Canon 40D vs SL2
The Canon EOS 40D and the Canon EOS Rebel SL2 (labelled Canon 200D in some countries) are two digital cameras that were announced, respectively, in August 2007 and June 2017. Both are DSLR (Digital Single Lens Reflex) cameras that are equipped with an APS-C sensor. The 40D has a resolution of 10.1 megapixels, whereas the SL2 provides 24 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.
|Canon 40D||Canon SL2|
|Digital single lens reflex||Digital single lens reflex|
|Canon EF mount lenses||Canon EF mount lenses|
|10.1 MP, APS-C Sensor||24 MP, APS-C Sensor|
|no Video||1080/60p Video|
|ISO 100-1600 (100-3200)||ISO 100-25600 (100-51200)|
|Optical viewfinder||Optical viewfinder|
|3.0" LCD, 230k dots||3.0" LCD, 1040k dots|
|Fixed screen (not touch-sensitive)||Swivel touchscreen|
|6.5 shutter flaps per second||5 shutter flaps per second|
|750 shots per battery charge||650 shots per battery charge|
|146 x 108 x 74 mm, 822 g||122 x 93 x 70 mm, 453 g|
Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 40D and the Canon EOS Rebel SL2? 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.
The side-by-side display below illustrates the physical size and weight of the Canon 40D and the Canon SL2. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All size dimensions are rounded to the nearest millimeter.
The SL2 can be obtained in two different colors (black, white), while the 40D 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 Canon SL2 is notably smaller (28 percent) than the Canon 40D. Moreover, the SL2 is substantially lighter (45 percent) than the 40D. In this context, it is worth noting that neither the 40D nor the SL2 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. In this particular case, both cameras feature the same lens mount, so that they can use the same lenses. 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»||5.7 in||4.3 in||2.9 in||29.0 oz||750||n||Aug 2007||1,299||Canon 40D|
|Canon SL2«||4.8 in||3.7 in||2.8 in||16.0 oz||650||n||Jun 2017||549||Canon SL2|
|Canon SL3« »||4.8 in||3.7 in||2.8 in||15.8 oz||1070||n||Apr 2019||599||Canon SL3|
|Canon T7« »||5.1 in||4.0 in||3.1 in||16.8 oz||500||n||Feb 2018||449||Canon T7|
|Canon 77D« »||5.2 in||3.9 in||3.0 in||19.0 oz||600||n||Feb 2017||899||Canon 77D|
|Canon T6s« »||5.2 in||4.0 in||3.1 in||19.9 oz||440||n||Feb 2015||649||Canon T6s|
|Canon SL1« »||4.6 in||3.6 in||2.7 in||14.4 oz||380||n||Mar 2013||549||Canon SL1|
|Canon T3« »||5.1 in||3.9 in||3.1 in||17.5 oz||700||n||Feb 2011||449||Canon T3|
|Canon 60D« »||5.7 in||4.2 in||3.1 in||26.6 oz||1100||Y||Aug 2010||1,399||Canon 60D|
|Canon 50D« »||5.7 in||4.3 in||2.9 in||29.0 oz||800||Y||Aug 2008||1,299||Canon 50D|
|Canon XS« »||5.0 in||3.9 in||2.6 in||17.7 oz||500||n||Jun 2008||449||Canon XS|
|Canon XSi« »||5.1 in||3.9 in||2.4 in||18.5 oz||500||n||Jan 2008||799||Canon XSi|
|Canon 30D« »||5.7 in||4.2 in||2.9 in||27.7 oz||750||n||Feb 2006||1,399||Canon 30D|
|Canon XTi« »||5.0 in||3.3 in||2.6 in||19.6 oz||370||n||Aug 2006||799||Canon XTi|
|Canon 20D« »||5.7 in||4.2 in||2.8 in||27.2 oz||700||n||Aug 2004||1,499||Canon 20D|
|Canon 10D« »||5.9 in||4.2 in||3.0 in||30.0 oz||500||n||Feb 2003||1,999||Canon 10D|
|Nikon D90« »||5.2 in||4.1 in||3.0 in||24.8 oz||850||n||Aug 2008||1,299||Nikon D90|
|Note: Measurements and pricing do not include easily detachable parts, such as interchangeable lenses or optional viewfinders.|
Any camera decision will naturally be influenced heavily by the price. 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 SL2 was launched at a markedly lower price (by 58 percent) than the 40D, which puts it into a different market segment. 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.
The size of the sensor inside a digital camera is one of the key determinants 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. 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 more expensive and lead to bigger and heavier cameras and lenses.
Both cameras under consideration feature an APS-C sensor and have a format factor (sometimes also referred to as "crop factor") of 1.6. Within the spectrum of camera sensors, this places the review cameras among the medium-sized sensor cameras that aim to strike a balance between image quality and portability. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
Technology-wise, the SL2 uses a more advanced image processing engine (DIGIC 7) than the 40D (DIGIC 3), with benefits for noise reduction, color accuracy, and processing speed.
While the two cameras under review share the same sensor size, the SL2 offers a higher resolution of 24 megapixels, compared with 10.1 MP of the 40D. This megapixels advantage translates into a 54 percent gain in linear resolution. On the other hand, these sensor specs imply that the SL2 has a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.72μm versus 5.73μm for the 40D). However, it should be noted that the SL2 is much more recent (by 9 years and 10 months) than the 40D, and its sensor will have benefitted from technological advances during this time that compensate for the smaller pixel size.
The resolution advantage of the Canon SL2 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the SL2 for good quality output (200 dots per inch) amounts to 30 x 20 inch or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inch or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inch or 50.8 x 33.9 cm. The corresponding values for the Canon 40D are 19.4 x 13 inch or 49.4 x 32.9 cm for good quality, 15.6 x 10.4 inch or 39.5 x 26.3 cm for very good quality, and 13 x 8.6 inch or 32.9 x 21.9 cm for excellent quality prints.
The SL2 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
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 Rebel SL2 are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 100-51200.
Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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 SL2 offers substantially better image quality than the 40D (overall score 15 points higher). The advantage is based on 1.5 bits higher color depth, 2.1 EV in additional dynamic range, and 0.6 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 40D||APS-C||10.1||3888||2592||none||22.1||11.3||703||64||Canon 40D|
|Canon SL2||APS-C||24.0||6000||4000||1080/60p||23.6||13.4||1041||79||Canon SL2|
|Canon SL3||APS-C||24.0||6000||4000||4K/25p||..||..||..||..||Canon SL3|
|Canon T7||APS-C||24.0||6000||4000||1080/30p||..||..||..||..||Canon T7|
|Canon 77D||APS-C||24.0||6000||4000||1080/60p||23.6||13.3||971||78||Canon 77D|
|Canon T6s||APS-C||24.0||6000||4000||1080/30p||22.6||12.0||915||70||Canon T6s|
|Canon SL1||APS-C||17.9||5184||3456||1080/30p||21.8||11.3||843||63||Canon SL1|
|Canon T3||APS-C||12.2||4272||2848||720/30p||21.9||11.0||755||62||Canon T3|
|Canon 60D||APS-C||17.9||5184||3456||1080/30p||22.2||11.5||813||66||Canon 60D|
|Canon 50D||APS-C||15.1||4752||3168||none||21.8||11.4||696||63||Canon 50D|
|Canon XS||APS-C||10.1||3888||2592||none||..||..||..||..||Canon XS|
|Canon XSi||APS-C||12.2||4272||2848||none||21.9||10.8||692||61||Canon XSi|
|Canon 30D||APS-C||8.2||3504||2336||none||21.5||10.8||736||59||Canon 30D|
|Canon XTi||APS-C||10.1||3888||2592||none||22.1||11.0||664||62||Canon XTi|
|Canon 20D||APS-C||8.2||3504||2336||none||21.9||11.0||721||62||Canon 20D|
|Canon 10D||APS-C||6.3||3072||2048||none||21.1||10.9||571||57||Canon 10D|
|Nikon D90||APS-C||12.2||4288||2848||720/24p||22.7||12.5||977||73||Nikon D90|
Many modern cameras are not only capable of taking still images, but can also record movies. The SL2 indeed provides for movie recording, while the 40D does not. The highest resolution format that the SL2 can use is 1080/60p.
Apart from body and sensor, cameras can and do differ across a range of features. The 40D and the SL2 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 40D has a higher magnification than the one of the SL2 (0.59x vs 0.54x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The table below summarizes some of the other core capabilities of the Canon 40D and Canon SL2 in connection with corresponding information for a sample of similar cameras.
|Canon 40D||optical||Y||3.0||230||fixed||n||1/8000s||6.5||Y||n||Canon 40D|
|Canon SL2||optical||n||3.0||1040||swivel||Y||1/4000s||5.0||Y||n||Canon SL2|
|Canon SL3||optical||n||3.0||1040||swivel||Y||1/4000s||5.0||Y||n||Canon SL3|
|Canon T7||optical||n||3.0||920||fixed||n||1/4000s||3.0||Y||n||Canon T7|
|Canon 77D||optical||Y||3.0||1040||swivel||Y||1/4000s||6.0||Y||n||Canon 77D|
|Canon T6s||optical||Y||3.0||1040||swivel||Y||1/4000s||5.0||Y||n||Canon T6s|
|Canon SL1||optical||n||3.0||1040||fixed||Y||1/4000s||4.9||Y||n||Canon SL1|
|Canon T3||optical||n||2.7||230||fixed||n||1/4000s||3.0||Y||n||Canon T3|
|Canon 60D||optical||Y||3.0||1040||swivel||n||1/8000s||5.3||Y||n||Canon 60D|
|Canon 50D||optical||Y||3.0||920||fixed||n||1/8000s||6.3||Y||n||Canon 50D|
|Canon XS||optical||n||2.5||230||fixed||n||1/4000s||3.0||Y||n||Canon XS|
|Canon XSi||optical||n||3.0||230||fixed||n||1/4000s||3.5||Y||n||Canon XSi|
|Canon 30D||optical||Y||2.5||230||fixed||n||1/8000s||5.0||Y||n||Canon 30D|
|Canon XTi||optical||n||2.5||230||fixed||n||1/4000s||3.0||Y||n||Canon XTi|
|Canon 20D||optical||Y||1.8||118||fixed||n||1/8000s||5.0||Y||n||Canon 20D|
|Canon 10D||optical||Y||1.8||118||fixed||n||1/4000s||3.0||Y||n||Canon 10D|
|Nikon D90||optical||Y||3.0||920||fixed||n||1/4000s||4.5||Y||n||Nikon D90|
One feature that is present on the 40D, but is missing on the SL2 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 SL2 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 Canon SL2 has an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.
The 40D writes its imaging data to Compact Flash cards, while the SL2 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 Rebel SL2 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
|Canon 40D||Y||none||none||-||-||none||2.0||-||-||-||Canon 40D|
|Canon SL2||Y||stereo||mono||Y||-||mini||2.0||Y||Y||Y||Canon SL2|
|Canon SL3||Y||stereo||mono||Y||-||mini||2.0||Y||-||Y||Canon SL3|
|Canon T7||Y||mono||mono||-||-||mini||2.0||Y||Y||-||Canon T7|
|Canon 77D||Y||stereo||mono||Y||-||mini||2.0||Y||Y||Y||Canon 77D|
|Canon T6s||Y||stereo||mono||Y||-||mini||2.0||Y||Y||-||Canon T6s|
|Canon SL1||Y||mono||mono||Y||-||mini||2.0||-||-||-||Canon SL1|
|Canon T3||Y||stereo||mono||-||-||mini||2.0||-||-||-||Canon T3|
|Canon 60D||Y||mono||mono||Y||-||mini||2.0||-||-||-||Canon 60D|
|Canon 50D||Y||none||none||-||-||mini||2.0||-||-||-||Canon 50D|
|Canon XS||Y||none||none||-||-||none||2.0||-||-||-||Canon XS|
|Canon XSi||Y||none||none||-||-||mini||2.0||-||-||-||Canon XSi|
|Canon 30D||Y||none||none||-||-||none||2.0||-||-||-||Canon 30D|
|Canon XTi||Y||none||none||-||-||none||2.0||-||-||-||Canon XTi|
|Canon 20D||Y||none||none||-||-||none||1.1||-||-||-||Canon 20D|
|Canon 10D||Y||none||none||-||-||none||1.1||-||-||-||Canon 10D|
|Nikon D90||Y||mono||mono||-||-||mini||2.0||-||-||-||Nikon D90|
It is notable that the SL2 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 offer wifi capability.
Studio photographers will appreciate that the Canon 40D (unlike the SL2) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
Both the 40D and the SL2 have been discontinued, but can regularly be found used on eBay. The 40D was replaced by the Canon 50D, while the SL2 was followed by the Canon SL2. 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 how do things add up? Is the Canon 40D better than the Canon SL2 or vice versa? The listing below highlights the relative strengths of the two models.
Advantages of the Canon EOS 40D:
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.59x vs 0.54x).
- 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 5 flaps/sec) to capture the decisive moment.
- Longer lasting: Can take more shots (750 versus 650) 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).
Reasons to prefer the Canon EOS Rebel SL2:
- More detail: Has more megapixels (24 vs 10.1MP), which boosts linear resolution by 54%.
- Better image quality: Scores substantially higher (15 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (1.5 bits more color depth).
- More dynamic range: Captures a broader range of light and dark details (2.1 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (0.6 stops ISO advantage).
- Better jpgs: Has a more modern image processing engine (DIGIC 7 vs DIGIC 3).
- Broader imaging potential: Can capture not only stills but also 1080/60p video.
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- More detailed LCD: Has a higher resolution rear screen (1040k vs 230k dots).
- More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
- Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
- More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
- Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
- More compact: Is smaller (122x93mm vs 146x108mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight (by 369g or 45 percent) and is thus easier to take along.
- Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
- Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
- Easier wireless transfer: Supports Bluetooth for image sharing without cables.
- More affordable: Was introduced into a lower priced category (58 percent cheaper at launch).
- More modern: Reflects 9 years and 10 months of technical progress since the 40D launch.
If the count of individual advantages (bullet points above) is taken as a guide, the SL2 is the clear winner of the contest (20 : 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.
How about other alternatives? Do the specifications of the Canon 40D and the Canon SL2 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 specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it says little about, for example, the shooting experience and imaging performance of the 40D and the SL2 in practical situations. 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.
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 (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.
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. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and comparisons of ratings among very different cameras or across long time periods have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.
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.
Specifications: Canon 40D vs Canon SL2
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 SL2|
|Camera Type||Digital single lens reflex||Digital single lens reflex|
|Camera Lens||Canon EF mount lenses||Canon EF mount lenses|
|Launch Date||August 2007||June 2017|
|Launch Price||USD 1299||USD 549|
|Sensor Specs||Canon 40D||Canon SL2|
|Sensor Format||APS-C Sensor||APS-C Sensor|
|Sensor Size||22.3 x 14.9 mm||22.3 x 14.9 mm|
|Sensor Area||332.27 mm2||332.27 mm2|
|Sensor Diagonal||26.8 mm||26.8 mm|
|Sensor Resolution||10.1 Megapixels||24 Megapixels|
|Image Resolution||3888 x 2592 pixels||6000 x 4000 pixels|
|Pixel Pitch||5.73 μm||3.72 μm|
|Pixel Density||3.03 MP/cm2||7.22 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||no Video||1080/60p Video|
|ISO Setting||100-1600 ISO||100-25600 ISO|
|ISO Boost||100-3200 ISO||100-51200 ISO|
|Image Processor||DIGIC 3||DIGIC 7|
|DXO Sensor Quality (score)||64||79|
|DXO Color Depth (bits)||22.1||23.6|
|DXO Dynamic Range (EV)||11.3||13.4|
|DXO Low Light (ISO)||703||1041|
|Screen Specs||Canon 40D||Canon SL2|
|Viewfinder Type||Optical viewfinder||Optical viewfinder|
|Viewfinder Field of View||95%||95%|
|Top-Level Screen||Control Panel||no Top Display|
|LCD Framing||Live View||Live View|
|Rear LCD Size||3.0 inch||3.0 inch|
|LCD Resolution||230k dots||1040k dots|
|LCD Attachment||Fixed screen||Swivel screen|
|Touch Input||no Touchscreen||Touchscreen|
|Shooting Specs||Canon 40D||Canon SL2|
|Focus System||Phase-detect AF||Phase-detect AF|
|Continuous Shooting||6.5 shutter flaps/s||5 shutter flaps/s|
|Shutter Life Expectancy||100 000 actuations||100 000 actuations|
|Time-Lapse Photography||no Intervalometer||Intervalometer built-in|
|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 SL2|
|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|
|Near-Field Communication||no NFC||NFC built-in|
|Bluetooth Support||no Bluetooth||Bluetooth built-in|
|Body Specs||Canon 40D||Canon SL2|
|Battery Life (CIPA)||750 shots per charge||650 shots per charge|
146 x 108 x 74 mm
(5.7 x 4.3 x 2.9 in)
122 x 93 x 70 mm
(4.8 x 3.7 x 2.8 in)
|Camera Weight||822 g (29.0 oz)||453 g (16.0 oz)|
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