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Canon 40D vs Sony NEX-3

The Canon EOS 40D and the Sony Alpha NEX-3 are two digital cameras that were announced, respectively, in August 2007 and May 2010. The 40D is a DSLR, while the NEX-3 is a mirrorless interchangeable lens camera. Both cameras are equipped with an APS-C sensor. The Canon has a resolution of 10.1 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
Canon 40D
versus
Sony NEX-3
Canon 40D   Sony NEX-3
Digital single lens reflex Mirrorless system camera
Canon EF mount lenses Sony E mount lenses
10.1 MP, APS-C Sensor 14 MP, APS-C Sensor
no Video 720/30p Video
ISO 100-1,600 (100 - 3,200) ISO 200-12,800
Optical viewfinder Viewfinder optional
3.0 LCD, 230k dots 3.0 LCD, 920k dots
Fixed screen (not touch-sensitive) Tilting screen (not touch-sensitive)
6.5 shutter flaps per second 7 shutter flaps per second
750 shots per battery charge330 shots per battery charge
146 x 108 x 74 mm, 822 g 117 x 62 x 33 mm, 297 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 40D 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 physical size and weight of the Canon 40D and the Sony NEX-3 are illustrated 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 measures are rounded to the nearest millimeter.

The NEX-3 can be obtained in three different colors (black, silver, red), while the 40D is only available in black.

Size Canon 40D vs Sony NEX-3
Compare 40D versus NEX-3 top
Comparison 40D or NEX-3 rear

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 (54 percent) than the Canon 40D. Moreover, the NEX-3 is substantially lighter (64 percent) than the 40D. In this context, it is worth noting that neither the 40D 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 Canon EF Lens Catalog (40D) 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 40D gets 750 shots out of its BP-511A battery, while the NEX-3 can take 330 images on a single charge of its NP-FW50 power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. 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.

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Body Specifications
    Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Canon 40D 146 mm 108 mm 74 mm 822 g 750 n Aug 2007 1,299i
2.
 
Sony NEX-3 117 mm 62 mm 33 mm 297 g 330 n May 2010 599i
3.
 
Canon T3 130 mm 100 mm 78 mm 495 g 700 n Feb 2011 449i
4.
 
Canon 60D 145 mm 106 mm 79 mm 755 g 1100 Y Aug 2010 1,399i
5.
 
Canon 50D 146 mm 108 mm 74 mm 822 g 800 Y Aug 2008 1,299i
6.
 
Canon XS 126 mm 98 mm 65 mm 502 g 500 n Jun 2008 449i
7.
 
Canon XSi 129 mm 98 mm 62 mm 524 g 500 n Jan 2008 799i
8.
 
Canon 30D 144 mm 106 mm 74 mm 785 g 750 n Feb 2006 1,399i
9.
 
Canon XTi 127 mm 84 mm 65 mm 556 g 370 n Aug 2006 799i
10.
 
Canon 20D 144 mm 106 mm 72 mm 770 g 700 n Aug 2004 1,499i
11.
 
Canon 10D 150 mm 107 mm 75 mm 850 g 500 n Feb 2003 1,999i
12.
 
Nikon D90 132 mm 103 mm 77 mm 703 g 850 n Aug 2008 1,299i
13.
 
Sony A5100 110 mm 63 mm 36 mm 283 g 400 n Aug 2014 549 i
14.
 
Sony NEX-3N 110 mm 62 mm 35 mm 269 g 480 n Feb 2013 499i
15.
 
Sony NEX-5R 111 mm 59 mm 39 mm 276 g 330 n Aug 2012 749i
16.
 
Sony NEX-5N 111 mm 59 mm 38 mm 269 g 460 n Aug 2011 699i
17.
 
Sony NEX-5 111 mm 59 mm 38 mm 287 g 330 n May 2010 699i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

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 NEX-3 was launched at a markedly lower price (by 54 percent) than the 40D, which puts it into a different market segment. 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 sensor inside a digital camera is one of the key determinants 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. 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.

Both cameras under consideration feature an APS-C sensor, but their sensors differ slightly in size. The sensor area in the NEX-3 is 10 percent bigger. As a result of these sensor size differences, the cameras have format factors, respectively, of 1.6 (40D) and 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

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

Canon 40D and Sony NEX-3 sensor measures

With 14MP, the NEX-3 offers a higher resolution than the 40D (10.1MP), but the NEX-3 has smaller individual pixels (pixel pitch of 5.11μm versus 5.73μm for the 40D). Yet, the NEX-3 is a much more recent model (by 2 years and 8 months) than the 40D, 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 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 Canon 40D 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 40D has a native sensitivity range from ISO 100 to ISO 1600, which can be extended to ISO 100-3200. The corresponding ISO settings for the Sony Alpha NEX-3 are ISO 200 to ISO 12800 (no boost).

40D versus NEX-3 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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 NEX-3 has a markedly higher DXO score than the 40D (overall score 4 points higher), which will translate into better image quality. 0.7 EV in additional dynamic range, and 0.2 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.

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Sensor Characteristics
    Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Canon 40D APS-C 10.1 3888 2592none22.111.370364
2.
 
Sony NEX-3 APS-C 14.0 4592 3056720/30p22.112.083068
3.
 
Canon T3 APS-C 12.2 4272 2848720/30p21.911.075562
4.
 
Canon 60D APS-C 17.9 5184 34561080/30p22.211.581366
5.
 
Canon 50D APS-C 15.1 4752 3168none21.811.469663
6.
 
Canon XS APS-C 10.1 3888 2592none........
7.
 
Canon XSi APS-C 12.2 4272 2848none21.910.869261
8.
 
Canon 30D APS-C 8.2 3504 2336none21.510.873659
9.
 
Canon XTi APS-C 10.1 3888 2592none22.111.066462
10.
 
Canon 20D APS-C 8.2 3504 2336none21.911.072162
11.
 
Canon 10D APS-C 6.3 3072 2048none21.110.957157
12.
 
Nikon D90 APS-C 12.2 4288 2848720/24p22.712.597773
13.
 
Sony A5100 APS-C 24.0 6000 40001080/60p23.812.7134780
14.
 
Sony NEX-3N APS-C 16.0 4912 32641080/60i22.812.5106774
15.
 
Sony NEX-5R APS-C 16.0 4912 32641080/60i23.713.191078
16.
 
Sony NEX-5N APS-C 16.0 4912 32641080/60i23.612.7107977
17.
 
Sony NEX-5 APS-C 14.0 4592 30561080/60i22.212.279669

Many modern cameras are not only capable of taking still images, but also of capturing video footage. The NEX-3 indeed provides for movie recording, while the 40D 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 40D 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 following table reports on some other key feature differences and similarities of the Canon 40D, the Sony NEX-3, and comparable cameras.

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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)
Mech
Shutter
Speed
Shutter
Flaps
(1/sec)
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Canon 40Doptical Y3.0 / 230 fixed n 1/8000s 6.5 Y n
2.
 
Sony NEX-3optional n3.0 / 920 tilting n 1/4000s 7.0 n n
3.
 
Canon T3optical n2.7 / 230 fixed n 1/4000s 3.0 Y n
4.
 
Canon 60Doptical Y3.0 / 1040 swivel n 1/8000s 5.3 Y n
5.
 
Canon 50Doptical Y3.0 / 920 fixed n 1/8000s 6.3 Y n
6.
 
Canon XSoptical n2.5 / 230 fixed n 1/4000s 3.0 Y n
7.
 
Canon XSioptical n3.0 / 230 fixed n 1/4000s 3.5 Y n
8.
 
Canon 30Doptical Y2.5 / 230 fixed n 1/8000s 5.0 Y n
9.
 
Canon XTioptical n2.5 / 230 fixed n 1/4000s 3.0 Y n
10.
 
Canon 20Doptical Y1.8 / 118 fixed n 1/8000s 5.0 Y n
11.
 
Canon 10Doptical Y1.8 / 118 fixed n 1/4000s 3.0 Y n
12.
 
Nikon D90optical Y3.0 / 920 fixed n 1/4000s 4.5 Y n
13.
 
Sony A5100none n3.0 / 922 tilting Y 1/4000s 6.0 Y n
14.
 
Sony NEX-3Noptional n3.0 / 460 tilting n 1/4000s 4.0 Y n
15.
 
Sony NEX-5Roptional n3.0 / 920 tilting Y 1/4000s 10.0 n n
16.
 
Sony NEX-5Noptional n3.0 / 920 tilting Y 1/4000s 10.0 n n
17.
 
Sony NEX-5optional n3.0 / 920 tilting n 1/4000s 7.0 n n

One difference between the cameras concerns the presence of an on-board flash. The 40D has one, while the NEX-3 does not. While the built-in flash of the 40D is not very powerful, it can at times be useful as a fill-in light.

The NEX-3 has an articulated screen that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in taking selfies. In contrast, the 40D does not have a selfie-screen.

The 40D writes its imaging data to Compact Flash 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 Canon EOS 40D and Sony Alpha NEX-3 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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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 40DY- / ----2.0---
2.
 
Sony NEX-3Ystereo / mono--mini2.0---
3.
 
Canon T3Ystereo / mono--mini2.0---
4.
 
Canon 60DYmono / monoY-mini2.0---
5.
 
Canon 50DY- / ---mini2.0---
6.
 
Canon XSY- / ----2.0---
7.
 
Canon XSiY- / ---mini2.0---
8.
 
Canon 30DY- / ----2.0---
9.
 
Canon XTiY- / ----2.0---
10.
 
Canon 20DY- / ----1.1---
11.
 
Canon 10DY- / ----1.1---
12.
 
Nikon D90Ymono / mono--mini2.0---
13.
 
Sony A5100-stereo / mono--micro2.0YY-
14.
 
Sony NEX-3N-stereo / mono--micro2.0---
15.
 
Sony NEX-5RYstereo / mono--mini2.0Y--
16.
 
Sony NEX-5NYstereo / mono--mini2.0---
17.
 
Sony NEX-5Ystereo / mono--mini2.0---

Studio photographers will appreciate that the Canon 40D (unlike the NEX-3) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the 40D and the NEX-3 have been discontinued, but can regularly be found used on eBay. The 40D was replaced by the Canon 50D, while the NEX-3 was followed by the Sony NEX-3N. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon and Sony websites.

Review summary

So what is the bottom line? Is the Canon 40D better than the Sony NEX-3 or vice versa? Below is a summary of the relative strengths of each of the two contestants.

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Arguments in favor of the Canon EOS 40D:

  • Easier framing: Has an optical viewfinder for image composition and settings control.
  • Easier setting verification: Features an LCD display on top to control shooting parameters.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Longer lasting: Can take more shots (750 versus 330) on a single battery charge.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • More heavily discounted: Has been available for much longer (launched in August 2007).

ilogo

Reasons to prefer the Sony Alpha NEX-3:

  • More detail: Has more megapixels (14 vs 10.1MP), which boosts linear resolution by 18%.
  • Better image quality: Scores markedly higher (4 points) in the DXO overall evaluation.
  • More dynamic range: Captures a broader range of light and dark details (0.7 EV of extra DR).
  • Broader imaging potential: Can capture not only stills but also 720/30p video.
  • 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.
  • More compact: Is smaller (117x62mm vs 146x108mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 525g or 64 percent) and is thus easier to take along.
  • More legacy lens friendly: Can use many non-native lenses via adapters.
  • More affordable: Was introduced into a lower priced category (54 percent cheaper at launch).
  • More modern: Reflects 2 years and 8 months of technical progress since the 40D launch.

If the number of relative strengths (bullet points above) is taken as a guide, the NEX-3 is the clear winner of the contest (12 : 7 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 wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

40D 07:12 NEX-3

How about other alternatives? Do the specifications of the Canon 40D 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 specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains incomplete and does no justice, for example, to the way the 40D or the NEX-3 perform in practice. 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 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
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Canon 40D..+ +..+ +4.5/54.5/5 Aug 2007 1,299i
2.
 
Sony NEX-3......70/1004.5/54/5 May 2010 599i
3.
 
Canon T3..80/100..69/1004/54.5/5 Feb 2011 449i
4.
 
Canon 60D5/5+..79/1004/54.5/5 Aug 2010 1,399i
5.
 
Canon 50D..+ +..+ +4.5/54.5/5 Aug 2008 1,299i
6.
 
Canon XS..82/100..+ +3.5/54.5/5 Jun 2008 449i
7.
 
Canon XSi..+ +..+ +4/54.5/5 Jan 2008 799i
8.
 
Canon 30D..+ +..+ +o.. Feb 2006 1,399i
9.
 
Canon XTi..+ +..+ +o4/5 Aug 2006 799i
10.
 
Canon 20D......+ +.... Aug 2004 1,499i
11.
 
Canon 10D......+ +.... Feb 2003 1,999i
12.
 
Nikon D90..+ +..+ +4/54.5/5 Aug 2008 1,299i
13.
 
Sony A51004.5/5+....4.5/55/5 Aug 2014 549 i
14.
 
Sony NEX-3N3/5......4.5/54.5/5 Feb 2013 499i
15.
 
Sony NEX-5R........4.5/54.5/5 Aug 2012 749i
16.
 
Sony NEX-5N3/5+ +..79/1004.5/54.5/5 Aug 2011 699i
17.
 
Sony NEX-53/5+ +..71/1004.5/54/5 May 2010 699i
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. 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. Also, please note that some of the review sites have changed their methodology and reporting over time.

Canon 40D:
Check Ebay offers
Sony NEX-3:
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 make a corresponding selection in the search boxes 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: Canon 40D vs Sony NEX-3

    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 Canon 40D Sony NEX-3
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Canon EF mount lenses Sony E mount lenses
    Launch Date August 2007 May 2010
    Launch Price USD 1,299 USD 599
    Sensor Specs Canon 40D Sony NEX-3
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor APS-C Sensor
    Sensor Size 22.3 x 14.9 mm 23.4 x 15.6 mm
    Sensor Area 332.27 mm2 365.04 mm2
    Sensor Diagonal 26.8 mm 28.1 mm
    Crop Factor 1.6x 1.5x
    Sensor Resolution 10.1 Megapixels 14 Megapixels
    Image Resolution 3888 x 2592 pixels 4592 x 3056 pixels
    Pixel Pitch 5.73 μm 5.11 μm
    Pixel Density 3.03 MP/cm2 3.84 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability no Video 720/30p Video
    ISO Setting 100 - 1,600 ISO 200 - 12,800 ISO
    ISO Boost 100 - 3,200 ISO no Enhancement
    Image Processor DIGIC 3 BIONZ
    DXO Sensor Quality (score) 64 68
    DXO Color Depth (bits) 22.1 22.1
    DXO Dynamic Range (EV) 11.3 12.0
    DXO Low Light (ISO) 703 830
    Screen Specs Canon 40D Sony NEX-3
    Viewfinder Type Optical viewfinder Viewfinder optional
    Viewfinder Field of View 95%
    Viewfinder Magnification 0.59x
    Top-Level Screen Control Panel no Top Display
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 230k dots 920k dots
    LCD Attachment Fixed screen Tilting screen
    Shooting Specs Canon 40D Sony NEX-3
    Focus System Phase-detect AF Contrast-detect AF
    Continuous Shooting 6.5 shutter flaps/s 7 shutter flaps/s
    Fill Flash Built-in Flash no On-Board Flash
    Storage Medium CF cards MS or SDXC cards
    Second Storage Option Single card slot Single card slot
    Connectivity Specs Canon 40D Sony NEX-3
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    USB Connector USB 2.0 USB 2.0
    HDMI Port no HDMI mini HDMI
    Wifi Support no Wifi no Wifi
    Body Specs Canon 40D Sony NEX-3
    Battery Type BP-511A NP-FW50
    Battery Life (CIPA)750 shots per charge330 shots per charge
    Body Dimensions 146 x 108 x 74 mm
    (5.7 x 4.3 x 2.9 in)
    117 x 62 x 33 mm
    (4.6 x 2.4 x 1.3 in)
    Camera Weight 822 g (29.0 oz) 297 g (10.5 oz)

    Did you notice an error on this page? If so, please get in touch, so that we can correct the information.

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