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Nikon D3100 vs Olympus E-P1

The Nikon D3100 and the Olympus PEN E-P1 are two digital cameras that were revealed to the public, respectively, in August 2010 and June 2009. The D3100 is a DSLR, while the E-P1 is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (D3100) and a Four Thirds (E-P1) sensor. The Nikon has a resolution of 14.2 megapixels, whereas the Olympus 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
Nikon D3100 VS Olympus E-P1
Nikon D3100 Olympus E-P1
Digital single lens reflex Mirrorless system camera
Nikon F mount lenses Micro Four Thirds lenses
14.2 MP, APS-C Sensor 12.2 MP, Four Thirds Sensor
1080/24p Video 720/30p Video
ISO 100-3200 (100-12800) ISO 100-6400
Optical viewfinder No viewfinder, LCD framing
3.0" LCD, 230k dots 3.0" LCD, 230k dots
Fixed screen (not touch-sensitive) Fixed screen (not touch-sensitive)
3 shutter flaps per second 3 shutter flaps per second
Lens stabilization onlyIn-body stabilization
550 shots per battery charge300 shots per battery charge
124 x 96 x 75 mm, 505 g 121 x 70 x 36 mm, 355 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D3100 and the Olympus PEN E-P1? 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

An illustration of the physical size and weight of the Nikon D3100 and the Olympus E-P1 is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth dimensions are rounded to the nearest millimeter.

The D3100 can be obtained in two different colors (black, red), while the E-P1 is available in three color-versions (black, silver, white).

Size Nikon D3100 vs Olympus E-P1
Compare D3100 versus E-P1 top
Comparison D3100 or E-P1 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-P1 is notably smaller (29 percent) than the Nikon D3100. Moreover, the E-P1 is markedly lighter (30 percent) than the D3100. In this context, it is worth noting that neither the D3100 nor the E-P1 are weather-sealed.

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 (D3100) and the Micro Four Thirds Lens Catalog (E-P1). Mirrorless cameras, such as the E-P1, 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 D3100 gets 550 shots out of its EN-EL14 battery, while the E-P1 can take 300 images on a single charge of its BLS-1 power pack.

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, just select a new right or left comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

Camera Body Specifications
  Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(yes/no)
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Camera
Model
 
Nikon D3100» 4.9 in 3.8 in 3.0 in 17.8 oz 550 n Aug 2010 599iNikon D3100
 
Olympus E-P1« 4.8 in 2.8 in 1.4 in 12.5 oz 300 n Jun 2009 799iOlympus E-P1
 
Nikon D3200« » 4.9 in 3.8 in 3.0 in 17.8 oz 540 n Apr 2012 599iNikon D3200
 
Nikon D5100« » 5.0 in 3.8 in 3.1 in 19.8 oz 660 n Apr 2011 749iNikon D5100
 
Nikon D7000« » 5.2 in 4.1 in 3.0 in 27.5 oz 1050 Y Sep 2010 1,499iNikon D7000
 
Nikon D3000« » 5.0 in 3.8 in 2.5 in 18.9 oz 500 n Jul 2009 599iNikon D3000
 
Nikon D5000« » 5.0 in 4.1 in 3.1 in 20.8 oz 510 n Apr 2009 749iNikon D5000
 
Nikon D60« » 5.0 in 3.7 in 2.5 in 18.4 oz 500 n Jan 2008 629iNikon D60
 
Nikon D40X« » 4.9 in 3.7 in 2.5 in 18.4 oz 520 n Mar 2007 729iNikon D40X
 
Nikon D40« » 4.9 in 3.7 in 2.5 in 18.4 oz 470 n Nov 2006 499iNikon D40
 
Olympus E-P3« » 4.8 in 2.7 in 1.3 in 13.0 oz 330 n Jun 2011 799iOlympus E-P3
 
Olympus E-PL2« » 4.5 in 2.8 in 1.7 in 12.8 oz 280 n Jan 2011 599iOlympus E-PL2
 
Olympus E-PL3« » 4.3 in 2.5 in 1.5 in 11.0 oz 300 n Jun 2011 599iOlympus E-PL3
 
Olympus E-P2« » 4.8 in 2.8 in 1.4 in 12.5 oz 300 n Nov 2009 799iOlympus E-P2
 
Panasonic GH1« » 4.9 in 3.5 in 1.8 in 13.6 oz 300 n Mar 2009 899iPanasonic GH1
 
Sony NEX-5N« » 4.4 in 2.3 in 1.5 in 9.5 oz 460 n Aug 2011 699iSony NEX-5N
 
Sony NEX-C3« » 4.3 in 2.4 in 1.3 in 7.9 oz 400 n Jun 2011 599iSony NEX-C3
Note: Measurements and pricing do not include easily detachable parts, such as interchangeable lenses or optional viewfinders.

Any camera decision will obviously take relative prices into account. The 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 D3100 was launched at a somewhat lower price (by 25 percent) than the E-P1, which makes it more attractive for photographers on a tight budget. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

 

Sensor comparison

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors 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. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its 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 Nikon D3100 features an APS-C sensor and the Olympus E-P1 a Four Thirds sensor. The sensor area in the E-P1 is 37 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 D3100 has a native 3:2 aspect ratio, while the one in the E-P1 offers a 4:3 aspect.

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors.

Nikon D3100 and Olympus E-P1 sensor measures

With 14.2MP, the D3100 offers a higher resolution than the E-P1 (12.2MP), but the D3100 nevertheless has larger individual pixels (pixel pitch of 5.01μm versus 4.29μm for the E-P1) due to its larger sensor. Moreover, the D3100 is a somewhat more recent model (by 1 year and 2 months) than the E-P1, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels.

The resolution advantage of the Nikon D3100 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the D3100 for good quality output (200 dots per inch) amounts to 23 x 15.4 inch or 58.5 x 39 cm, for very good quality (250 dpi) 18.4 x 12.3 inch or 46.8 x 31.2 cm, and for excellent quality (300 dpi) 15.4 x 10.2 inch or 39 x 26 cm. The corresponding values for the Olympus E-P1 are 20.2 x 15.1 inch or 51.2 x 38.4 cm for good quality, 16.1 x 12.1 inch or 41 x 30.7 cm for very good quality, and 13.4 x 10.1 inch or 34.1 x 25.6 cm for excellent quality prints.

The Nikon D3100 has a native sensitivity range from ISO 100 to ISO 3200, which can be extended to ISO 100-12800. The corresponding ISO settings for the Olympus PEN E-P1 are ISO 100 to ISO 6400 (no boost).

D3100 versus E-P1 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 D3100 provides substantially higher image quality than the E-P1, with an overall score that is 12 points higher. This advantage is based on 1.1 bits higher color depth, 0.9 EV in additional dynamic range, and 0.8 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

Sensor Characteristics
  Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Camera
Model
 
Nikon D3100 APS-C 14.2 4608 30721080/24p22.511.391967Nikon D3100
 
Olympus E-P1 Four Thirds 12.2 4032 3024720/30p21.410.453655Olympus E-P1
 
Nikon D3200 APS-C 24.1 6016 40001080/30p24.113.2113181Nikon D3200
 
Nikon D5100 APS-C 16.1 4928 32641080/30p23.513.6118380Nikon D5100
 
Nikon D7000 APS-C 16.1 4928 326410800/24p23.513.9116780Nikon D7000
 
Nikon D3000 APS-C 10.0 3872 2592none22.311.156362Nikon D3000
 
Nikon D5000 APS-C 12.2 4288 2848720/24p22.712.586872Nikon D5000
 
Nikon D60 APS-C 10.0 3872 2592none22.511.456265Nikon D60
 
Nikon D40X APS-C 10.0 3872 2592none22.411.451663Nikon D40X
 
Nikon D40 APS-C 6.0 3008 2000none21.011.056156Nikon D40
 
Olympus E-P3 Four Thirds 12.2 4032 30241080/60i20.810.153651Olympus E-P3
 
Olympus E-PL2 Four Thirds 12.2 4032 3024720/30p21.410.257355Olympus E-PL2
 
Olympus E-PL3 Four Thirds 12.2 4032 30241080/60i20.910.349952Olympus E-PL3
 
Olympus E-P2 Four Thirds 12.2 4032 3024720/30p21.510.450556Olympus E-P2
 
Panasonic GH1 Four Thirds 12.0 4000 30001080/24p21.611.677264Panasonic GH1
 
Sony NEX-5N APS-C 16.0 4912 32641080/60i23.612.7107977Sony NEX-5N
 
Sony NEX-C3 APS-C 16.0 4912 3264720/30p22.712.2108373Sony NEX-C3

Many modern cameras are not only capable of taking still images, but can also record movies. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the D3100 provides a higher video resolution than the E-P1. It can shoot video footage at 1080/24p, while the Olympus is limited to 720/30p.

 

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the D3100 has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the E-P1 relies on live view and the rear LCD for framing. The adjacent table lists some of the other core features of the Nikon D3100 and Olympus E-P1 along with similar information for a selection of comparators.

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
Camera
Model
 
Nikon D3100optical n 3.0 230 fixed n 1/4000s 3.0 Y n Nikon D3100
 
Olympus E-P1none n 3.0 230 fixed n 1/4000s 3.0 n Y Olympus E-P1
 
Nikon D3200optical n 3.0 921 fixed n 1/4000s 4.0 Y n Nikon D3200
 
Nikon D5100optical n 3.0 921 swivel n 1/4000s 4.0 Y n Nikon D5100
 
Nikon D7000optical Y 3.0 921 fixed n 1/8000s 6.0 Y n Nikon D7000
 
Nikon D3000optical n 3.0 230 fixed n 1/4000s 3.0 Y n Nikon D3000
 
Nikon D5000optical n 2.7 230 full-flex n 1/4000s 4.0 Y n Nikon D5000
 
Nikon D60optical n 2.5 230 fixed n 1/4000s 3.0 Y n Nikon D60
 
Nikon D40Xoptical n 2.5 230 fixed n 1/4000s 3.0 Y n Nikon D40X
 
Nikon D40optical n 2.5 230 fixed n 1/4000s 2.5 Y n Nikon D40
 
Olympus E-P3optional n 3.0 614 fixed Y 1/4000s 3.0 Y Y Olympus E-P3
 
Olympus E-PL2optional n 3.0 460 fixed n 1/4000s 3.0 Y Y Olympus E-PL2
 
Olympus E-PL3optional n 3.0 460 tilting n 1/4000s 5.5 n Y Olympus E-PL3
 
Olympus E-P2optional n 3.0 230 fixed n 1/4000s 3.0 n Y Olympus E-P2
 
Panasonic GH11440 n 3.0 460 swivel n 1/4000s 3.0 Y n Panasonic GH1
 
Sony NEX-5Noptional n 3.0 920 tilting Y 1/4000s 10.0 n n Sony NEX-5N
 
Sony NEX-C3optional n 3.0 920 tilting n 1/4000s 5.5 n n Sony NEX-C3

One difference between the cameras concerns the presence of an on-board flash. The D3100 has one, while the E-P1 does not. While the built-in flash of the D3100 is not very powerful, it can at times be useful as a fill-in light.

The D3100 writes its imaging data to SDXC cards, while the E-P1 uses SDHC cards.

 

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 D3100 and Olympus PEN E-P1 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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
Camera
Model
 
Nikon D3100Ymonomono--mini2.0---Nikon D3100
 
Olympus E-P1Ystereonone--mini2.0---Olympus E-P1
 
Nikon D3200YmonomonoY-mini2.0---Nikon D3200
 
Nikon D5100YmonomonoY-mini2.0---Nikon D5100
 
Nikon D7000YmonomonoY-mini2.0---Nikon D7000
 
Nikon D3000Ynonenone--none2.0---Nikon D3000
 
Nikon D5000Ymonomono--mini2.0---Nikon D5000
 
Nikon D60Ynonenone--none2.0---Nikon D60
 
Nikon D40XYnonenone--none2.0---Nikon D40X
 
Nikon D40Ynonenone--none2.0---Nikon D40
 
Olympus E-P3Ystereonone--mini2.0---Olympus E-P3
 
Olympus E-PL2Ystereonone--mini2.0---Olympus E-PL2
 
Olympus E-PL3Ystereonone--mini2.0---Olympus E-PL3
 
Olympus E-P2Ystereonone--mini2.0---Olympus E-P2
 
Panasonic GH1YstereononeY-mini2.0---Panasonic GH1
 
Sony NEX-5NYstereomono--mini2.0---Sony NEX-5N
 
Sony NEX-C3Ystereomono--mini2.0---Sony NEX-C3

Both the D3100 and the E-P1 have been discontinued, but can regularly be found used on eBay. The E-P1 was replaced by the Olympus E-P2, while the D3100 was followed by the Nikon D3200. 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 how do things add up? Is there a clear favorite between the Nikon D3100 and the Olympus E-P1? Which camera is better? Below is a summary of the relative strengths of each of the two contestants.

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Arguments in favor of the Nikon D3100:

  • More detail: Offers more megapixels (14.2 vs 12.2MP) with a 10% higher linear resolution.
  • Better image quality: Scores substantially higher (12 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 (0.9 EV of extra DR).
  • Better low-light sensitivity: Requires less light for good images (0.8 stops ISO advantage).
  • Better video: Provides higher definition movie capture (1080/24p vs 720/30p).
  • Easier framing: Has an optical viewfinder for image composition and settings control.
  • Longer lasting: Can take more shots (550 versus 300) on a single battery charge.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • More affordable: Was introduced into a lower priced segment (25 percent cheaper at launch).
  • More modern: Is somewhat more recent (announced 1 year and 2 months after the E-P1).

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Advantages of the Olympus PEN E-P1:

  • More compact: Is smaller (121x70mm vs 124x96mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 150g or 30 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.
  • More heavily discounted: Has been on the market for longer (launched in June 2009).

If the count of individual advantages (bullet points above) is taken as a guide, the D3100 is the clear winner of the match-up (11 : 5 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 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.

D3100 11:05 E-P1

How about other alternatives? Do the specifications of the Nikon D3100 and the Olympus E-P1 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 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 D3100 or the E-P1. 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 following table reports the overall ratings of the cameras as published by some of the major camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, and photographyblog). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

Review Scores
  Camera
Model
cam
era
  labs  
dp
re
  view  
e
photo
  zine  
ima
ging
resource
photo
graphy
  blog  
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Camera
Model
 
Nikon D3100+ +72/1004.5/55/54.5/5 Aug 2010 599iNikon D3100
 
Olympus E-P1+66/1004/54/54.5/5 Jun 2009 799iOlympus E-P1
 
Nikon D3200+ +73/1004.5/54.5/54.5/5 Apr 2012 599iNikon D3200
 
Nikon D5100+ +76/1004.5/55/54.5/5 Apr 2011 749iNikon D5100
 
Nikon D7000..80/1004.5/55/54.5/5 Sep 2010 1,499iNikon D7000
 
Nikon D3000+72/1004/53.5/54.5/5 Jul 2009 599iNikon D3000
 
Nikon D5000+ +75/1004/55/54.5/5 Apr 2009 749iNikon D5000
 
Nikon D6080/100+ +4/5o4.5/5 Jan 2008 629iNikon D60
 
Nikon D40X79/100+ +4/5o4/5 Mar 2007 729iNikon D40X
 
Nikon D4081/100+ +o5/54.5/5 Nov 2006 499iNikon D40
 
Olympus E-P383/10074/1004.5/54.5/54.5/5 Jun 2011 799iOlympus E-P3
 
Olympus E-PL283/10071/1004.5/54.5/54.5/5 Jan 2011 599iOlympus E-PL2
 
Olympus E-PL3+ +72/1004.5/5..4/5 Jun 2011 599iOlympus E-PL3
 
Olympus E-P2+69/1004/54.5/54.5/5 Nov 2009 799iOlympus E-P2
 
Panasonic GH1+ +72/1004.5/55/54.5/5 Mar 2009 899iPanasonic GH1
 
Sony NEX-5N+ +79/1004.5/55/54.5/5 Aug 2011 699iSony NEX-5N
 
Sony NEX-C3+ +74/1004.5/54.5/54/5 Jun 2011 599iSony NEX-C3
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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparisons of ratings among very different cameras or across long time periods have little meaning. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Nikon D3100:
Check Ebay offers
Olympus E-P1:
Check Ebay offers

Other camera comparisons

Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just use the search menu below. 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: Nikon D3100 vs Olympus E-P1

    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 D3100 Olympus E-P1
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Nikon F mount lenses Micro Four Thirds lenses
    Launch Date August 2010 June 2009
    Launch Price USD 599 USD 799
    Sensor Specs Nikon D3100 Olympus E-P1
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor Four Thirds Sensor
    Sensor Size 23.1 x 15.4 mm 17.3 x 13.0 mm
    Sensor Area 355.74 mm2 224.9 mm2
    Sensor Diagonal 27.8 mm 21.6 mm
    Crop Factor 1.5x 2.0x
    Sensor Resolution 14.2 Megapixels 12.2 Megapixels
    Image Resolution 4608 x 3072 pixels 4032 x 3024 pixels
    Pixel Pitch 5.01 μm 4.29 μm
    Pixel Density 3.98 MP/cm2 5.42 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability 1080/24p Video 720/30p Video
    ISO Setting 100-3200 ISO 100-6400 ISO
    ISO Boost 100-12800 ISO no Enhancement
    Image Processor EXPEED 2 TruePic V
    DXO Sensor Quality (score) 67 55
    DXO Color Depth (bits) 22.5 21.4
    DXO Dynamic Range (EV) 11.3 10.4
    DXO Low Light (ISO) 919 536
    Screen Specs Nikon D3100 Olympus E-P1
    Viewfinder Type Optical viewfinder No viewfinder
    Viewfinder Field of View 95%
    Viewfinder Magnification 0.53x
    LCD Framing Live View Live View
    Rear LCD Size 3.0 inch 3.0 inch
    LCD Resolution 230k dots 230k dots
    LCD Attachment Fixed screen Fixed screen
    Shooting Specs Nikon D3100 Olympus E-P1
    Focus System Phase-detect AF Contrast-detect AF
    Continuous Shooting 3 shutter flaps/s 3 shutter flaps/s
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Build-in Flash no On-Board Flash
    Storage Medium SDXC cards SDHC cards
    Second Storage Option Single card slot Single card slot
    UHS card support no no
    Connectivity Specs Nikon D3100 Olympus E-P1
    External Flash Hotshoe Hotshoe
    USB Connector USB 2.0 USB 2.0
    HDMI Port mini HDMI mini HDMI
    Wifi Support no Wifi no Wifi
    Body Specs Nikon D3100 Olympus E-P1
    Battery Type EN-EL14 BLS-1
    Battery Life (CIPA)550 shots per charge300 shots per charge
    Body Dimensions 124 x 96 x 75 mm
    (4.9 x 3.8 x 3.0 in)
    121 x 70 x 36 mm
    (4.8 x 2.8 x 1.4 in)
    Camera Weight 505 g (17.8 oz) 355 g (12.5 oz)

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