Canon 40D vs 6D
The Canon EOS 40D and the Canon EOS 6D are two enthusiast cameras that were announced, respectively, in August 2007 and September 2012. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (40D) and a full frame (6D) sensor. The 40D has a resolution of 10.1 megapixels, whereas the 6D provides 20 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.
|Canon 40D||Canon 6D|
|Digital single lens reflex||Digital single lens reflex|
|Canon EF mount lenses||Canon EF mount lenses|
|10.1 MP, APS-C Sensor||20 MP, Full Frame Sensor|
|no Video||1080/30p Video|
|ISO 100-1,600 (100 - 3,200)||ISO 100-25,600 (50 - 102,400)|
|Optical viewfinder||Optical viewfinder|
|3.0 LCD, 230k dots||3.0 LCD, 1040k dots|
|Fixed screen (not touch-sensitive)||Fixed screen (not touch-sensitive)|
|6.5 shutter flaps per second||4.5 shutter flaps per second|
|not weather sealed||Weathersealed body|
|750 shots per battery charge||1090 shots per battery charge|
|146 x 108 x 74 mm, 822 g||145 x 111 x 71 mm, 770 g|
Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 40D and the Canon EOS 6D? 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.
An illustration of the physical size and weight of the Canon 40D and the Canon 6D 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 dimensions are rounded to the nearest millimeter.
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Canon 6D is somewhat larger (2 percent) than the Canon 40D. However, the 6D is markedly lighter (6 percent) than the 40D. It is noteworthy in this context that the 6D is splash and dust-proof, while the 40D 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. A larger imaging sensor (as in the 6D) will tend to go along with bigger and heavier lenses, while more compact options are available for the smaller-sensor camera (40D). You can compare the optics available in the Canon EF Lens Catalog.
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, just use the right or left arrows in the table to switch to the respective camera. Alternatively, you can also navigate to the CAM-parator app and make your selection from the full list of cameras there.
|Canon 40D||146 mm||108 mm||74 mm||822 g||750||n||Aug 2007||1,299|
|Canon 6D||145 mm||111 mm||71 mm||770 g||1090||Y||Sep 2012||2,099|
|Canon 6D Mark II||144 mm||111 mm||75 mm||765 g||1200||Y||Jun 2017||1,999|
|Canon 7D II||149 mm||112 mm||78 mm||910 g||670||Y||Sep 2014||1,799|
|Canon 70D||139 mm||104 mm||79 mm||755 g||920||Y||Jul 2013||1,199|
|Canon 1100D||130 mm||100 mm||78 mm||495 g||700||n||Feb 2011||449|
|Canon 60D||145 mm||106 mm||79 mm||755 g||1100||Y||Aug 2010||1,399|
|Canon 5D Mark II||152 mm||114 mm||75 mm||850 g||850||Y||Sep 2008||3,499|
|Canon 50D||146 mm||108 mm||74 mm||822 g||800||Y||Aug 2008||1,299|
|Canon 450D||129 mm||98 mm||62 mm||524 g||500||n||Jan 2008||799|
|Canon 30D||144 mm||106 mm||74 mm||785 g||750||n||Feb 2006||1,399|
|Canon 400D||127 mm||84 mm||65 mm||556 g||370||n||Aug 2006||799|
|Canon 20D||144 mm||106 mm||72 mm||770 g||700||n||Aug 2004||1,499|
|Nikon D610||141 mm||113 mm||82 mm||850 g||900||Y||Oct 2013||1,999|
|Nikon D90||132 mm||103 mm||77 mm||703 g||850||n||Aug 2008||1,299|
|Olympus E-30||142 mm||108 mm||75 mm||701 g||750||n||Nov 2008||1,299|
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
(1) Number of images that can be taken on a full battery charge according to the CIPA-standard; (2) Official announcement.
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 40D was launched at a markedly lower price (by 38 percent) than the 6D, 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. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.
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.
Of the two cameras under consideration, the Canon 40D features an APS-C sensor and the Canon 6D a full frame sensor. The sensor area in the 6D is 160 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.6 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
Technology-wise, the 6D uses a more advanced image processing engine (DIGIC 5+) than the 40D (DIGIC 3), with benefits for noise reduction, color accuracy, and processing speed.
With 20MP, the 6D offers a higher resolution than the 40D (10.1MP), but the 6D nevertheless has larger individual pixels (pixel pitch of 6.57μm versus 5.73μm for the 40D) due to its larger sensor. Moreover, the 6D is a much more recent model (by 5 years) than the 40D, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units.
The resolution advantage of the Canon 6D implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 6D for good quality output (200 dots per inch) amounts to 27.4 x 18.2 inches or 69.5 x 46.3 cm, for very good quality (250 dpi) 21.9 x 14.6 inches or 55.6 x 37.1 cm, and for excellent quality (300 dpi) 18.2 x 12.2 inches or 46.3 x 30.9 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 Canon EOS 6D are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 50-102400.
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 6D offers substantially better image quality than the 40D (overall score 18 points higher). The advantage is based on 1.7 bits higher color depth, 0.8 EV in additional dynamic range, and 1.7 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.
|Canon 6D||Full Frame||20.0||5472||3648||1080/30p||23.8||12.1||2340||82|
|Canon 6D Mark II||Full Frame||26.0||6240||4160||1080/60p||24.4||11.9||2862||85|
|Canon 7D II||APS-C||20.0||5472||3648||1080/60p||22.4||11.8||1082||70|
|Canon 5D Mark II||Full Frame||21.0||5616||3744||1080/30p||23.7||11.9||1815||79|
|Nikon D610||Full Frame||24.2||6016||4016||1080/30p||25.1||14.4||2925||94|
|Olympus E-30||Four Thirds||12.2||4032||3024||none||21.3||10.4||530||55|
Many modern cameras are not only capable of taking still images, but can also record movies. The 6D indeed provides for movie recording, while the 40D does not. The highest resolution format that the 6D can use is 1080/30p.
Apart from body and sensor, cameras can and do differ across a range of features. The 40D and the 6D 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 viewfinder in the 6D offers a wider field of view (97%) than the one in the 40D (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the 6D has a higher magnification (0.71x vs 0.59x), 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 40D and Canon 6D along with similar information for a selection of comparators.
|Canon 6D Mark II||optical||Y||3.0||1040||swivel||Y||1/4000s||6.5||n||n|
|Canon 7D II||optical||Y||3.0||1040||fixed||n||1/8000s||10.0||Y||n|
|Canon 5D Mark II||optical||Y||3.0||920||fixed||n||1/8000s||3.9||n||n|
One difference between the cameras concerns the presence of an on-board flash. The 40D has one, while the 6D 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 40D writes its imaging data to Compact Flash cards, while the 6D uses SDXC cards.
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 EOS 6D and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
| WiFi |
|Canon 6D Mark II||Y||stereo||mono||Y||-||mini||2.0||Y||Y||Y|
|Canon 7D II||Y||stereo||mono||Y||Y||mini||3.0||-||-||-|
|Canon 5D Mark II||Y||mono||mono||Y||-||mini||2.0||-||-||-|
It is notable that the 6D offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the 40D does not provide wifi capability.
Studio photographers will appreciate that the Canon 40D (unlike the 6D) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
Travel and landscape photographers will find it useful that the 6D has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.
Both the 40D and the 6D have been discontinued, but can regularly be found used on eBay. The 40D was replaced by the Canon 50D, while the 6D was followed by the Canon 6D Mark II. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon website.
So what conclusions can be drawn? Is the Canon 40D better than the Canon 6D or vice versa? The listing below highlights the relative strengths of the two models.
Advantages of the Canon EOS 40D:
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- Faster burst: Shoots at higher frequency (6.5 vs 4.5 flaps/sec) to capture the decisive moment.
- 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 affordable: Was introduced into a lower priced category (38 percent cheaper at launch).
- More heavily discounted: Has been available for much longer (launched in August 2007).
Arguments in favor of the Canon EOS 6D:
- More detail: Has more megapixels (20 vs 10.1MP), which boosts linear resolution by 41%.
- Better image quality: Scores substantially higher (18 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (1.7 bits more color depth).
- More dynamic range: Captures a broader range of light and dark details (0.8 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (1.7 stops ISO advantage).
- Better jpgs: Has a more modern image processing engine (DIGIC 5+ vs DIGIC 3).
- Broader imaging potential: Can capture not only stills but also 1080/30p video.
- More complete view: Has a viewfinder with a larger field of view (97% vs 95%).
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.71x vs 0.59x).
- More detailed LCD: Has a higher resolution rear screen (1040k vs 230k dots).
- Longer lasting: Gets more shots (1090 versus 750) out of a single battery charge.
- Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
- Easier geotagging: Features an internal GPS sensor to log localization data.
- Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
- More modern: Reflects 5 years of technical progress since the 40D launch.
If the number of relative strengths (bullet points above) is taken as a guide, the 6D is the clear winner of the contest (15 : 6 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 wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro 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 40D and the Canon 6D 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 incomplete and does no justice, for example, to the way the 40D or the 6D 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.
This is why hands-on reviews by experts are important. The following table reports the overall ratings of the cameras as published by some of the major camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, and photographyblog). 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.
|Canon 40D||+ +||+ +||4.5/5||o||4.5/5||Aug 2007||1,299|
|Canon 6D||+ +||83/100||4.5/5||4.5/5||4.5/5||Sep 2012||2,099|
|Canon 6D Mark II||+||80/100||4.5/5||4/5||4/5||Jun 2017||1,999|
|Canon 7D II||+||84/100||4/5||5/5||4.5/5||Sep 2014||1,799|
|Canon 70D||+ +||83/100||4.5/5||4.5/5||5/5||Jul 2013||1,199|
|Canon 1100D||80/100||69/100||4/5||4/5||4.5/5||Feb 2011||449|
|Canon 60D||+||79/100||4/5||5/5||4.5/5||Aug 2010||1,399|
|Canon 5D Mark II||91/100||79/100||4/5||5/5||..||Sep 2008||3,499|
|Canon 50D||+ +||+ +||4.5/5||5/5||4.5/5||Aug 2008||1,299|
|Canon 450D||+ +||+ +||4/5||5/5||4.5/5||Jan 2008||799|
|Canon 30D||+ +||+ +||o||o||..||Feb 2006||1,399|
|Canon 400D||+ +||+ +||o||4.5/5||4/5||Aug 2006||799|
|Canon 20D||..||+ +||..||o||..||Aug 2004||1,499|
|Nikon D610||+ +||87/100||4.5/5||4.5/5||4.5/5||Oct 2013||1,999|
|Nikon D90||+ +||+ +||4/5||5/5||4.5/5||Aug 2008||1,299|
|Olympus E-30||..||71/100||4.5/5||..||4/5||Nov 2008||1,299|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
The review scores listed above should be treated with care, though. The assessments were made in relation to similar cameras of the same technological generation. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.
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.
- Canon 40D vs Fujifilm X-A7
- Canon 40D vs Olympus E-P5
- Canon 40D vs Sony NEX-6
- Canon 40D vs Sony NEX-C3
- Canon 6D Mark II vs Fujifilm X-T20
- Canon 6D Mark II vs Pentax K-3 II
- Canon 6D Mark II vs Sony RX1
- Canon 6D vs Canon SX720
- Canon 6D vs Panasonic GH1
- Canon 6D vs Panasonic GX1
- Canon 6D vs Panasonic L10
- Canon 6D vs Pentax K-70
Specifications: Canon 40D vs Canon 6D
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 Model||Canon 40D||Canon 6D|
|Camera Type||Digital single lens reflex||Digital single lens reflex|
|Camera Lens||Canon EF mount lenses||Canon EF mount lenses|
|Launch Date||August 2007||September 2012|
|Launch Price||USD 1,299||USD 2,099|
|Sensor Specs||Canon 40D||Canon 6D|
|Sensor Format||APS-C Sensor||Full Frame Sensor|
|Sensor Size||22.3 x 14.9 mm||36.0 x 24.0 mm|
|Sensor Area||332.27 mm2||864 mm2|
|Sensor Diagonal||26.8 mm||43.3 mm|
|Sensor Resolution||10.1 Megapixels||20 Megapixels|
|Image Resolution||3888 x 2592 pixels||5472 x 3648 pixels|
|Pixel Pitch||5.73 μm||6.57 μm|
|Pixel Density||3.03 MP/cm2||2.31 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||no Video||1080/30p Video|
|ISO Setting||100 - 1,600 ISO||100 - 25,600 ISO|
|ISO Boost||100 - 3,200 ISO||50 - 102,400 ISO|
|Image Processor||DIGIC 3||DIGIC 5+|
|DXO Sensor Quality (score)||64||82|
|DXO Color Depth (bits)||22.1||23.8|
|DXO Dynamic Range (EV)||11.3||12.1|
|DXO Low Light (ISO)||703||2340|
|Screen Specs||Canon 40D||Canon 6D|
|Viewfinder Type||Optical viewfinder||Optical viewfinder|
|Viewfinder Field of View||95%||97%|
|Top-Level Screen||Control Panel||Control Panel|
|LCD Framing||Live View||Live View|
|Rear LCD Size||3.0inch||3.0inch|
|LCD Resolution||230k dots||1040k dots|
|LCD Attachment||Fixed screen||Fixed screen|
|Shooting Specs||Canon 40D||Canon 6D|
|Focus System||Phase-detect AF||Phase-detect AF|
|Continuous Shooting||6.5 shutter flaps/s||4.5 shutter flaps/s|
|Shutter Life Expectancy||100 000 actuations||100 000 actuations|
|Fill Flash||Build-in Flash||no On-Board Flash|
|Storage Medium||CF cards||SDXC cards|
|Second Storage Option||Single card slot||Single card slot|
|Connectivity Specs||Canon 40D||Canon 6D|
|Studio Flash||PC Sync socket||no PC Sync|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||no HDMI||mini HDMI|
|Microphone Port||no MIC socket||External MIC port|
|Wifi Support||no Wifi||Wifi built-in|
|Geotagging||no internal GPS||GPS built-in|
|Body Specs||Canon 40D||Canon 6D|
|Environmental Sealing||not weather sealed||Weathersealed body|
|Battery Life (CIPA)||750 shots per charge||1090 shots per charge|
146 x 108 x 74 mm
(5.7 x 4.3 x 2.9 in)
145 x 111 x 71 mm
(5.7 x 4.4 x 2.8 in)
|Camera Weight||822 g (29.0 oz)||770 g (27.2 oz)|
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