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Nikon D3100 versus Nikon D7000

The Nikon D3100 and the Nikon D7000 are two digital cameras that were revealed to the public, respectively, in August 2010 and September 2010. Both are DSLR (Digital Single Lens Reflex) cameras that are equipped with an APS-C sensor. The D3100 has a resolution of 14.2 megapixel, whereas the D7000 provides 16.1 MP. Read on to find out how these two cameras compare with respect to their size, their sensors, their features, and their reception by expert reviewers.

Body comparison: Nikon D3100 vs Nikon D7000

An illustration of the physical size and weight of the Nikon D3100 and the Nikon D7000 is provided in the side-by-side display below. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth measures are rounded to the nearest millimeter. If you prefer, you can also use the toggle button to switch to a comparison in percentage terms (in this case, the camera on the left – the D3100 – represents 100 percent across all the size and weight measures).

Compare Nikon D3100 vs Nikon D7000
D3100 versus D7000 top view
D3100 and D7000 rear side
Body view (D3100 on the left)

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Nikon D7000 is notably larger (16 percent) than the Nikon D3100. Moreover, the D7000 is substantially heavier (54 percent) than the D3100. It is noteworthy in this context that the D7000 is splash and dust-proof, while the D3100 does not feature any corresponding weather-sealing.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. In this particular case, both cameras feature the same lens mount, so that they can use the same lenses. You can find an overview of suitable optics in the Nikon Lens Catalog.

Concerning battery life, the D3100 gets 550 shots out of its EN-EL14 battery, while the D7000 can take 1050 images on a single charge of its EN-EL15 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, 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 Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(y/n)
Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Nikon D3100 (⇒ rgt) 124 mm 96 mm 75 mm 505 g 550 no 2010 599discont. check
Nikon D7000 (⇒ lft) 132 mm 105 mm 77 mm 780 g 1050 YES 2010 1,499discont. check
Nikon D7500 (⇒ lft | rgt) 136 mm 104 mm 73 mm 720 g 950 YES 2017 1,299 latest check
Nikon D3400 (⇒ lft | rgt) 124 mm 98 mm 76 mm 445 g 1200 no 2016 499 latest check
Nikon D5600 (⇒ lft | rgt) 124 mm 97 mm 70 mm 465 g 970 no 2016 699 latest check
Nikon D3300 (⇒ lft | rgt) 124 mm 98 mm 76 mm 430 g 700 no 2014 499discont. check
Nikon D7100 (⇒ lft | rgt) 136 mm 107 mm 76 mm 765 g 950 YES 2013 1,199discont. check
Nikon Df (⇒ lft | rgt) 144 mm 110 mm 67 mm 760 g 1400 YES 2013 2,749 latest check
Nikon D3200 (⇒ lft | rgt) 125 mm 96 mm 77 mm 505 g 540 no 2012 599discont. check
Nikon D5100 (⇒ lft | rgt) 128 mm 97 mm 79 mm 560 g 660 no 2011 749discont. check
Nikon D300S (⇒ lft | rgt) 147 mm 115 mm 81 mm 938 g 950 YES 2009 1,799discont. check
Nikon D3000 (⇒ lft | rgt) 126 mm 97 mm 64 mm 536 g 500 no 2009 599discont. check
Nikon D5000 (⇒ lft | rgt) 127 mm 104 mm 80 mm 590 g 510 no 2009 749discont. check
Nikon D90 (⇒ lft | rgt) 132 mm 103 mm 77 mm 703 g 850 no 2008 1,299discont. check
Nikon D60 (⇒ lft | rgt) 126 mm 94 mm 64 mm 522 g 500 no 2008 629discont. check
Nikon D40X (⇒ lft | rgt) 124 mm 94 mm 64 mm 522 g 520 no 2007 729discont. check
Nikon D40 (⇒ lft | rgt) 124 mm 94 mm 64 mm 522 g 470 no 2006 499discont. check

The price is, of course, an important factor in any camera decision. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The D3100 was launched at a markedly lower price (by 60 percent) than the D7000, 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. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.


Sensor comparison: Nikon D3100 vs Nikon D7000

The size of the imaging sensor is a crucial determinant 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. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Both cameras under consideration feature an APS-C sensor, but their sensors differ slightly in size. The sensor area in the D7000 is 4 percent bigger. They nevertheless have the same format factor of 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Nikon D3100 and Nikon D7000 sensor measures
Sensor size

With 16.1MP, the D7000 offers a higher resolution than the D3100 (14.2MP), but the D7000 has smaller individual pixels (pixel pitch of 4.80μm versus 5.01μm for the D3100). It is noteworthy in this context that the two cameras were released in close succession, so that their sensors are from the same technological generation.

D3100 versus D7000 MP
Sensor resolution

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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 consideration, the D7000 offers substantially better image quality than the D3100 (overall score 13 points higher). The advantage is based on 1 bits higher color depth, 2.6 EV in additional dynamic range, and 0.3 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.

Sensor Characteristics
Camera Sensor
Class
Resolution
(Megapixel)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Nikon D3100 (⇒ rgt) APS-C 14.2 4608 3072 1080/24p 22.5 11.3 919 67
Nikon D7000 (⇒ lft) APS-C 16.1 4928 3264 10800/24p 23.5 13.9 1167 80
Nikon D7500 (⇒ lft | rgt) APS-C 20.7 5568 3712 4K/30p 24.3 14.0 1483 86
Nikon D3400 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 24.8 13.9 1192 86
Nikon D5600 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 24.1 14.0 1306 84
Nikon D3300 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 24.3 12.8 1385 82
Nikon D7100 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 24.2 13.7 1256 83
Nikon Df (⇒ lft | rgt) Full Frame 16.2 4928 3280 no 24.6 13.1 3279 89
Nikon D3200 (⇒ lft | rgt) APS-C 24.1 6016 4000 1080/30p 24.1 13.2 1131 81
Nikon D5100 (⇒ lft | rgt) APS-C 16.1 4928 3264 1080/30p 23.5 13.6 1183 80
Nikon D300S (⇒ lft | rgt) APS-C 12.2 4288 2848 720/24p 22.5 12.2 787 70
Nikon D3000 (⇒ lft | rgt) APS-C 10.0 3872 2592 no 22.3 11.1 563 62
Nikon D5000 (⇒ lft | rgt) APS-C 12.2 4288 2848 720/24p 22.7 12.5 868 72
Nikon D90 (⇒ lft | rgt) APS-C 12.2 4288 2848 720/24p 22.7 12.5 977 73
Nikon D60 (⇒ lft | rgt) APS-C 10.0 3872 2592 no 22.5 11.4 562 65
Nikon D40X (⇒ lft | rgt) APS-C 10.0 3872 2592 no 22.4 11.4 516 63
Nikon D40 (⇒ lft | rgt) APS-C 6.0 3008 2000 no 21 11.0 561 56

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, and both provide the same movie specifications (1080/24p).

Feature comparison: Nikon D3100 vs Nikon D7000

Beyond body and sensor, cameras can and do differ across a range of features. The D3100 and the D7000 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 following table reports on some other key feature differences and similarities of the Nikon D3100, the Nikon D7000, and comparable cameras. The full specs-sheets can be found in the camera manual or, for example, in the dpreview camera hub.

Core Features
Camera Viewfinder
(Type or
'000 dots)
Control
Panel
(Y/n)
LCD
Size
(inch)
LCD
Resolution
('000 dots)
LCD
Attach-
ment
Touch
Screen
(Y/n)
Shutter
speed
(1/sec)
Shutter
flaps
(1/sec))
Build-in
Flash
(GN)
Build-in
Image
Stab
Nikon D3100 (⇒ rgt) optical no 3.0 230 fixed no 4000 3.0 12 no
Nikon D7000 (⇒ lft) optical YES 3.0 921 fixed no 8000 6.0 12 no
Nikon D7500 (⇒ lft | rgt) optical YES 3.2 922 tilting YES 8000 8.0 12 no
Nikon D3400 (⇒ lft | rgt) optical no 3.0 921 fixed no 4000 5.0 7 no
Nikon D5600 (⇒ lft | rgt) optical no 3.2 1037 swivel YES 4000 5.0 12 no
Nikon D3300 (⇒ lft | rgt) optical no 3.0 921 fixed no 4000 5.0 12 no
Nikon D7100 (⇒ lft | rgt) optical YES 3.2 1229 fixed no 8000 6.0 12 no
Nikon Df (⇒ lft | rgt) optical YES 3.2 921 fixed no 4000 5.5 no no
Nikon D3200 (⇒ lft | rgt) optical no 3.0 921 fixed no 4000 4.0 12 no
Nikon D5100 (⇒ lft | rgt) optical no 3.0 921 swivel no 4000 4.0 12 no
Nikon D300S (⇒ lft | rgt) optical YES 3.0 920 fixed no 8000 7.0 12 no
Nikon D3000 (⇒ lft | rgt) optical no 3.0 230 fixed no 4000 3.0 12 no
Nikon D5000 (⇒ lft | rgt) optical no 2.7 230 full-flex no 4000 4.0 17 no
Nikon D90 (⇒ lft | rgt) optical YES 3.0 920 fixed no 4000 4.5 17 no
Nikon D60 (⇒ lft | rgt) optical no 2.5 230 fixed no 4000 3.0 12 no
Nikon D40X (⇒ lft | rgt) optical no 2.5 230 fixed no 4000 3.0 17 no
Nikon D40 (⇒ lft | rgt) optical no 2.5 230 fixed no 4000 2.5 17 no

Both the D3100 and the D7000 have been discontinued, but can regularly be found used on eBay. The D3100 was replaced by the Nikon D3200, while the D7000 was followed by the Nikon D7100.

Review summary: Nikon D3100 vs Nikon D7000

So what is the bottom line? Is the Nikon D3100 better than the Nikon D7000 or vice versa? Below is a summary of the relative strengths of each of the two contestants.


Reasons to prefer the Nikon D3100:

  • More compact: Is smaller (124x96mm vs 132x105mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 275g or 35 percent) and hence easier to carry around.
  • More affordable: Was introduced into a lower priced category (60 percent cheaper at launch).

Arguments in favor of the Nikon D7000:

  • More detail: Has more megapixels (16.1 vs 14.2MP), which boosts linear resolution by 7%.
  • Better image quality: Scores substantially higher (13 points) in the DXO overall evaluation.
  • More dynamic range: Captures a broader range of light and dark details (2.6 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (0.3 stops ISO advantage).
  • Easier setting verification: Has a control panel on top to check shooting parameters.
  • More detailed LCD: Has a higher resolution rear screen (921k vs 230k dots).
  • Faster shutter: Has higher mechanical shutter speed (8000/sec vs 4000/sec) to freeze action.
  • Faster burst: Shoots at higher frequency (6 vs 3 flaps/sec) to capture the decisive moment.
  • Longer lasting: Gets more shots (1050 versus 550) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.

If the count of relative strengths (bullet points above) is taken as a measure, the D7000 is the clear winner of the contest (10 : 3 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.

D3100 03:10 D7000

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it says nothing about, for example, the handling, responsiveness, and overall imaging quality of the D3100 and the D7000 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. This is why expert reviews are important. The table below summarizes the assessments of some of the best known camera review sites. You can find the full text of the reviews, respectively, at cameralabs.com, dpreview.com, ephotozine.com, imaging-resource.com, and photographyblog.com.

Review scores
Camera camera
labs
.com
dp
review
.com
ephoto
zine
.com
imaging
resource
.com
photography
blog
.com
Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Nikon D3100 (⇒ rgt) 84/100 HiRec 72/100 Silver 4.5/5 5/5 4.5/5 2010 599discont. check
Nikon D7000 (⇒ lft) - 80/100 Silver 4.5/5 5/5 4.5/5 2010 1,499discont. check
Nikon D7500 (⇒ lft | rgt) HiRec 86/100 Silver 5/5 4.5/5 4.5/5 2017 1,299 latest check
Nikon D3400 (⇒ lft | rgt) Rec 76/100 4/5 4.5/5 4.5/5 2016 499 latest check
Nikon D5600 (⇒ lft | rgt) - 79/100 Silver 4.5/5 4.5/5 4/5 2016 699 latest check
Nikon D3300 (⇒ lft | rgt) Rec 77/100 Silver 4.5/5 4.5/5 4.5/5 2014 499discont. check
Nikon D7100 (⇒ lft | rgt) HiRec 85/100 Gold 4.5/5 5/5 4.5/5 2013 1,199discont. check
Nikon Df (⇒ lft | rgt) - 81/100 4/5 4/5 4/5 2013 2,749 latest check
Nikon D3200 (⇒ lft | rgt) HiRec 73/100 Silver 4.5/5 4.5/5 4.5/5 2012 599discont. check
Nikon D5100 (⇒ lft | rgt) 86/100 HiRec 76/100 Silver 4.5/5 5/5 4.5/5 2011 749discont. check
Nikon D300S (⇒ lft | rgt) 90/100 HiRec 82/100 HiRec 4/5 5/5 4.5/5 2009 1,799discont. check
Nikon D3000 (⇒ lft | rgt) 80/100 Rec 72/100 HiRec 4/5 3.5/5 4.5/5 2009 599discont. check
Nikon D5000 (⇒ lft | rgt) 88/100 HiRec 75/100 HiRec 4/5 5/5 4.5/5 2009 749discont. check
Nikon D90 (⇒ lft | rgt) 89/100 HiRec HiRec 4/5 5/5 4.5/5 2008 1,299discont. check
Nikon D60 (⇒ lft | rgt) 80/100 HiRec 4/5 reviewed 4.5/5 2008 629discont. check
Nikon D40X (⇒ lft | rgt) 79/100 HiRec 4/5 reviewed 4/5 2007 729discont. check
Nikon D40 (⇒ lft | rgt) 81/100 HiRec reviewed 5/5 4.5/5 2006 499discont. check

The above review scores should be interpreted with care, though. The ratings are only valid when refering to cameras in the same category and of the same age. A score, therefore, has to be seen in close connection to the price and market introduction time 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.


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. If you do not see the camera that you are looking for, kindly get in touch, and I will try to add information on that model to the database.

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