Canon 400D vs Nikon D3100

The Canon EOS 400D (called Canon XTi in some regions) and the Nikon D3100 are two digital cameras that were revealed to the public, respectively, in August 2006 and August 2010. Both are DSLR (Digital Single Lens Reflex) cameras that are equipped with an APS-C sensor. The Canon has a resolution of 10.1 megapixels, whereas the Nikon provides 14.2 MP.

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

Headline Specifications

Canon 400D		Nikon D3100
Digital single lens reflex		Digital single lens reflex
Canon EF mount lenses		Nikon F mount lenses
10.1 MP – APS-C sensor		14.2 MP – APS-C sensor
no Video		1080/24p Video
ISO 100-1,600		ISO 100-3,200 (100 - 12,800)
Optical viewfinder		Optical viewfinder
2.5" 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
370 shots per battery charge		550 shots per battery charge
127 x 84 x 65 mm, 556 g		124 x 96 x 75 mm, 505 g

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Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 400D and the Nikon D3100? 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 Canon 400D and the Nikon D3100 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 400D is only available in black.

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Nikon D3100 is notably larger (12 percent) than the Canon 400D. However, the D3100 is markedly lighter (9 percent) than the 400D. In this context, it is worth noting that neither the 400D nor the D3100 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. Yet, since both cameras are based around an APS-C sensor, their respective lenses will tend to have similar dimensions and heft. You can compare the optics available for the two cameras in the Canon EF Lens Catalog (400D) and the Nikon Lens Catalog (D3100).

Concerning battery life, the 400D gets 370 shots out of its Canon NB-2LH battery, while the D3100 can take 550 images on a single charge of its Nikon EN-EL14 power pack.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.

Body Specifications

		Camera Model	Camera Width	Camera Height	Camera Depth	Camera Weight	Battery Life	Weather Sealing	Camera Launch	Launch Price	Street Price
1.		Canon 400D	127 mm	84 mm	65 mm	556 g	370	n	Aug 2006	US$ 799	ebay.com
2.		Nikon D3100	124 mm	96 mm	75 mm	505 g	550	n	Aug 2010	US$ 599	ebay.com
3.		Canon 40D	146 mm	108 mm	74 mm	822 g	750	n	Aug 2007	US$ 1 299	ebay.com
4.		Canon 350D	127 mm	94 mm	64 mm	540 g	400	n	Feb 2005	US$ 899	ebay.com
5.		Canon 450D	129 mm	98 mm	62 mm	524 g	500	n	Jan 2008	US$ 799	ebay.com
6.		Canon 500D	129 mm	98 mm	62 mm	520 g	400	n	Mar 2009	US$ 799	ebay.com
7.		Canon 550D	129 mm	98 mm	62 mm	530 g	440	n	Feb 2010	US$ 699	ebay.com
8.		Canon 650D	133 mm	100 mm	79 mm	575 g	440	n	Jun 2012	US$ 849	ebay.com
9.		Canon 750D	132 mm	101 mm	78 mm	555 g	440	n	Feb 2015	US$ 749	ebay.com
10.		Canon 760D	132 mm	101 mm	78 mm	565 g	440	n	Feb 2015	US$ 649	ebay.com
11.		Canon 1100D	130 mm	100 mm	78 mm	495 g	700	n	Feb 2011	US$ 449	ebay.com
12.		Nikon D40	124 mm	94 mm	64 mm	522 g	470	n	Nov 2006	US$ 499	ebay.com
13.		Nikon D40X	124 mm	94 mm	64 mm	522 g	520	n	Mar 2007	US$ 729	ebay.com
14.		Nikon D3000	126 mm	97 mm	64 mm	536 g	500	n	Jul 2009	US$ 599	ebay.com
15.		Nikon D3200	125 mm	96 mm	77 mm	505 g	540	n	Apr 2012	US$ 599	ebay.com
16.		Nikon D5000	127 mm	104 mm	80 mm	590 g	510	n	Apr 2009	US$ 749	ebay.com
17.		Nikon D5100	128 mm	97 mm	79 mm	560 g	660	n	Apr 2011	US$ 749	ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
Convert to Imperial

Any camera decision will obviously take relative prices into account. 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 D3100 was launched at a somewhat lower price (by 25 percent) than the 400D, which makes it more attractive for photographers on a tight budget. 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.

Sensor comparison

The size of the imaging sensor is a crucial determinant of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units 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 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 D3100 is 8 percent bigger. As a result of these sensor size differences, the cameras have format factors, respectively, of 1.6 (400D) and 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

With 14.2MP, the D3100 offers a higher resolution than the 400D (10.1MP), but the D3100 has smaller individual pixels (pixel pitch of 5.01μm versus 5.71μm for the 400D). Yet, the D3100 is a much more recent model (by 3 years and 11 months) than the 400D, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units.

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 Canon 400D are 19.4 x 13 inches or 49.4 x 32.9 cm for good quality, 15.6 x 10.4 inches or 39.5 x 26.3 cm for very good quality, and 13 x 8.6 inches or 32.9 x 21.9 cm for excellent quality prints.

The Canon EOS 400D has a native sensitivity range from ISO 100 to ISO 1600. The corresponding ISO settings for the Nikon D3100 are ISO 100 to ISO 3200, with the possibility to increase the ISO range to 100-12800.

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.

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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 consideration, the D3100 has a markedly higher DXO score than the 400D (overall score 5 points higher), which will translate into better image quality. The advantage is based on 0.4 bits higher color depth, 0.3 EV in additional dynamic range, and 0.5 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.

Sensor Characteristics

		Camera Model	Sensor Class	Resolution (MP)	Horiz. Pixels	Vert. Pixels	Video Format	DXO Portrait	DXO Landscape	DXO Sports	DXO Overall
1.		Canon 400D	APS-C	10.1	3888	2592	none	22.1	11.0	664	62
2.		Nikon D3100	APS-C	14.2	4608	3072	1080/24p	22.5	11.3	919	67
3.		Canon 40D	APS-C	10.1	3888	2592	none	22.1	11.3	703	64
4.		Canon 350D	APS-C	8.0	3456	2304	none	21.8	10.8	637	60
5.		Canon 450D	APS-C	12.2	4272	2848	none	21.9	10.8	692	61
6.		Canon 500D	APS-C	15.1	4752	3168	1080/20p	21.7	11.5	663	63
7.		Canon 550D	APS-C	17.9	5184	3456	1080/30p	22.1	11.5	784	66
8.		Canon 650D	APS-C	17.9	5184	3456	1080/30p	21.7	11.2	722	62
9.		Canon 750D	APS-C	24.0	6000	4000	1080/30p	22.7	12.0	919	71
10.		Canon 760D	APS-C	24.0	6000	4000	1080/30p	22.6	12.0	915	70
11.		Canon 1100D	APS-C	12.2	4272	2848	720/30p	21.9	11.0	755	62
12.		Nikon D40	APS-C	6.0	3008	2000	none	21.0	11.0	561	56
13.		Nikon D40X	APS-C	10.0	3872	2592	none	22.4	11.4	516	63
14.		Nikon D3000	APS-C	10.0	3872	2592	none	22.3	11.1	563	62
15.		Nikon D3200	APS-C	24.1	6016	4000	1080/30p	24.1	13.2	1131	81
16.		Nikon D5000	APS-C	12.2	4288	2848	720/24p	22.7	12.5	868	72
17.		Nikon D5100	APS-C	16.1	4928	3264	1080/30p	23.5	13.6	1183	80

Many modern cameras are not only capable of taking still images, but can also record movies. The D3100 indeed provides for movie recording, while the 400D does not. The highest resolution format that the D3100 can use is 1080/24p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. The 400D and the D3100 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 400D (0.53x vs 0.49x), 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 Canon 400D and Nikon D3100 along with similar information for a selection of comparators.

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.		Canon 400D	optical	n	2.5 / 230	fixed	n	1/4000s	3.0/s	Y	n
2.		Nikon D3100	optical	n	3.0 / 230	fixed	n	1/4000s	3.0/s	Y	n
3.		Canon 40D	optical	Y	3.0 / 230	fixed	n	1/8000s	6.5/s	Y	n
4.		Canon 350D	optical	n	1.8 / 115	fixed	n	1/4000s	3.0/s	Y	n
5.		Canon 450D	optical	n	3.0 / 230	fixed	n	1/4000s	3.5/s	Y	n
6.		Canon 500D	optical	n	3.0 / 920	fixed	n	1/4000s	3.4/s	Y	n
7.		Canon 550D	optical	n	3.0 / 1040	fixed	n	1/4000s	3.7/s	Y	n
8.		Canon 650D	optical	n	3.0 / 1040	swivel	Y	1/4000s	5.0/s	Y	n
9.		Canon 750D	optical	n	3.0 / 1040	swivel	Y	1/4000s	5.0/s	Y	n
10.		Canon 760D	optical	Y	3.0 / 1040	swivel	Y	1/4000s	5.0/s	Y	n
11.		Canon 1100D	optical	n	2.7 / 230	fixed	n	1/4000s	3.0/s	Y	n
12.		Nikon D40	optical	n	2.5 / 230	fixed	n	1/4000s	2.5/s	Y	n
13.		Nikon D40X	optical	n	2.5 / 230	fixed	n	1/4000s	3.0/s	Y	n
14.		Nikon D3000	optical	n	3.0 / 230	fixed	n	1/4000s	3.0/s	Y	n
15.		Nikon D3200	optical	n	3.0 / 921	fixed	n	1/4000s	4.0/s	Y	n
16.		Nikon D5000	optical	n	2.7 / 230	full-flex	n	1/4000s	4.0/s	Y	n
17.		Nikon D5100	optical	n	3.0 / 921	swivel	n	1/4000s	4.0/s	Y	n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

The 400D writes its imaging data to Compact Flash cards, while the D3100 uses SDXC 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 Canon EOS 400D and Nikon D3100 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 Mic / Speaker	Microphone Port	Headphone Port	HDMI Port	USB Port	WiFi Support	NFC Support	Bluetooth Support
1.		Canon 400D	Y	- / -	-	-	-	2.0	-	-	-
2.		Nikon D3100	Y	mono / mono	-	-	mini	2.0	-	-	-
3.		Canon 40D	Y	- / -	-	-	-	2.0	-	-	-
4.		Canon 350D	Y	- / -	-	-	-	2.0	-	-	-
5.		Canon 450D	Y	- / -	-	-	mini	2.0	-	-	-
6.		Canon 500D	Y	mono / mono	-	-	mini	2.0	-	-	-
7.		Canon 550D	Y	stereo / -	Y	-	mini	2.0	-	-	-
8.		Canon 650D	Y	stereo / mono	Y	-	mini	2.0	-	-	-
9.		Canon 750D	Y	stereo / mono	Y	-	mini	2.0	Y	Y	-
10.		Canon 760D	Y	stereo / mono	Y	-	mini	2.0	Y	Y	-
11.		Canon 1100D	Y	stereo / mono	-	-	mini	2.0	-	-	-
12.		Nikon D40	Y	- / -	-	-	-	2.0	-	-	-
13.		Nikon D40X	Y	- / -	-	-	-	2.0	-	-	-
14.		Nikon D3000	Y	- / -	-	-	-	2.0	-	-	-
15.		Nikon D3200	Y	mono / mono	Y	-	mini	2.0	-	-	-
16.		Nikon D5000	Y	mono / mono	-	-	mini	2.0	-	-	-
17.		Nikon D5100	Y	mono / mono	Y	-	mini	2.0	-	-	-

Both the 400D and the D3100 have been discontinued, but can regularly be found used on ebay. The 400D was replaced by the Canon 450D, while the D3100 was followed by the Nikon D3200. Further information on the features and operation of the 400D and D3100 can be found, respectively, in the Canon 400D Manual (free pdf) or the online Nikon D3100 Manual.

Review summary

So what is the bottom line? Which of the two cameras – the Canon 400D or the Nikon D3100 – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.

Advantages of the Canon EOS 400D:

• More heavily discounted: Has been available for much longer (launched in August 2006).

Arguments in favor of the Nikon D3100:

• More detail: Has more megapixels (14.2 vs 10.1MP), which boosts linear resolution by 19%.
• Better image quality: Scores markedly higher (5 points) in the DXO overall evaluation.
• Better low-light sensitivity: Can shoot in dim conditions (0.5 stops ISO advantage).
• Broader imaging potential: Can capture not only stills but also 1080/24p video.
• Larger viewfinder image: Features a viewfinder with a higher magnification (0.53x vs 0.49x).
• Larger screen: Has a bigger rear LCD (3.0" vs 2.5") for image review and settings control.
• Longer lasting: Gets more shots (550 versus 370) out of a single battery charge.
• More affordable: Was released into a lower priced segment (25 percent cheaper at launch).
• More modern: Reflects 3 years and 11 months of technical progress since the 400D launch.

If the count of individual advantages (bullet points above) is taken as a guide, the D3100 is the clear winner of the contest (9 : 1 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 sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

How about other alternatives? Do the specifications of the Canon 400D and the Nikon D3100 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 comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the 400D or the D3100. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable.

Expert reviews

This is why expert reviews 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.

Expert Camera Reviews

		Camera   Model	AP   score	CL   score	DCW   score	DPR   score	EPZ   score	PB   score	Camera Launch	Launch Price	Street Price
1.		Canon 400D	..	+ +	..	+ +	o	4/5	Aug 2006	US$ 799	ebay.com
2.		Nikon D3100	5/5	+ +	..	72/100	4.5/5	4.5/5	Aug 2010	US$ 599	ebay.com
3.		Canon 40D	..	+ +	..	+ +	4.5/5	4.5/5	Aug 2007	US$ 1 299	ebay.com
4.		Canon 350D	..	80/100	..	+ +	o	..	Feb 2005	US$ 899	ebay.com
5.		Canon 450D	..	+ +	..	+ +	4/5	4.5/5	Jan 2008	US$ 799	ebay.com
6.		Canon 500D	..	+ +	..	74/100	4.5/5	4.5/5	Mar 2009	US$ 799	ebay.com
7.		Canon 550D	..	+ +	..	77/100	4/5	4.5/5	Feb 2010	US$ 699	ebay.com
8.		Canon 650D	4/5	+ +	..	77/100	4.5/5	4.5/5	Jun 2012	US$ 849	ebay.com
9.		Canon 750D	5/5	..	..	75/100	4.5/5	4.5/5	Feb 2015	US$ 749	ebay.com
10.		Canon 760D	5/5	+	..	77/100	4.5/5	4.5/5	Feb 2015	US$ 649	ebay.com
11.		Canon 1100D	..	80/100	..	69/100	4/5	4.5/5	Feb 2011	US$ 449	ebay.com
12.		Nikon D40	..	81/100	..	+ +	o	4.5/5	Nov 2006	US$ 499	ebay.com
13.		Nikon D40X	..	79/100	..	+ +	4/5	4/5	Mar 2007	US$ 729	ebay.com
14.		Nikon D3000	..	+	..	72/100	4/5	4.5/5	Jul 2009	US$ 599	ebay.com
15.		Nikon D3200	5/5	+ +	..	73/100	4.5/5	4.5/5	Apr 2012	US$ 599	ebay.com
16.		Nikon D5000	..	+ +	..	75/100	4/5	4.5/5	Apr 2009	US$ 749	ebay.com
17.		Nikon D5100	5/5	+ +	..	76/100	4.5/5	4.5/5	Apr 2011	US$ 749	ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The review scores listed above should be treated with care, though. The ratings are only valid when referring to cameras in the same category and of the same age. Thus, a score needs to be put into the context of the launch date and the launch price 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 are interested in seeing how other cameras pair up, just make a corresponding selection in the search boxes 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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