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Nikon D7100 vs Olympus E-M10 II

The Nikon D7100 and the Olympus OM-D E-M10 Mark II are two digital cameras that were revealed to the public, respectively, in February 2013 and August 2015. The D7100 is a DSLR, while the E-M10 II is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (D7100) and a Four Thirds (E-M10 II) sensor. The Nikon has a resolution of 24 megapixels, whereas the Olympus provides 15.9 MP.

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

Headline Specifications
Nikon D7100
versus
Olympus E-M10 II
Nikon D7100   Olympus E-M10 II
Digital single lens reflex Mirrorless system camera
Nikon F mount lenses Micro Four Thirds lenses
24 MP – APS-C sensor 15.9 MP – Four Thirds sensor
1080/60p Video 1080/60p Video
ISO 100-6,400 (50 - 25,600) ISO 200-25,600
Optical viewfinder Electronic viewfinder (2360k dots)
3.2" LCD – 1229k dots 3.2" LCD – 1040k dots
Fixed screen (not touch-sensitive) Tilting touchscreen
6 shutter flaps per second 8 shutter flaps per second
Lens stabilization onlyIn-body stabilization
Weathersealed bodynot weather sealed
950 shots per battery charge320 shots per battery charge
136 x 107 x 76 mm, 765 g 120 x 83 x 47 mm, 390 g
Nikon D7100:
Check Ebay offers
Olympus E-M10 II:
Check Ebay offers

Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D7100 and the Olympus OM-D E-M10 Mark II? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.

Body comparison

The side-by-side display below illustrates the physical size and weight of the Nikon D7100 and the Olympus E-M10 II. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All size dimensions are rounded to the nearest millimeter.

The E-M10 II can be obtained in three different colors (black, silver, brown), while the D7100 is only available in black.

Size Nikon D7100 vs Olympus E-M10 II
Compare D7100 versus E-M10 II top
Comparison D7100 or E-M10 II rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-M10 II is considerably smaller (32 percent) than the Nikon D7100. Moreover, the E-M10 II is substantially lighter (49 percent) than the D7100. It is worth mentioning in this context that the D7100 is splash and dust resistant, while the E-M10 II 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. 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 Nikon Lens Catalog (D7100) and the Micro Four Thirds Lens Catalog (E-M10 II). Mirrorless cameras, such as the E-M10 II, have moreover the advantage that they can use many lenses from other systems via adapters, as they have a relatively short flange to focal plane distance.

Concerning battery life, the D7100 gets 950 shots out of its EN-EL15 battery, while the E-M10 II can take 320 images on a single charge of its BLS-50 power pack.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. 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.
 
Nikon D7100 136 mm 107 mm 76 mm 765 g 950 Y Feb 2013 1,199i
2.
 
Olympus E-M10 II 120 mm 83 mm 47 mm 390 g 320 n Aug 2015 649i
3.
 
Canon 80D 139 mm 105 mm 79 mm 730 g 960 Y Feb 2016 1,199i
4.
 
Canon 70D 139 mm 104 mm 79 mm 755 g 920 Y Jul 2013 1,199i
5.
 
Nikon D7500 136 mm 104 mm 73 mm 720 g 950 Y Apr 2017 1,299 i
6.
 
Nikon D500 147 mm 115 mm 81 mm 860 g 1240 Y Jan 2016 1,999 i
7.
 
Nikon D7200 136 mm 107 mm 76 mm 765 g 1110 Y Mar 2015 1,199i
8.
 
Nikon D750 141 mm 113 mm 78 mm 750 g 1230 Y Sep 2014 2,299i
9.
 
Nikon D610 141 mm 113 mm 82 mm 850 g 900 Y Oct 2013 1,999 i
10.
 
Nikon D600 141 mm 113 mm 82 mm 850 g 900 Y Sep 2012 2,099i
11.
 
Nikon D7000 132 mm 105 mm 77 mm 780 g 1050 Y Sep 2010 1,499i
12.
 
Olympus E-M10 III 122 mm 84 mm 50 mm 410 g 330 n Aug 2017 649i
13.
 
Olympus E-M5 II 124 mm 85 mm 45 mm 469 g 310 Y Feb 2015 1,099i
14.
 
Olympus E-M10 119 mm 82 mm 46 mm 396 g 320 n Jan 2014 699i
15.
 
Olympus E-PL7 115 mm 67 mm 38 mm 357 g 350 n Aug 2014 599i
16.
 
Panasonic GX80 122 mm 71 mm 44 mm 426 g 290 n Apr 2016 799 i
17.
 
Sony RX10 129 mm 88 mm 102 mm 813 g 420 Y Oct 2013 1,299i
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

Any camera decision will naturally be influenced heavily by the price. 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-M10 II was launched at a markedly lower price (by 46 percent) than the D7100, which puts it into a different market segment. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

Sensor comparison

The size of the sensor inside a digital camera is one of the key determinants 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 tend to be associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Nikon D7100 features an APS-C sensor and the Olympus E-M10 II a Four Thirds sensor. The sensor area in the E-M10 II is 39 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 2.0. The sensor in the D7100 has a native 3:2 aspect ratio, while the one in the E-M10 II offers a 4:3 aspect.

Nikon D7100 and Olympus E-M10 II sensor measures

With 24MP, the D7100 offers a higher resolution than the E-M10 II (15.9MP), but the D7100 nevertheless has larger individual pixels (pixel pitch of 3.91μm versus 3.76μm for the E-M10 II) due to its larger sensor. However, the E-M10 II is a much more recent model (by 2 years and 6 months) than the D7100, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. 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 Nikon D7100 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the D7100 for good quality output (200 dots per inch) amounts to 30 x 20 inches or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inches or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inches or 50.8 x 33.9 cm. The corresponding values for the Olympus E-M10 II 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 Nikon D7100 has a native sensitivity range from ISO 100 to ISO 6400, which can be extended to ISO 50-25600. The corresponding ISO settings for the Olympus OM-D E-M10 Mark II are ISO 200 to ISO 25600, with the possibility to increase the ISO range to 100-25600.

D7100 versus E-M10 II MP

For many cameras, data on sensor performance has been reported by DXO Mark. 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 review, the D7100 has a notably higher overall DXO score than the E-M10 II (overall score 10 points higher), which gives it an advantage in terms of imaging quality. This advantage is based on 1.1 bits higher color depth, 1.2 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
    Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Nikon D7100 APS-C 24.0 6000 40001080/60p24.213.7125683
2.
 
Olympus E-M10 II Four Thirds 15.9 4608 34561080/60p23.112.584273
3.
 
Canon 80D APS-C 24.0 6000 40001080/60p23.613.2113579
4.
 
Canon 70D APS-C 20.0 5472 36481080/30p22.511.692668
5.
 
Nikon D7500 APS-C 20.7 5568 37124K/30p24.314.0148386
6.
 
Nikon D500 APS-C 20.7 5568 37124K/30p24.014.0132483
7.
 
Nikon D7200 APS-C 24.0 6000 40001080/60p24.514.6133387
8.
 
Nikon D750 Full Frame 24.2 6016 40161080/60p24.814.5295693
9.
 
Nikon D610 Full Frame 24.2 6016 40161080/30p25.114.4292594
10.
 
Nikon D600 Full Frame 24.2 6016 40161080/30p25.114.2298094
11.
 
Nikon D7000 APS-C 16.1 4928 32641080/24p23.513.9116780
12.
 
Olympus E-M10 III Four Thirds 15.9 4608 34564K/30p23.112.8112074
13.
 
Olympus E-M5 II Four Thirds 15.9 4608 34561080/60p23.012.584273
14.
 
Olympus E-M10 Four Thirds 15.9 4608 34561080/30p22.812.388472
15.
 
Olympus E-PL7 Four Thirds 15.9 4608 34561080/30p22.712.487372
16.
 
Panasonic GX80 Four Thirds 15.8 4592 34484K/30p22.912.666271
17.
 
Sony RX10 1-inch 20.0 5472 36481080/60p22.912.647469
Note: DXO values in italics represent estimates based on sensor size and age.

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, and both provide the same movie specifications (1080/60p).

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the E-M10 II has an electronic viewfinder (2360k dots), while the D7100 has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The viewfinders of both cameras offer the same field of view (100%), but the viewfinder of the D7100 has a higher magnification than the one of the E-M10 II (0.63x vs 0.62x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The table below summarizes some of the other core capabilities of the Nikon D7100 and Olympus E-M10 II 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
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.
 
Nikon D7100optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
2.
 
Olympus E-M10 II2360 n3.0 / 1040 tilting Y 1/4000s 8.0/s Y Y
3.
 
Canon 80Doptical Y3.0 / 1040 swivel Y 1/8000s 7.0/s Y n
4.
 
Canon 70Doptical Y3.0 / 1040 swivel Y 1/8000s 7.0/s Y n
5.
 
Nikon D7500optical Y3.2 / 922 tilting Y 1/8000s 8.0/s Y n
6.
 
Nikon D500optical Y3.2 / 2359 tilting Y 1/8000s 10.0/s n n
7.
 
Nikon D7200optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
8.
 
Nikon D750optical Y3.2 / 1229 tilting n 1/4000s 6.0/s Y n
9.
 
Nikon D610optical Y3.2 / 921 fixed n 1/4000s 6.0/s Y n
10.
 
Nikon D600optical Y3.0 / 921 fixed n 1/4000s 5.5/s Y n
11.
 
Nikon D7000optical Y3.0 / 921 fixed n 1/8000s 6.0/s Y n
12.
 
Olympus E-M10 III2360 n3.0 / 1040 tilting Y 1/4000s 8.6/s Y Y
13.
 
Olympus E-M5 II2360 n3.0 / 1037 swivel Y 1/8000s 10.0/s n Y
14.
 
Olympus E-M101440 n3.0 / 1037 tilting Y 1/4000s 8.0/s Y Y
15.
 
Olympus E-PL7optional n3.0 / 1037 tilting Y 1/4000s 8.0/s n Y
16.
 
Panasonic GX802765 n3.0 / 1040 tilting Y 1/4000s 8.0/s Y Y
17.
 
Sony RX101440 Y3.0 / 1229 tilting n 1/3200s 10.0/s Y Y
Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that is present on the D7100, but is missing on the E-M10 II is a top-level LCD. While being, of course, smaller than the rear screen, the control panel conveys some of the essential shooting information and can be convenient for quick and easy settings verification.

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-M10 II 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 Nikon D7100 and the Olympus E-M10 II 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.

Concerning the storage of imaging data, both the D7100 and the E-M10 II write their files to SDXC cards. The D7100 features dual card slots, which can be very useful in case a memory card fails. In contrast, the E-M10 II 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.

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 Nikon D7100 and Olympus OM-D E-M10 Mark II 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
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Nikon D7100Ystereo / monoYYmini2.0---
2.
 
Olympus E-M10 IIYstereo / mono--micro2.0Y--
3.
 
Canon 80DYstereo / monoYYmini2.0YY-
4.
 
Canon 70DYstereo / monoY-mini2.0Y--
5.
 
Nikon D7500Ystereo / monoYYmini2.0Y-Y
6.
 
Nikon D500Ystereo / monoYYmini3.0YYY
7.
 
Nikon D7200Ystereo / monoYYmini2.0YY-
8.
 
Nikon D750Ystereo / monoYYmini2.0Y--
9.
 
Nikon D610Ymono / monoYYmini2.0---
10.
 
Nikon D600Ymono / monoYYmini2.0---
11.
 
Nikon D7000Ymono / monoY-mini2.0---
12.
 
Olympus E-M10 IIIYstereo / mono--micro2.0Y--
13.
 
Olympus E-M5 IIYstereo / monoY-micro2.0Y--
14.
 
Olympus E-M10Ystereo / mono--micro2.0Y--
15.
 
Olympus E-PL7Ystereo / mono--micro2.0Y--
16.
 
Panasonic GX80Ystereo / mono--micro2.0Y--
17.
 
Sony RX10Ystereo / monoYYmicro2.0YY-

It is notable that the D7100 has a microphone port, which is missing on the E-M10 II. Such an external microphone input can help to substantially improve the quality of audio recordings when a good external microphone is used.

Both the D7100 and the E-M10 II have been discontinued, but can regularly be found used on eBay. The D7100 was replaced by the Nikon D7200, while the E-M10 II was followed by the Olympus E-M10 III. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Nikon and Olympus websites.

Review summary

So what is the bottom line? Is there a clear favorite between the Nikon D7100 and the Olympus E-M10 II? Which camera is better? The listing below highlights the relative strengths of the two models.

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Reasons to prefer the Nikon D7100:

  • More detail: Offers more megapixels (24 vs 15.9MP) with a 25% higher linear resolution.
  • Better image quality: Scores markedly higher (10 points) in the DXO overall assessment.
  • Richer colors: Generates images with noticeably better colors (1.1 bits more color depth).
  • More dynamic range: Captures a larger spectrum of light and dark details (1.2 EV of extra DR).
  • Better low-light sensitivity: Requires less light for good images (0.6 stops ISO advantage).
  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Better sound control: Has a headphone port that enables audio monitoring while recording.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.63x vs 0.62x).
  • Easier setting verification: Features an LCD display on top to control 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 (1229k vs 1040k dots).
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Longer lasting: Can take more shots (950 versus 320) on a single battery charge.
  • Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More heavily discounted: Has been available for much longer (launched in February 2013).

ilogo

Advantages of the Olympus OM-D E-M10 Mark II:

  • More framing info: Has an electronic viewfinder that displays shooting data.
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • Faster burst: Shoots at higher frequency (8 vs 6 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • More compact: Is smaller (120x83mm vs 136x107mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 375g or 49 percent) and is thus easier to take along.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • More legacy lens friendly: Can use many non-native lenses via adapters.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • More affordable: Was introduced into a lower priced category (46 percent cheaper at launch).
  • More modern: Reflects 2 years and 6 months of technical progress since the D7100 launch.

If the number of relative strengths (bullet points above) is taken as a guide, the D7100 is the clear winner of the match-up (17 : 12 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 wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

D7100 17:12 E-M10 II

How about other alternatives? Do the specifications of the Nikon D7100 and the Olympus E-M10 II place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens 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 D7100 and the E-M10 II in practical situations. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is why hands-on reviews by experts are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

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Expert Camera Reviews
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Nikon D71005/5+ +..85/1004.5/54.5/5 Feb 2013 1,199i
2.
 
Olympus E-M10 II4.5/5+ +..80/1005/55/5 Aug 2015 649i
3.
 
Canon 80D4/5+ +4.5/584/1004.5/54.5/5 Feb 2016 1,199i
4.
 
Canon 70D5/5+ +..83/1004.5/55/5 Jul 2013 1,199i
5.
 
Nikon D75004.5/5+ +4.5/586/1005/54.5/5 Apr 2017 1,299 i
6.
 
Nikon D5005/5+ +4.7/591/1004.5/55/5 Jan 2016 1,999 i
7.
 
Nikon D72004/5+ +..84/1004.5/54.5/5 Mar 2015 1,199i
8.
 
Nikon D7505/5+ +4/590/1004.5/54.5/5 Sep 2014 2,299i
9.
 
Nikon D6104/5+ +..87/1004.5/54.5/5 Oct 2013 1,999 i
10.
 
Nikon D6004/5+ +..87/1005/54.5/5 Sep 2012 2,099i
11.
 
Nikon D70004/5....80/1004.5/54.5/5 Sep 2010 1,499i
12.
 
Olympus E-M10 III..+5/580/1004.5/54.5/5 Aug 2017 649i
13.
 
Olympus E-M5 II5/5+ +4.5/581/1005/55/5 Feb 2015 1,099i
14.
 
Olympus E-M104/5....80/1005/55/5 Jan 2014 699i
15.
 
Olympus E-PL74/5+....5/54/5 Aug 2014 599i
16.
 
Panasonic GX804.5/5+ +..82/1005/55/5 Apr 2016 799 i
17.
 
Sony RX105/5+..80/1004.5/54.5/5 Oct 2013 1,299i
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted 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 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.

Nikon D7100:
Check Ebay offers
Olympus E-M10 II:
Check Ebay offers

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 use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Nikon D7100 vs Olympus E-M10 II

    Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.

    Camera Specifications
    Camera Model Nikon D7100 Olympus E-M10 II
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Nikon F mount lenses Micro Four Thirds lenses
    Launch Date February 2013 August 2015
    Launch Price USD 1,199 USD 649
    Sensor Specs Nikon D7100 Olympus E-M10 II
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor Four Thirds Sensor
    Sensor Size 23.5 x 15.6 mm 17.3 x 13.0 mm
    Sensor Area 366.6 mm2 224.9 mm2
    Sensor Diagonal 28.2 mm 21.6 mm
    Crop Factor 1.5x 2.0x
    Sensor Resolution 24 Megapixels 15.9 Megapixels
    Image Resolution 6000 x 4000 pixels 4608 x 3456 pixels
    Pixel Pitch 3.91 μm 3.76 μm
    Pixel Density 6.55 MP/cm2 7.08 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 1080/60p Video 1080/60p Video
    ISO Setting 100 - 6,400 ISO 200 - 25,600 ISO
    ISO Boost 50 - 25,600 ISO 100 - 25,600 ISO
    Image Processor EXPEED 4 TruePic VII
    DXO Sensor Quality (score) 83 73
    DXO Color Depth (bits) 24.2 23.1
    DXO Dynamic Range (EV) 13.7 12.5
    DXO Low Light (ISO) 1256 842
    Screen Specs Nikon D7100 Olympus E-M10 II
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.63x 0.62x
    Viewfinder Resolution 2360k dots
    Top-Level Screen Control Panel no Top Display
    LCD Framing Live View Live View
    Rear LCD Size 3.2inch 3.0inch
    LCD Resolution 1229k dots 1040k dots
    LCD Attachment Fixed screen Tilting screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Nikon D7100 Olympus E-M10 II
    Focus System Phase-detect AF Contrast-detect AF
    Manual Focusing Aidno Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/8000s 1/4000s
    Continuous Shooting 6 shutter flaps/s 8 shutter flaps/s
    Electronic Shutterno E-Shutterup to 1/16000s
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Built-in Flash Built-in Flash
    Storage Medium SDXC cards SDXC cards
    Second Storage Option Dual card slots Single card slot
    UHS card support UHS-I UHS-I
    Connectivity Specs Nikon D7100 Olympus E-M10 II
    External Flash Hotshoe Hotshoe
    USB Connector USB 2.0 USB 2.0
    HDMI Port mini HDMI micro HDMI
    Microphone Port External MIC port no MIC socket
    Headphone Socket Headphone port no Headphone port
    Wifi Support no Wifi Wifi built-in
    Body Specs Nikon D7100 Olympus E-M10 II
    Environmental SealingWeathersealed bodynot weather sealed
    Battery Type EN-EL15 BLS-50
    Battery Life (CIPA)950 shots per charge320 shots per charge
    Body Dimensions 136 x 107 x 76 mm
    (5.4 x 4.2 x 3.0 in)
    120 x 83 x 47 mm
    (4.7 x 3.3 x 1.9 in)
    Camera Weight 765 g (27.0 oz) 390 g (13.8 oz)
    Nikon D7100:
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    Olympus E-M10 II:
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