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Canon 40D vs G15

The Canon EOS 40D and the Canon PowerShot G15 are two digital cameras that were revealed to the public, respectively, in August 2007 and September 2012. The 40D is a DSLR, while the G15 is a fixed lens compact. The cameras are based on an APS-C (40D) and a 1/1.7-inch (G15) sensor. The 40D has a resolution of 10.1 megapixels, whereas the G15 provides 12 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 Canon G15
Canon 40D Canon G15
Digital single lens reflex Fixed lens compact camera
Canon EF mount lenses 28-140mm f/1.8-2.8
10.1 MP, APS-C Sensor 12 MP, 1/1.7" Sensor
no Video 1080/24p Video
ISO 100-1,600 (100 - 3,200) ISO 80-12,800
Optical viewfinder Optical viewfinder
3.0 LCD, 230k dots 3.0 LCD, 922k dots
Fixed screen (not touch-sensitive) Fixed screen (not touch-sensitive)
6.5 shutter flaps per second 2.1 shutter flaps per second
750 shots per battery charge350 shots per battery charge
146 x 108 x 74 mm, 822 g 107 x 76 x 40 mm, 352 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 40D and the Canon PowerShot G15? 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 40D and the Canon G15 is provided in the side-by-side display below. The two cameras are presented according to their relative size. 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.

Size Canon 40D vs Canon G15
Compare 40D versus G15 top
Comparison 40D or G15 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Canon G15 is considerably smaller (48 percent) than the Canon 40D. In this context, it is worth noting that neither the 40D nor the G15 are weather-sealed.

The above size and weight comparisons are to some extent incomplete and possibly misleading, as the G15 has a lens built in, whereas the 40D is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup. You can compare the optics available for the 40D and their specifications in the Canon EF Lens Catalog.

Concerning battery life, the 40D gets 750 shots out of its BP-511A battery, while the G15 can take 350 images on a single charge of its NB-10L power pack.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. 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.
 
Canon G15 107 mm 76 mm 40 mm 352 g 350 n Sep 2012 499i
3.
 
Canon G16 109 mm 76 mm 40 mm 356 g 360 n Aug 2013 549 i
4.
 
Canon SX50 123 mm 87 mm 106 mm 595 g 315 n Sep 2012 429i
5.
 
Canon T3 130 mm 100 mm 78 mm 495 g 700 n Feb 2011 449i
6.
 
Canon 60D 145 mm 106 mm 79 mm 755 g 1100 Y Aug 2010 1,399i
7.
 
Canon G12 112 mm 76 mm 48 mm 401 g 370 n Sep 2010 499i
8.
 
Canon 50D 146 mm 108 mm 74 mm 822 g 800 Y Aug 2008 1,299i
9.
 
Canon XS 126 mm 98 mm 65 mm 502 g 500 n Jun 2008 449i
10.
 
Canon XSi 129 mm 98 mm 62 mm 524 g 500 n Jan 2008 799i
11.
 
Canon 30D 144 mm 106 mm 74 mm 785 g 750 n Feb 2006 1,399i
12.
 
Canon XTi 127 mm 84 mm 65 mm 556 g 370 n Aug 2006 799i
13.
 
Canon 20D 144 mm 106 mm 72 mm 770 g 700 n Aug 2004 1,499i
14.
 
Canon 10D 150 mm 107 mm 75 mm 850 g 500 n Feb 2003 1,999i
15.
 
Fujifilm X10 117 mm 70 mm 57 mm 350 g 270 n Sep 2011 599i
16.
 
Nikon D90 132 mm 103 mm 77 mm 703 g 850 n Aug 2008 1,299i
17.
 
Panasonic LX7 111 mm 68 mm 46 mm 298 g 330 n Jul 2012 499i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

Any camera decision will naturally be influenced heavily by the price. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The G15 was launched at a lower price than the 40D, despite having a lens built in. 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.

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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. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and 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.

Of the two cameras under consideration, the Canon 40D features an APS-C sensor and the Canon G15 a 1/1.7-inch sensor. The sensor area in the G15 is 87 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.6 and 4.6. The sensor in the 40D has a native 3:2 aspect ratio, while the one in the G15 offers a 4:3 aspect.

Technology-wise, the G15 uses a more advanced image processing engine (DIGIC 5) than the 40D (DIGIC 3), with benefits for noise reduction, color accuracy, and processing speed.

Canon 40D and Canon G15 sensor measures

Despite having a smaller sensor, the G15 offers a higher resolution of 12 megapixels, compared with 10.1 MP of the 40D. 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 1.89μm versus 5.73μm for the 40D). However, it should be noted that the G15 is much more recent (by 5 years) than the 40D, 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 Canon G15 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the G15 for good quality output (200 dots per inch) amounts to 20 x 15 inches or 50.8 x 38.1 cm, for very good quality (250 dpi) 16 x 12 inches or 40.6 x 30.5 cm, and for excellent quality (300 dpi) 13.3 x 10 inches or 33.9 x 25.4 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 Canon PowerShot G15 are ISO 80 to ISO 12800 (no boost).

40D versus G15 MP

For many cameras, data on sensor performance has been reported by DXO Mark. 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 40D provides substantially higher image quality than the G15, with an overall score that is 18 points higher. This advantage is based on 2.2 bits higher color depth, 0.2 EV of lower dynamic range, and 2.1 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
    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.
 
Canon G15 1/1.7 12.0 4000 30001080/24p19.911.516546
3.
 
Canon G16 1/1.7 12.0 4000 30001080/60p21.011.723054
4.
 
Canon SX50 1/2.3 12.0 4000 30001080/24p20.311.217947
5.
 
Canon T3 APS-C 12.2 4272 2848720/30p21.911.075562
6.
 
Canon 60D APS-C 17.9 5184 34561080/30p22.211.581366
7.
 
Canon G12 1/1.7 10.0 3648 2736720/24p20.411.216147
8.
 
Canon 50D APS-C 15.1 4752 3168none21.811.469663
9.
 
Canon XS APS-C 10.1 3888 2592none........
10.
 
Canon XSi APS-C 12.2 4272 2848none21.910.869261
11.
 
Canon 30D APS-C 8.2 3504 2336none21.510.873659
12.
 
Canon XTi APS-C 10.1 3888 2592none22.111.066462
13.
 
Canon 20D APS-C 8.2 3504 2336none21.911.072162
14.
 
Canon 10D APS-C 6.3 3072 2048none21.110.957157
15.
 
Fujifilm X10 2/3 12.0 4000 30001080/30p20.511.324550
16.
 
Nikon D90 APS-C 12.2 4288 2848720/24p22.712.597773
17.
 
Panasonic LX7 1/1.7 10.0 3648 27361080/60p20.711.714750

Many modern cameras are not only capable of taking still images, but can also record movies. The G15 indeed provides for movie recording, while the 40D does not. The highest resolution format that the G15 can use is 1080/24p.

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Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. The 40D and the G15 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 table below summarizes some of the other core capabilities of the Canon 40D and Canon G15 in connection with corresponding information for a sample of similar cameras.

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Core Features
    Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Size
(inch)
LCD
Resolution
(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 Y 3.0 230 fixed n 1/8000s 6.5 Y n
2.
 
Canon G15optical n 3.0 922 fixed n 1/4000s 2.1 Y Y
3.
 
Canon G16optical n 3.0 922 fixed n 1/4000s 2.2 Y Y
4.
 
Canon SX50202 n 3.0 461 swivel n 1/2000s 2.2 Y Y
5.
 
Canon T3optical n 2.7 230 fixed n 1/4000s 3.0 Y n
6.
 
Canon 60Doptical Y 3.0 1040 swivel n 1/8000s 5.3 Y n
7.
 
Canon G12optical n 2.8 461 swivel n 1/4000s 1.1 Y Y
8.
 
Canon 50Doptical Y 3.0 920 fixed n 1/8000s 6.3 Y n
9.
 
Canon XSoptical n 2.5 230 fixed n 1/4000s 3.0 Y n
10.
 
Canon XSioptical n 3.0 230 fixed n 1/4000s 3.5 Y n
11.
 
Canon 30Doptical Y 2.5 230 fixed n 1/8000s 5.0 Y n
12.
 
Canon XTioptical n 2.5 230 fixed n 1/4000s 3.0 Y n
13.
 
Canon 20Doptical Y 1.8 118 fixed n 1/8000s 5.0 Y n
14.
 
Canon 10Doptical Y 1.8 118 fixed n 1/4000s 3.0 Y n
15.
 
Fujifilm X10optical n 2.8 460 fixed n 1/4000s 10.0 Y Y
16.
 
Nikon D90optical Y 3.0 920 fixed n 1/4000s 4.5 Y n
17.
 
Panasonic LX7optional n 3.0 920 fixed n 1/4000s 11.0 Y Y

One feature that is present on the 40D, but is missing on the G15 is a top-level LCD. While being, of course, smaller than the rear screen, the control panel conveys some of the essential shooting information and can be convenient for quick and easy settings verification.

The 40D writes its imaging data to Compact Flash cards, while the G15 uses SDXC cards.

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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 Canon EOS 40D and Canon PowerShot G15 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
Microphone
Internal
Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Canon 40DY-----2.0---
2.
 
Canon G15Ystereomono--mini2.0---
3.
 
Canon G16Ystereomono--mini2.0Y--
4.
 
Canon SX50Ystereomono--mini2.0---
5.
 
Canon T3Ystereomono--mini2.0---
6.
 
Canon 60DYmonomonoY-mini2.0---
7.
 
Canon G12Ystereomono--mini2.0---
8.
 
Canon 50DY----mini2.0---
9.
 
Canon XSY-----2.0---
10.
 
Canon XSiY----mini2.0---
11.
 
Canon 30DY-----2.0---
12.
 
Canon XTiY-----2.0---
13.
 
Canon 20DY-----1.1---
14.
 
Canon 10DY-----1.1---
15.
 
Fujifilm X10Ystereomono--mini2.0---
16.
 
Nikon D90Ymonomono--mini2.0---
17.
 
Panasonic LX7Ystereomono--mini2.0---

Studio photographers will appreciate that the Canon 40D (unlike the G15) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the 40D and the G15 have been discontinued, but can regularly be found used on eBay. The 40D was replaced by the Canon 50D, while the G15 was followed by the Canon G16. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon website.

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Review summary

So what is the bottom line? Which of the two cameras – the Canon 40D or the Canon G15 – 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.


Reasons to prefer the Canon EOS 40D:

  • Better image quality: Scores substantially higher (18 points) in the DXO overall assessment.
  • Richer colors: Generates images with noticeably better colors (2.2 bits more color depth).
  • Better low-light sensitivity: Requires less light for good images (2.1 stops ISO advantage).
  • 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.
  • Faster burst: Shoots at higher frequency (6.5 vs 2.1 flaps/sec) to capture the decisive moment.
  • More flexible: Can take a variety of interchangeable lenses, including specialty optics.
  • Longer lasting: Can take more shots (750 versus 350) on a single battery charge.
  • 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).


Advantages of the Canon PowerShot G15:

  • More detail: Has more megapixels (12 vs 10.1MP), which boosts linear resolution by 7%.
  • Better jpgs: Has a more modern image processing engine (DIGIC 5 vs DIGIC 3).
  • Broader imaging potential: Can capture not only stills but also 1080/24p video.
  • More detailed LCD: Has a higher resolution rear screen (922k vs 230k dots).
  • Ready to shoot: Comes with an integrated lens, while the 40D requires a separate lens.
  • More compact: Is smaller (107x76mm vs 146x108mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight even though it has a lens built in (unlike the 40D).
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • More affordable: Was introduced at a lower price, despite coming with a built-in lens.
  • More modern: Reflects 5 years of technical progress since the 40D launch.

If the count of relative strengths (bullet points above) is taken as a measure, the match-up finishes in a tie (10 points each). 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 10:10 G15

How about other alternatives? Do the specifications of the Canon 40D and the Canon G15 place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Travel-Zoom Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it says little about, for example, the shooting experience and imaging performance of the 40D and the G15 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 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], 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 
 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.
 
Canon G154/5+76/1004.5/54.5/5 Sep 2012 499i
3.
 
Canon G164/5+..4.5/54.5/5 Aug 2013 549 i
4.
 
Canon SX503/5+ +72/1004.5/54.5/5 Sep 2012 429i
5.
 
Canon T3..80/10069/1004/54.5/5 Feb 2011 449i
6.
 
Canon 60D5/5+79/1004/54.5/5 Aug 2010 1,399i
7.
 
Canon G124/5+73/1004.5/54.5/5 Sep 2010 499i
8.
 
Canon 50D..+ ++ +4.5/54.5/5 Aug 2008 1,299i
9.
 
Canon XS..82/100+ +3.5/54.5/5 Jun 2008 449i
10.
 
Canon XSi..+ ++ +4/54.5/5 Jan 2008 799i
11.
 
Canon 30D..+ ++ +o.. Feb 2006 1,399i
12.
 
Canon XTi..+ ++ +o4/5 Aug 2006 799i
13.
 
Canon 20D....+ +.... Aug 2004 1,499i
14.
 
Canon 10D....+ +.... Feb 2003 1,999i
15.
 
Fujifilm X10....76/1004/54.5/5 Sep 2011 599i
16.
 
Nikon D90..+ ++ +4/54.5/5 Aug 2008 1,299i
17.
 
Panasonic LX73/5+ +75/1004/54.5/5 Jul 2012 499i
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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, please note that some of the review sites have changed their methodology and reporting over time.

Canon 40D:
Check Ebay offers
Canon G15:
Check Ebay offers

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 your choice using the following search menu. 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 Canon G15

    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 Canon G15
    Camera Type Digital single lens reflex Fixed lens compact camera
    Camera Lens Canon EF mount lenses 28-140mm f/1.8-2.8
    Launch Date August 2007 September 2012
    Launch Price USD 1,299 USD 499
    Sensor Specs Canon 40D Canon G15
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor 1/1.7" Sensor
    Sensor Size 22.3 x 14.9 mm 7.6 x 5.7 mm
    Sensor Area 332.27 mm2 43.32 mm2
    Sensor Diagonal 26.8 mm 9.5 mm
    Crop Factor 1.6x 4.6x
    Sensor Resolution 10.1 Megapixels 12 Megapixels
    Image Resolution 3888 x 2592 pixels 4000 x 3000 pixels
    Pixel Pitch 5.73 μm 1.89 μm
    Pixel Density 3.03 MP/cm2 27.70 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability no Video 1080/24p Video
    ISO Setting 100 - 1,600 ISO 80 - 12,800 ISO
    ISO Boost 100 - 3,200 ISO no Enhancement
    Image Processor DIGIC 3 DIGIC 5
    DXO Sensor Quality (score) 64 46
    DXO Color Depth (bits) 22.1 19.9
    DXO Dynamic Range (EV) 11.3 11.5
    DXO Low Light (ISO) 703 165
    Screen Specs Canon 40D Canon G15
    Viewfinder Type Optical viewfinder Optical viewfinder
    Viewfinder Field of View 95% 80%
    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 922k dots
    LCD Attachment Fixed screen Fixed screen
    Shooting Specs Canon 40D Canon G15
    Focus System Phase-detect AF Contrast-detect AF
    Continuous Shooting 6.5 shutter flaps/s 2.1 shutter flaps/s
    Fill Flash Build-in Flash Build-in Flash
    Storage Medium CF cards SDXC cards
    Second Storage Option Single card slot Single card slot
    Connectivity Specs Canon 40D Canon G15
    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 Canon G15
    Battery Type BP-511A NB-10L
    Battery Life (CIPA)750 shots per charge350 shots per charge
    Body Dimensions 146 x 108 x 74 mm
    (5.7 x 4.3 x 2.9 in)
    107 x 76 x 40 mm
    (4.2 x 3.0 x 1.6 in)
    Camera Weight 822 g (29.0 oz) 352 g (12.4 oz)

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