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Nikon D3100 vs Olympus E-520

The Nikon D3100 and the Olympus E-520 are two digital cameras that were officially introduced, respectively, in August 2010 and May 2008. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (D3100) and a Four Thirds (E-520) sensor. The Nikon has a resolution of 14.2 megapixels, whereas the Olympus provides 10 MP.

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

Headline Specifications
Nikon D3100
versus
Olympus E-520
Nikon D3100   Olympus E-520
Digital single lens reflex Digital single lens reflex
Nikon F mount lenses Four Thirds lenses
14.2 MP – APS-C sensor 10 MP – Four Thirds sensor
1080/24p Video no Video
ISO 100-3,200 (100 - 12,800) ISO 100-1,600
Optical viewfinder Optical viewfinder
3.0" LCD – 230k dots 2.7" LCD – 215k dots
Fixed screen (not touch-sensitive) Fixed screen (not touch-sensitive)
3 shutter flaps per second 3.5 shutter flaps per second
Lens stabilization onlyIn-body stabilization
550 shots per battery charge750 shots per battery charge
124 x 96 x 75 mm, 505 g 136 x 92 x 68 mm, 535 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D3100 and the Olympus E-520? 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

An illustration of the physical size and weight of the Nikon D3100 and the Olympus E-520 is provided 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 dimensions are rounded to the nearest millimeter.

The D3100 can be obtained in two different colors (black, red), while the E-520 is only available in black.

Size Nikon D3100 vs Olympus E-520
Compare D3100 versus E-520 top
Comparison D3100 or E-520 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-520 is somewhat larger (5 percent) than the Nikon D3100. Moreover, the E-520 is markedly heavier (6 percent) than the D3100. In this context, it is worth noting that neither the D3100 nor the E-520 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 Four Thirds Lens Catalog (E-520).

Concerning battery life, the D3100 gets 550 shots out of its Nikon EN-EL14 battery, while the E-520 can take 750 images on a single charge of its Olympus BLM-1 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
# image Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Nikon D3100 124 mm 96 mm 75 mm 505 g 550 n Aug 2010 599ebay.com
2.
 
Olympus E-520 136 mm 92 mm 68 mm 535 g 750 n May 2008 699ebay.com
3.
 
Nikon D5600 124 mm 97 mm 70 mm 465 g 970 n Nov 2016 699ebay.com
4.
 
Nikon D3400 124 mm 98 mm 76 mm 445 g 1200 n Aug 2016 499ebay.com
5.
 
Nikon D3300 124 mm 98 mm 76 mm 430 g 700 n Jan 2014 499ebay.com
6.
 
Nikon D3200 125 mm 96 mm 77 mm 505 g 540 n Apr 2012 599ebay.com
7.
 
Nikon D5100 128 mm 97 mm 79 mm 560 g 660 n Apr 2011 749ebay.com
8.
 
Nikon D3000 126 mm 97 mm 64 mm 536 g 500 n Jul 2009 599ebay.com
9.
 
Nikon D5000 127 mm 104 mm 80 mm 590 g 510 n Apr 2009 749ebay.com
10.
 
Nikon D60 126 mm 94 mm 64 mm 522 g 500 n Jan 2008 629ebay.com
11.
 
Nikon D40X 124 mm 94 mm 64 mm 522 g 520 n Mar 2007 729ebay.com
12.
 
Nikon D40 124 mm 94 mm 64 mm 522 g 470 n Nov 2006 499ebay.com
13.
 
Olympus E-600 130 mm 94 mm 60 mm 535 g 500 n Aug 2009 449ebay.com
14.
 
Olympus E-620 130 mm 94 mm 60 mm 521 g 500 n Feb 2009 699ebay.com
15.
 
Olympus E-420 130 mm 91 mm 53 mm 440 g 500 n Mar 2008 599ebay.com
16.
 
Olympus E-410 130 mm 91 mm 53 mm 435 g 500 n Mar 2007 699ebay.com
17.
 
Olympus E-510 136 mm 92 mm 68 mm 538 g 750 n Mar 2007 799ebay.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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The price is, of course, an important factor in any camera decision. 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 14 percent) than the E-520, 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.

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. 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 more expensive and 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-520 a Four Thirds sensor. The sensor area in the E-520 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-520 offers a 4:3 aspect.

Nikon D3100 and Olympus E-520 sensor measures

With 14.2MP, the D3100 offers a higher resolution than the E-520 (10MP), but the D3100 nevertheless has larger individual pixels (pixel pitch of 5.01μm versus 4.74μm for the E-520) due to its larger sensor. Moreover, the D3100 is a much more recent model (by 2 years and 3 months) than the E-520, and its sensor will 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 inches or 58.5 x 39 cm, for very good quality (250 dpi) 18.4 x 12.3 inches or 46.8 x 31.2 cm, and for excellent quality (300 dpi) 15.4 x 10.2 inches or 39 x 26 cm. The corresponding values for the Olympus E-520 are 18.2 x 13.7 inches or 46.3 x 34.7 cm for good quality, 14.6 x 10.9 inches or 37.1 x 27.8 cm for very good quality, and 12.2 x 9.1 inches or 30.9 x 23.2 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 E-520 are ISO 100 to ISO 1600 (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.

D3100 versus E-520 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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 review, the D3100 provides substantially higher image quality than the E-520, 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 0.7 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.
 
Nikon D3100 APS-C 14.2 4608 30721080/24p22.511.391967
2.
 
Olympus E-520 Four Thirds 10.0 3648 2736none21.410.454855
3.
 
Nikon D5600 APS-C 24.0 6000 40001080/60p24.114.0130684
4.
 
Nikon D3400 APS-C 24.0 6000 40001080/60p24.813.9119286
5.
 
Nikon D3300 APS-C 24.0 6000 40001080/60p24.312.8138582
6.
 
Nikon D3200 APS-C 24.1 6016 40001080/30p24.113.2113181
7.
 
Nikon D5100 APS-C 16.1 4928 32641080/30p23.513.6118380
8.
 
Nikon D3000 APS-C 10.0 3872 2592none22.311.156362
9.
 
Nikon D5000 APS-C 12.2 4288 2848720/24p22.712.586872
10.
 
Nikon D60 APS-C 10.0 3872 2592none22.511.456265
11.
 
Nikon D40X APS-C 10.0 3872 2592none22.411.451663
12.
 
Nikon D40 APS-C 6.0 3008 2000none21.011.056156
13.
 
Olympus E-600 Four Thirds 12.2 4032 3024none21.510.354155
14.
 
Olympus E-620 Four Thirds 12.2 4032 3024none21.310.353655
15.
 
Olympus E-420 Four Thirds 10.0 3648 2736none21.510.452756
16.
 
Olympus E-410 Four Thirds 10.0 3648 2736none21.110.049451
17.
 
Olympus E-510 Four Thirds 10.0 3648 2736none21.210.044252
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Many modern cameras are not only capable of taking still images, but also of capturing video footage. The D3100 indeed provides movie recording capabilities, while the E-520 does not. The highest resolution format that the D3100 can use is 1080/24p.

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Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. The D3100 and the E-520 are similar in the sense that both have an optical viewfinder. The latter is useful for getting a clear image for framing even in brightly lit environments. The viewfinders of both cameras offer the same field of view (95%), but the viewfinder of the D3100 has a higher magnification than the one of the E-520 (0.53x vs 0.46x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The adjacent table lists some of the other core features of the Nikon D3100 and Olympus E-520 along with similar information for a selection of comparators.

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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.
 
Nikon D3100optical n3.0 / 230 fixed n 1/4000s 3.0/s Y n
2.
 
Olympus E-520optical n2.7 / 215 fixed n 1/4000s 3.5/s Y Y
3.
 
Nikon D5600optical n3.2 / 1037 swivel Y 1/4000s 5.0/s Y n
4.
 
Nikon D3400optical n3.0 / 921 fixed n 1/4000s 5.0/s Y n
5.
 
Nikon D3300optical n3.0 / 921 fixed n 1/4000s 5.0/s Y n
6.
 
Nikon D3200optical n3.0 / 921 fixed n 1/4000s 4.0/s Y n
7.
 
Nikon D5100optical n3.0 / 921 swivel n 1/4000s 4.0/s Y n
8.
 
Nikon D3000optical n3.0 / 230 fixed n 1/4000s 3.0/s Y n
9.
 
Nikon D5000optical n2.7 / 230 full-flex n 1/4000s 4.0/s Y n
10.
 
Nikon D60optical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
11.
 
Nikon D40Xoptical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
12.
 
Nikon D40optical n2.5 / 230 fixed n 1/4000s 2.5/s Y n
13.
 
Olympus E-600optical n2.7 / 230 swivel n 1/4000s 4.0/s Y Y
14.
 
Olympus E-620optical n2.7 / 230 swivel n 1/4000s 4.0/s Y Y
15.
 
Olympus E-420optical n2.7 / 215 fixed n 1/4000s 3.5/s Y n
16.
 
Olympus E-410optical n2.5 / 215 fixed n 1/4000s 3.0/s Y n
17.
 
Olympus E-510optical n2.5 / 215 fixed n 1/4000s 3.0/s Y Y
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-520 and the D3100 is in-body image stabilization (IBIS). The E-520 reduces the risk of handshake-induced blur with all attached lenses, while the D3100 offers no blur reduction with lenses that themselves do not provide optical image stabilization.

The D3100 writes its imaging data to SDXC cards, while the E-520 uses Compact Flash or xD Picture cards. The E-520 features dual card slots, which can be very useful in case a memory card fails. In contrast, the D3100 only has one slot.

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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 Nikon D3100 and Olympus E-520 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.
 
Nikon D3100Ymono / mono--mini2.0---
2.
 
Olympus E-520Y- / ----2.0---
3.
 
Nikon D5600Ystereo / monoY-mini2.0YYY
4.
 
Nikon D3400Ymono / mono--mini2.0--Y
5.
 
Nikon D3300Ymono / monoY-mini2.0---
6.
 
Nikon D3200Ymono / monoY-mini2.0---
7.
 
Nikon D5100Ymono / monoY-mini2.0---
8.
 
Nikon D3000Y- / ----2.0---
9.
 
Nikon D5000Ymono / mono--mini2.0---
10.
 
Nikon D60Y- / ----2.0---
11.
 
Nikon D40XY- / ----2.0---
12.
 
Nikon D40Y- / ----2.0---
13.
 
Olympus E-600Y- / ----2.0---
14.
 
Olympus E-620Y- / ----2.0---
15.
 
Olympus E-420Y- / ----2.0---
16.
 
Olympus E-410Y- / ----2.0---
17.
 
Olympus E-510Y- / ----2.0---
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Both the D3100 and the E-520 have been discontinued, but can regularly be found used on ebay. The D3100 was replaced by the Nikon D3200, while the E-520 does not have a direct successor. Further information on the features and operation of the D3100 and E-520 can be found, respectively, in the Nikon D3100 Manual (free pdf) or the online Olympus E-520 Manual.

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Review summary

So what is the bottom line? Is the Nikon D3100 better than the Olympus E-520 or vice versa? Below is a summary of the relative strengths of each of the two contestants.

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Advantages of the Nikon D3100:

  • More detail: Offers more megapixels (14.2 vs 10MP) with a 21% 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 (0.7 stops ISO advantage).
  • Broader imaging potential: Can record not only still images but also 1080/24p movies.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.53x vs 0.46x).
  • Larger screen: Has a bigger rear LCD (3.0" vs 2.7") for image review and settings control.
  • More affordable: Was introduced into a lower priced segment (14 percent cheaper at launch).
  • More modern: Reflects 2 years and 3 months of technical progress since the E-520 launch.

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Arguments in favor of the Olympus E-520:

  • Faster burst: Shoots at higher frequency (3.5 vs 3 flaps/sec) to capture the decisive moment.
  • Longer lasting: Gets more shots (750 versus 550) out of a single battery charge.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More heavily discounted: Has been around for much longer (launched in May 2008).

If the count of individual advantages (bullet points above) is taken as a guide, the D3100 is the clear winner of the match-up (10 : 5 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision on a new camera. A professional 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 10:05 E-520

How about other alternatives? Do the specifications of the Nikon D3100 and the Olympus E-520 place the cameras among the top in their class? Find out in the latest Best DSLR 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 says little about, for example, the shooting experience and imaging performance of the D3100 and the E-520 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 why hands-on reviews by experts are important. The adjacent summary-table relays the overall verdicts of several of the most popular 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.
 
Nikon D31005/5+ +..72/1004.5/54.5/5 Aug 2010 599ebay.com
2.
 
Olympus E-520..87/100..+ +4.5/54.5/5 May 2008 699ebay.com
3.
 
Nikon D56004/5..4/579/1004.5/54/5 Nov 2016 699ebay.com
4.
 
Nikon D34004/5+4/576/1004/54.5/5 Aug 2016 499ebay.com
5.
 
Nikon D33003/5+..77/1004.5/54.5/5 Jan 2014 499ebay.com
6.
 
Nikon D32005/5+ +..73/1004.5/54.5/5 Apr 2012 599ebay.com
7.
 
Nikon D51005/5+ +..76/1004.5/54.5/5 Apr 2011 749ebay.com
8.
 
Nikon D3000..+..72/1004/54.5/5 Jul 2009 599ebay.com
9.
 
Nikon D5000..+ +..75/1004/54.5/5 Apr 2009 749ebay.com
10.
 
Nikon D60..80/100..+ +4/54.5/5 Jan 2008 629ebay.com
11.
 
Nikon D40X..79/100..+ +4/54/5 Mar 2007 729ebay.com
12.
 
Nikon D40..81/100..+ +o4.5/5 Nov 2006 499ebay.com
13.
 
Olympus E-600..........4.5/5 Aug 2009 449ebay.com
14.
 
Olympus E-6203/588/100..72/1004.5/55/5 Feb 2009 699ebay.com
15.
 
Olympus E-420..85/100..+ +4/54.5/5 Mar 2008 599ebay.com
16.
 
Olympus E-410..86/100..+ +4/54.5/5 Mar 2007 699ebay.com
17.
 
Olympus E-510..89/100..+ +3.5/54.5/5 Mar 2007 799ebay.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 assessments were made in relation to similar cameras of the same technological generation. 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. 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 would like to check on the differences and similarities of other camera models, just use the search menu below. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.

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    Specifications: Nikon D3100 vs Olympus E-520

    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-520
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Nikon F mount lenses Four Thirds lenses
    Launch Date August 2010 May 2008
    Launch Price USD 599 USD 699
    Sensor Specs Nikon D3100 Olympus E-520
    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 10 Megapixels
    Image Resolution 4608 x 3072 pixels 3648 x 2736 pixels
    Pixel Pitch 5.01 μm 4.74 μm
    Pixel Density 3.98 MP/cm2 4.44 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability 1080/24p Video no Video
    ISO Setting 100 - 3,200 ISO 100 - 1,600 ISO
    ISO Boost 100 - 12,800 ISO no Enhancement
    Image Processor EXPEED 2 TruePic III
    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) 919 548
    Screen Specs Nikon D3100 Olympus E-520
    Viewfinder Type Optical viewfinder Optical viewfinder
    Viewfinder Field of View 95% 95%
    Viewfinder Magnification 0.53x 0.46x
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 2.7inch
    LCD Resolution 230k dots 215k dots
    LCD Attachment Fixed screen Fixed screen
    Shooting Specs Nikon D3100 Olympus E-520
    Focus System Phase-detect AF Phase-detect AF
    Continuous Shooting 3 shutter flaps/s 3.5 shutter flaps/s
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Built-in Flash Built-in Flash
    Storage Medium SDXC cards CF or XD cards
    Single or Dual Card Slots Single card slot Dual card slots
    Connectivity Specs Nikon D3100 Olympus E-520
    External Flash Hotshoe Hotshoe
    USB Connector USB 2.0 USB 2.0
    HDMI Port mini HDMI no HDMI
    Wifi Support no Wifi no Wifi
    Body Specs Nikon D3100 Olympus E-520
    Battery Type Nikon EN-EL14 Olympus BLM-1
    Battery Life (CIPA)550 shots per charge750 shots per charge
    Body Dimensions 124 x 96 x 75 mm
    (4.9 x 3.8 x 3.0 in)
    136 x 92 x 68 mm
    (5.4 x 3.6 x 2.7 in)
    Camera Weight 505 g (17.8 oz) 535 g (18.9 oz)
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