants 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-PM2 features a Four Thirds sensor and the Pentax 645Z a medium format sensor. The sensor area in the 645Z is 539 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.0 and 0.79. Both cameras feature a native aspect ratio (sensor width to sensor height) of 4:3.

Olympus E-PM2 and Pentax 645Z sensor measures

With 51.1MP, the 645Z offers a higher resolution than the E-PM2 (15.9MP), but the 645Z nevertheless has larger individual pixels (pixel pitch of 5.30μm versus 3.76μm for the E-PM2) due to its larger sensor. Moreover, the 645Z is a somewhat more recent model (by 1 year and 6 months) than the E-PM2, and its sensor might 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 the 645Z has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Pentax 645Z implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 645Z for good quality output (200 dots per inch) amounts to 41.3 x 31 inches or 104.9 x 78.6 cm, for very good quality (250 dpi) 33 x 24.8 inches or 83.9 x 62.9 cm, and for excellent quality (300 dpi) 27.5 x 20.6 inches or 69.9 x 52.4 cm. The corresponding values for the Olympus E-PM2 are 23 x 17.3 inches or 58.5 x 43.9 cm for good quality, 18.4 x 13.8 inches or 46.8 x 35.1 cm for very good quality, and 15.4 x 11.5 inches or 39 x 29.3 cm for excellent quality prints.

The Olympus PEN E-PM2 has a native sensitivity range from ISO 100 to ISO 25600. The corresponding ISO settings for the Pentax 645Z are ISO 100 to ISO 204800 (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-PM2 versus 645Z MP

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. Of the two cameras under consideration, the 645Z offers substantially better image quality than the E-PM2 (overall score 29 points higher). The advantage is based on 3.3 bits higher color depth, 2.5 EV in additional dynamic range, and 2.3 stops in additional low light sensitivity. 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
# image Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Olympus E-PM2 Four Thirds 15.9 4608 34561080/30p22.712.293272
2.
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
3.
 
Canon 5DS Full Frame 50.3 8688 57921080/30p24.712.4238187
4.
 
Canon 5DS R Full Frame 50.3 8688 57921080/30p24.612.4230886
5.
 
Hasselblad X1D Medium Format 51.3 8272 62001080/25p26.214.84489102
6.
 
Leica SL Full Frame 24.0 6000 40004K/30p25.013.4182188
7.
 
Olympus E-PL9 Four Thirds 15.9 4608 34564K/30p23.112.8116274
8.
 
Olympus E-PL8 Four Thirds 15.9 4608 34561080/30p23.012.6103073
9.
 
Olympus E-M10 II Four Thirds 15.9 4608 34561080/60p23.112.584273
10.
 
Olympus E-PL7 Four Thirds 15.9 4608 34561080/30p22.712.487372
11.
 
Olympus E-P5 Four Thirds 15.9 4608 34561080/30p22.812.489572
12.
 
Olympus E-PL6 Four Thirds 15.9 4608 34561080/30p22.512.071768
13.
 
Olympus E-PL5 Four Thirds 15.9 4608 34561080/30p22.812.388972
14.
 
Olympus E-PL3 Four Thirds 12.2 4032 30241080/60i20.910.349952
15.
 
Olympus E-PM1 Four Thirds 12.2 4032 30241080/60i21.010.349952
16.
 
Panasonic GX850 Four Thirds 15.8 4592 34484K/30p23.213.358673
17.
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.6126282
Note: DXO values in italics represent estimates based on sensor size and age.
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Many modern cameras are not only capable of taking still images, but also of capturing video footage. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the 645Z provides a faster frame rate than the E-PM2. It can shoot movie footage at 1080/60i, while the Olympus is limited to 1080/30p.

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Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the 645Z has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the E-PM2 relies on live view and the rear LCD for framing. That said, the E-PM2 can be equipped with an optional viewfinder – the VF-4. The table below summarizes some of the other core capabilities of the Olympus E-PM2 and Pentax 645Z in connection with corresponding information for a sample of similar 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-PM2optional n3.0 / 460 fixed Y 1/4000s 8.0/s n Y
2.
 
Pentax 645Zoptical Y3.2 / 1037 tilting n 1/4000s 3.0/s n n
3.
 
Canon 5DSoptical Y3.2 / 1040 fixed n 1/8000s 5.0/s n n
4.
 
Canon 5DS Roptical Y3.2 / 1040 fixed n 1/8000s 5.0/s n n
5.
 
Hasselblad X1D2360 n3.0 / 920 fixed Y 1/2000s 2.3/s n n
6.
 
Leica SL4400 Y3.0 / 1040 fixed Y 1/8000s 11.0/s n n
7.
 
Olympus E-PL9none n3.0 / 1040 tilting Y 1/4000s 8.6/s Y Y
8.
 
Olympus E-PL8optional n3.0 / 1037 tilting Y 1/4000s 8.0/s n Y
9.
 
Olympus E-M10 II2360 n3.0 / 1040 tilting Y 1/4000s 8.0/s Y Y
10.
 
Olympus E-PL7optional n3.0 / 1037 tilting Y 1/4000s 8.0/s n Y
11.
 
Olympus E-P5optional n3.0 / 1037 tilting Y 1/8000s 9.0/s Y Y
12.
 
Olympus E-PL6optional n3.0 / 460 tilting Y 1/4000s 8.0/s n Y
13.
 
Olympus E-PL5optional n3.0 / 460 tilting Y 1/4000s 8.0/s n Y
14.
 
Olympus E-PL3optional n3.0 / 460 tilting n 1/4000s 5.5/s n Y
15.
 
Olympus E-PM1optional n3.0 / 460 fixed n 1/4000s 5.5/s n Y
16.
 
Panasonic GX850none n3.0 / 1040 tilting Y 1/500s 10.0/s Y n
17.
 
Pentax 645Doptical Y3.0 / 921 fixed n 1/4000s 1.1/s n n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
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One feature that differentiates the E-PM2 and the 645Z is in-body image stabilization (IBIS). The E-PM2 reduces the risk of handshake-induced blur with all attached lenses, while the 645Z offers no blur reduction with lenses that themselves do not provide optical image stabilization.

The Pentax 645Z 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-PM2 and the 645Z write their files to SDXC cards. The 645Z features dual card slots, which can be very useful in case a memory card fails. In contrast, the E-PM2 only has one slot. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

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Connectivity comparison

For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Olympus PEN E-PM2 and Pentax 645Z 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-PM2Ystereo / mono--mini2.0---
2.
 
Pentax 645ZYstereo / monoY-mini3.0---
3.
 
Canon 5DSYmono / monoY-mini3.0---
4.
 
Canon 5DS RYmono / monoY-mini3.0---
5.
 
Hasselblad X1DYstereo / monoYYmini3.0Y--
6.
 
Leica SLYstereo / monoYYfull3.0Y--
7.
 
Olympus E-PL9Ystereo / mono--micro2.0Y-Y
8.
 
Olympus E-PL8Ystereo / mono--micro2.0Y--
9.
 
Olympus E-M10 IIYstereo / mono--micro2.0Y--
10.
 
Olympus E-PL7Ystereo / mono--micro2.0Y--
11.
 
Olympus E-P5Ystereo / mono--micro2.0Y--
12.
 
Olympus E-PL6Ystereo / mono--mini2.0---
13.
 
Olympus E-PL5Ystereo / mono--mini2.0---
14.
 
Olympus E-PL3Ystereo / ---mini2.0---
15.
 
Olympus E-PM1Ystereo / mono--mini2.0---
16.
 
Panasonic GX850-stereo / mono--micro2.0Y--
17.
 
Pentax 645DYstereo / ----2.0---
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It is notable that the 645Z has a microphone port, which can help to improve the quality of audio recordings by attaching an external microphone. The E-PM2 does not feature such a mic input.

Studio photographers will appreciate that the Pentax 645Z (unlike the E-PM2) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the E-PM2 and the 645Z have been discontinued, but can regularly be found used on ebay. Neither of the two has a direct successor, so they represent the end of the respective camera lines from Olympus and Pentax. Further information on the features and operation of the E-PM2 and 645Z can be found, respectively, in the Olympus E-PM2 Manual (free pdf) or the online Pentax 645Z Manual.

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Review summary

So how do things add up? Is there a clear favorite between the Olympus E-PM2 and the Pentax 645Z? Which camera is better? A synthesis of the relative strong points of each of the models is listed below.

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Advantages of the Olympus PEN E-PM2:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • Faster burst: Shoots at higher frequency (8 vs 3 flaps/sec) to capture the decisive moment.
  • More compact: Is smaller (110x64mm vs 156x117mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 1281g or 83 percent) and hence easier to carry around.
  • Sharper images: Has hand-shake reducing image stabilization built-in.
  • More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
  • More affordable: Was introduced into a lower priced category (94 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in September 2012).

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Reasons to prefer the Pentax 645Z:

  • More detail: Has more megapixels (51.1 vs 15.9MP), which boosts linear resolution by 79%.
  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Better image quality: Scores substantially higher (29 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (3.3 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (2.5 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (2.3 stops ISO advantage).
  • Better video: Provides higher movie framerates (1080/60i versus 1080/30p).
  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Easier framing: Has an optical viewfinder for image composition and settings control.
  • Easier setting verification: Features a control panel on top to check shooting parameters.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review 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.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Longer lasting: Gets more shots (650 versus 360) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • 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.
  • More modern: Was introduced somewhat (1 year and 6 months) more recently.

If the count of relative strengths (bullet points above) is taken as a measure, the 645Z is the clear winner of the contest (20 : 9 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-PM2 09:20 645Z

How about other alternatives? Do the specifications of the Olympus E-PM2 and the Pentax 645Z place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best DSLR Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it says little about, for example, the shooting experience and imaging performance of the E-PM2 and the 645Z in practical situations. 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 where reviews by experts come in. The following table reports the overall ratings of the cameras as published by some of the major camera 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-PM23/5....77/1005/54.5/5 Sep 2012 499ebay.com
2.
 
Pentax 645Z5/5..3.5/5..4.5/55/5 Apr 2014 8,499ebay.com
3.
 
Canon 5DS..+..83/1004.5/54.5/5 Feb 2015 3,699ebay.com
4.
 
Canon 5DS R5/5+..83/1005/54.5/5 Feb 2015 3,699ebay.com
5.
 
Hasselblad X1D..o..81/100..4/5 Jun 2016 8,995ebay.com
6.
 
Leica SL4/5..4/584/1004.5/54/5 Oct 2015 7,450ebay.com
7.
 
Olympus E-PL9..+....4.5/54/5 Feb 2018 599ebay.com
8.
 
Olympus E-PL8........4.5/54/5 Sep 2016 549ebay.com
9.
 
Olympus E-M10 II4.5/5+ +..80/1005/55/5 Aug 2015 649ebay.com
10.
 
Olympus E-PL74/5+....5/54/5 Aug 2014 599ebay.com
11.
 
Olympus E-P55/5+ +..78/1004.5/55/5 May 2013 999ebay.com
12.
 
Olympus E-PL6............ May 2013 599ebay.com
13.
 
Olympus E-PL53/5+ +....4.5/54.5/5 Sep 2012 599ebay.com
14.
 
Olympus E-PL33/5+ +..72/1004.5/54/5 Jun 2011 599ebay.com
15.
 
Olympus E-PM1..86/100..71/1004.5/54.5/5 Jun 2011 499ebay.com
16.
 
Panasonic GX850..+..76/1004.5/54.5/5 Jan 2017 549ebay.com
17.
 
Pentax 645D5/5.......... Mar 2010 9,995ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
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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 comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

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Other camera comparisons

Did this review help to inform your camera decision process? 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. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

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    Specifications: Olympus E-PM2 vs Pentax 645Z

    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-PM2 Pentax 645Z
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Micro Four Thirds lenses Pentax 645 mount lenses
    Launch Date September 2012 April 2014
    Launch Price USD 499 USD 8,499
    Sensor Specs Olympus E-PM2 Pentax 645Z
    Sensor Technology CMOS CMOS
    Sensor Format Four Thirds Sensor Medium Format Sensor
    Sensor Size 17.3 x 13.0 mm 43.8 x 32.8 mm
    Sensor Area 224.9 mm2 1436.64 mm2
    Sensor Diagonal 21.6 mm 54.7 mm
    Crop Factor 2.0x 0.79x
    Sensor Resolution 15.9 Megapixels 51.1 Megapixels
    Image Resolution 4608 x 3456 pixels 8256 x 6192 pixels
    Pixel Pitch 3.76 μm 5.30 μm
    Pixel Density 7.08 MP/cm2 3.56 MP/cm2
    Moiré control Anti-Alias filter no AA filter
    Movie Capability 1080/30p Video 1080/60i Video
    ISO Setting 100 - 25,600 ISO 100 - 204,800 ISO
    Image Processor TruePic VI PRIME III
    DXO Sensor Quality (score) 72 101
    DXO Color Depth (bits) 22.7 26.0
    DXO Dynamic Range (EV) 12.2 14.7
    DXO Low Light (ISO) 932 4505
    Screen Specs Olympus E-PM2 Pentax 645Z
    Viewfinder Type Viewfinder optional Optical viewfinder
    Viewfinder Field of View 98%
    Viewfinder Magnification 0.78x
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.2inch
    LCD Resolution 460k dots 1037k dots
    LCD Attachment Fixed screen Tilting screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Olympus E-PM2 Pentax 645Z
    Focus System Contrast-detect AF Phase-detect AF
    Manual Focusing Aidno Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/4000s
    Continuous Shooting 8 shutter flaps/s 3 shutter flaps/s
    Time-Lapse Photographyno IntervalometerIntervalometer built-in
    Image StabilizationIn-body stabilizationLens stabilization only
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDXC cards SDXC cards
    Single or Dual Card Slots Single card slot Dual card slots
    UHS card support UHS-I UHS-I
    Connectivity Specs Olympus E-PM2 Pentax 645Z
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 3.0
    HDMI Port mini HDMI mini HDMI
    Microphone Port no MIC socket External MIC port
    Wifi Support no Wifi no Wifi
    Body Specs Olympus E-PM2 Pentax 645Z
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type Olympus BLS-5 Pentax D-LI90
    Battery Life (CIPA)360 shots per charge650 shots per charge
    Body Dimensions 110 x 64 x 34 mm
    (4.3 x 2.5 x 1.3 in)
    156 x 117 x 123 mm
    (6.1 x 4.6 x 4.8 in)
    Camera Weight 269 g (9.5 oz) 1550 g (54.7 oz)
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