Nikon D40 vs Sony NEX-3

The Nikon D40 and the Sony Alpha NEX-3 are two digital cameras that were revealed to the public, respectively, in November 2006 and May 2010. The D40 is a DSLR, while the NEX-3 is a mirrorless interchangeable lens camera. Both cameras are equipped with an APS-C sensor. The Nikon has a resolution of 6 megapixels, whereas the Sony provides 14 MP.

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

Headline Specifications

Nikon D40		Sony NEX-3
Digital single lens reflex		Mirrorless system camera
Nikon F mount lenses		Sony E mount lenses
6 MP – APS-C sensor		14 MP – APS-C sensor
no Video		720/30p Video
ISO 200-1,600 (200 - 3,200)		ISO 200-12,800
Optical viewfinder		Viewfinder optional
2.5" LCD – 230k dots		3.0" LCD – 920k dots
Fixed screen (not touch-sensitive)		Tilting screen (no touchscreen)
2.5 shutter flaps per second		7 shutter flaps per second
470 shots per battery charge		330 shots per battery charge
124 x 94 x 64 mm, 522 g		117 x 62 x 33 mm, 297 g

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Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D40 and the Sony Alpha NEX-3? 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 D40 and the Sony NEX-3. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All width, height and depth measures are rounded to the nearest millimeter.

The NEX-3 can be obtained in three different colors (black, silver, red), while the D40 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 Sony NEX-3 is considerably smaller (38 percent) than the Nikon D40. Moreover, the NEX-3 is substantially lighter (43 percent) than the D40. In this context, it is worth noting that neither the D40 nor the NEX-3 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. Both cameras have similarly sized sensors, but DSLRs have a larger flange-to-focal plane distance than mirrorless cameras, which imposes contraints on the optical engineering process and generally leads to bigger and heavier lenses. You can compare the optics available for the two cameras in the Nikon Lens Catalog (D40) and the Sony E-Mount Lens Catalog (NEX-3). Mirrorless cameras, such as the NEX-3, 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 D40 gets 470 shots out of its Nikon EN-EL9 battery, while the NEX-3 can take 330 images on a single charge of its Sony NP-FW50 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.

Body Specifications

		Camera Model	Camera Width	Camera Height	Camera Depth	Camera Weight	Battery Life	Weather Sealing	Camera Launch	Launch Price	Street Price
1.		Nikon D40	124 mm	94 mm	64 mm	522 g	470	n	Nov 2006	US$ 499	ebay.com
2.		Sony NEX-3	117 mm	62 mm	33 mm	297 g	330	n	May 2010	US$ 599	ebay.com
3.		Nikon D40X	124 mm	94 mm	64 mm	522 g	520	n	Mar 2007	US$ 729	ebay.com
4.		Nikon D50	133 mm	102 mm	76 mm	620 g	400	n	Apr 2005	US$ 749	ebay.com
5.		Nikon D70s	140 mm	111 mm	78 mm	679 g	500	n	Apr 2005	US$ 899	ebay.com
6.		Nikon D80	132 mm	103 mm	77 mm	668 g	600	n	Aug 2006	US$ 999	ebay.com
7.		Nikon D3000	126 mm	97 mm	64 mm	536 g	500	n	Jul 2009	US$ 599	ebay.com
8.		Nikon D3100	124 mm	96 mm	75 mm	505 g	550	n	Aug 2010	US$ 599	ebay.com
9.		Nikon D3200	125 mm	96 mm	77 mm	505 g	540	n	Apr 2012	US$ 599	ebay.com
10.		Nikon D3300	124 mm	98 mm	76 mm	430 g	700	n	Jan 2014	US$ 499	ebay.com
11.		Nikon D3400	124 mm	98 mm	76 mm	445 g	1200	n	Aug 2016	US$ 499	ebay.com
12.		Panasonic L10	135 mm	96 mm	78 mm	556 g	450	n	Aug 2007	US$ 599	ebay.com
13.		Sony NEX-3N	110 mm	62 mm	35 mm	269 g	480	n	Feb 2013	US$ 499	ebay.com
14.		Sony NEX-5	111 mm	59 mm	38 mm	287 g	330	n	May 2010	US$ 699	ebay.com
15.		Sony NEX-5N	111 mm	59 mm	38 mm	269 g	460	n	Aug 2011	US$ 699	ebay.com
16.		Sony NEX-C3	110 mm	60 mm	33 mm	225 g	400	n	Jun 2011	US$ 599	ebay.com
17.		Sony NEX-F3	117 mm	67 mm	42 mm	314 g	470	n	May 2012	US$ 599	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

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 D40 was launched at a somewhat lower price (by 17 percent) than the NEX-3, 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. 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 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 NEX-3 is 1 percent smaller. 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.

Despite having a slightly smaller sensor, the NEX-3 offers a higher resolution of 14 megapixels, compared with 6 MP of the D40. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 5.11μm versus 7.85μm for the D40). However, it should be noted that the NEX-3 is much more recent (by 3 years and 5 months) than the D40, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently.

The resolution advantage of the Sony NEX-3 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the NEX-3 for good quality output (200 dots per inch) amounts to 23 x 15.3 inches or 58.3 x 38.8 cm, for very good quality (250 dpi) 18.4 x 12.2 inches or 46.7 x 31 cm, and for excellent quality (300 dpi) 15.3 x 10.2 inches or 38.9 x 25.9 cm. The corresponding values for the Nikon D40 are 15 x 10 inches or 38.2 x 25.4 cm for good quality, 12 x 8 inches or 30.6 x 20.3 cm for very good quality, and 10 x 6.7 inches or 25.5 x 16.9 cm for excellent quality prints.

The Nikon D40 has a native sensitivity range from ISO 200 to ISO 1600, which can be extended to ISO 200-3200. The corresponding ISO settings for the Sony Alpha NEX-3 are ISO 200 to ISO 12800 (no boost).

In terms of underlying technology, the D40 is build around a CCD sensor, while the NEX-3 uses a CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

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 consideration, the NEX-3 offers substantially better image quality than the D40 (overall score 12 points higher). The advantage is based on 1.1 bits higher color depth, 1 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.

Sensor Characteristics

		Camera Model	Sensor Class	Resolution (MP)	Horiz. Pixels	Vert. Pixels	Video Format	DXO Portrait	DXO Landscape	DXO Sports	DXO Overall
1.		Nikon D40	APS-C	6.0	3008	2000	none	21.0	11.0	561	56
2.		Sony NEX-3	APS-C	14.0	4592	3056	720/30p	22.1	12.0	830	68
3.		Nikon D40X	APS-C	10.0	3872	2592	none	22.4	11.4	516	63
4.		Nikon D50	APS-C	6.0	3008	2000	none	20.9	10.8	560	55
5.		Nikon D70s	APS-C	6.0	3008	2000	none	20.4	10.3	529	50
6.		Nikon D80	APS-C	10.0	3872	2592	none	22.1	11.2	524	61
7.		Nikon D3000	APS-C	10.0	3872	2592	none	22.3	11.1	563	62
8.		Nikon D3100	APS-C	14.2	4608	3072	1080/24p	22.5	11.3	919	67
9.		Nikon D3200	APS-C	24.1	6016	4000	1080/30p	24.1	13.2	1131	81
10.		Nikon D3300	APS-C	24.0	6000	4000	1080/60p	24.3	12.8	1385	82
11.		Nikon D3400	APS-C	24.0	6000	4000	1080/60p	24.8	13.9	1192	86
12.		Panasonic L10	Four Thirds	10.0	3648	2736	none	21.3	10.8	429	55
13.		Sony NEX-3N	APS-C	16.0	4912	3264	1080/60i	22.8	12.5	1067	74
14.		Sony NEX-5	APS-C	14.0	4592	3056	1080/60i	22.2	12.2	796	69
15.		Sony NEX-5N	APS-C	16.0	4912	3264	1080/60i	23.6	12.7	1079	77
16.		Sony NEX-C3	APS-C	16.0	4912	3264	720/30p	22.7	12.2	1083	73
17.		Sony NEX-F3	APS-C	16.0	4912	3264	1080/60i	22.7	12.3	1114	73

Many modern cameras cannot only take still pictures, but also record videos. The NEX-3 indeed provides for movie recording, while the D40 does not. The highest resolution format that the NEX-3 can use is 720/30p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the D40 has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the NEX-3 relies on live view and the rear LCD for framing. That said, the NEX-3 can be equipped with an optional viewfinder – the FDA-SV1. The table below summarizes some of the other core capabilities of the Nikon D40 and Sony NEX-3 in connection with corresponding information for a sample of similar cameras.

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 D40	optical	n	2.5 / 230	fixed	n	1/4000s	2.5/s	Y	n
2.		Sony NEX-3	optional	n	3.0 / 920	tilting	n	1/4000s	7.0/s	n	n
3.		Nikon D40X	optical	n	2.5 / 230	fixed	n	1/4000s	3.0/s	Y	n
4.		Nikon D50	optical	n	2.0 / 130	fixed	n	1/4000s	2.5/s	Y	n
5.		Nikon D70s	optical	n	2.0 / 130	fixed	n	1/8000s	3.0/s	Y	n
6.		Nikon D80	optical	n	2.5 / 230	fixed	n	1/4000s	3.0/s	Y	n
7.		Nikon D3000	optical	n	3.0 / 230	fixed	n	1/4000s	3.0/s	Y	n
8.		Nikon D3100	optical	n	3.0 / 230	fixed	n	1/4000s	3.0/s	Y	n
9.		Nikon D3200	optical	n	3.0 / 921	fixed	n	1/4000s	4.0/s	Y	n
10.		Nikon D3300	optical	n	3.0 / 921	fixed	n	1/4000s	5.0/s	Y	n
11.		Nikon D3400	optical	n	3.0 / 921	fixed	n	1/4000s	5.0/s	Y	n
12.		Panasonic L10	optical	n	2.5 / 207	swivel	n	1/4000s	3.0/s	Y	n
13.		Sony NEX-3N	optional	n	3.0 / 460	tilting	n	1/4000s	4.0/s	Y	n
14.		Sony NEX-5	optional	n	3.0 / 920	tilting	n	1/4000s	7.0/s	n	n
15.		Sony NEX-5N	optional	n	3.0 / 920	tilting	Y	1/4000s	10.0/s	n	n
16.		Sony NEX-C3	optional	n	3.0 / 920	tilting	n	1/4000s	5.5/s	n	n
17.		Sony NEX-F3	optional	n	3.0 / 920	tilting	n	1/4000s	5.5/s	Y	n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One difference between the cameras concerns the presence of an on-board flash. The D40 has one, while the NEX-3 does not. While the built-in flash of the D40 is not very powerful, it can at times be useful as a fill-in light.

The D40 writes its imaging data to SDHC cards, while the NEX-3 uses SDXC or Memory Stick PRO Duo 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 D40 and Sony Alpha NEX-3 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.		Nikon D40	Y	- / -	-	-	-	2.0	-	-	-
2.		Sony NEX-3	Y	stereo / mono	-	-	mini	2.0	-	-	-
3.		Nikon D40X	Y	- / -	-	-	-	2.0	-	-	-
4.		Nikon D50	Y	- / -	-	-	-	2.0	-	-	-
5.		Nikon D70s	Y	- / -	-	-	-	2.0	-	-	-
6.		Nikon D80	Y	- / -	-	-	-	2.0	-	-	-
7.		Nikon D3000	Y	- / -	-	-	-	2.0	-	-	-
8.		Nikon D3100	Y	mono / mono	-	-	mini	2.0	-	-	-
9.		Nikon D3200	Y	mono / mono	Y	-	mini	2.0	-	-	-
10.		Nikon D3300	Y	mono / mono	Y	-	mini	2.0	-	-	-
11.		Nikon D3400	Y	mono / mono	-	-	mini	2.0	-	-	Y
12.		Panasonic L10	Y	- / -	-	-	-	2.0	-	-	-
13.		Sony NEX-3N	-	stereo / mono	-	-	micro	2.0	-	-	-
14.		Sony NEX-5	Y	stereo / mono	-	-	mini	2.0	-	-	-
15.		Sony NEX-5N	Y	stereo / mono	-	-	mini	2.0	-	-	-
16.		Sony NEX-C3	Y	stereo / mono	-	-	mini	2.0	-	-	-
17.		Sony NEX-F3	Y	stereo / mono	-	-	mini	2.0	-	-	-

Both the D40 and the NEX-3 have been discontinued, but can regularly be found used on ebay. The D40 was replaced by the Nikon D40X, while the NEX-3 was followed by the Sony NEX-3N. Further information on the features and operation of the D40 and NEX-3 can be found, respectively, in the Nikon D40 Manual (free pdf) or the online Sony NEX-3 Manual.

Review summary

So what is the bottom line? Which of the two cameras – the Nikon D40 or the Sony NEX-3 – 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 Nikon D40:

• Easier framing: Has an optical viewfinder for image composition and settings control.
• Longer lasting: Can take more shots (470 versus 330) 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 (17 percent cheaper at launch).
• More heavily discounted: Has been available for much longer (launched in November 2006).

Reasons to prefer the Sony Alpha NEX-3:

• More detail: Has more megapixels (14 vs 6MP), which boosts linear resolution by 53%.
• Better image quality: Scores substantially higher (12 points) in the DXO overall evaluation.
• Richer colors: Generates noticeably more natural colors (1.1 bits more color depth).
• More dynamic range: Captures a broader range of light and dark details (1 EV of extra DR).
• Better low-light sensitivity: Can shoot in dim conditions (0.6 stops ISO advantage).
• Broader imaging potential: Can capture not only stills but also 720/30p video.
• Larger screen: Has a bigger rear LCD (3.0" vs 2.5") for image review and settings control.
• More detailed LCD: Has a higher resolution rear screen (920k vs 230k dots).
• More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
• More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
• Faster burst: Shoots at higher frequency (7 vs 2.5 flaps/sec) to capture the decisive moment.
• More compact: Is smaller (117x62mm vs 124x94mm) and will fit more readily into a bag.
• Less heavy: Has a lower weight (by 225g or 43 percent) and is thus easier to take along.
• More legacy lens friendly: Can use many non-native lenses via adapters.
• More modern: Reflects 3 years and 5 months of technical progress since the D40 launch.

If the count of individual advantages (bullet points above) is taken as a guide, the NEX-3 is the clear winner of the contest (15 : 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 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 Nikon D40 and the Sony NEX-3 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 remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the D40 or the NEX-3. 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 expert reviews are important. The following table reports the overall ratings of the cameras as published by some of the major 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.

Expert Camera Reviews

		Camera   Model	AP   score	CL   score	DCW   score	DPR   score	EPZ   score	PB   score	Camera Launch	Launch Price	Street Price
1.		Nikon D40	..	81/100	..	+ +	o	4.5/5	Nov 2006	US$ 499	ebay.com
2.		Sony NEX-3	..	..	..	70/100	4.5/5	4/5	May 2010	US$ 599	ebay.com
3.		Nikon D40X	..	79/100	..	+ +	4/5	4/5	Mar 2007	US$ 729	ebay.com
4.		Nikon D50	..	78/100	..	+ +	4/5	4.5/5	Apr 2005	US$ 749	ebay.com
5.		Nikon D70s	..	..	..	..	..	5/5	Apr 2005	US$ 899	ebay.com
6.		Nikon D80	..	+	..	+ +	o	4.5/5	Aug 2006	US$ 999	ebay.com
7.		Nikon D3000	..	+	..	72/100	4/5	4.5/5	Jul 2009	US$ 599	ebay.com
8.		Nikon D3100	5/5	+ +	..	72/100	4.5/5	4.5/5	Aug 2010	US$ 599	ebay.com
9.		Nikon D3200	5/5	+ +	..	73/100	4.5/5	4.5/5	Apr 2012	US$ 599	ebay.com
10.		Nikon D3300	3/5	+	..	77/100	4.5/5	4.5/5	Jan 2014	US$ 499	ebay.com
11.		Nikon D3400	4/5	+	4/5	76/100	4/5	4.5/5	Aug 2016	US$ 499	ebay.com
12.		Panasonic L10	..	85/100	..	+	3.5/5	4/5	Aug 2007	US$ 599	ebay.com
13.		Sony NEX-3N	3/5	..	..	..	4.5/5	4.5/5	Feb 2013	US$ 499	ebay.com
14.		Sony NEX-5	3/5	+ +	..	71/100	4.5/5	4/5	May 2010	US$ 699	ebay.com
15.		Sony NEX-5N	3/5	+ +	..	79/100	4.5/5	4.5/5	Aug 2011	US$ 699	ebay.com
16.		Sony NEX-C3	3/5	+ +	..	74/100	4.5/5	4/5	Jun 2011	US$ 599	ebay.com
17.		Sony NEX-F3	4/5	..	..	74/100	4.5/5	4.5/5	May 2012	US$ 599	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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