Canon T7i vs Olympus E-400
The Canon EOS Rebel T7i (called Canon 800D in some regions) and the Olympus E-400 are two digital cameras that were officially introduced, respectively, in February 2017 and September 2006. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (T7i) and a Four Thirds (E-400) sensor. The Canon has a resolution of 24 megapixels, whereas the Olympus provides 10 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.
Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS Rebel T7i and the Olympus E-400? 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 T7i and the Olympus E-400 is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All size 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 Olympus E-400 is notably smaller (10 percent) than the Canon T7i. Moreover, the E-400 is markedly lighter (18 percent) than the T7i. In this context, it is worth noting that neither the T7i nor the E-400 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. A larger imaging sensor will tend to go along with bigger and heavier lenses, although exceptions exist. You can compare the optics available for the two cameras in the Canon EF Lens Catalog (T7i) and the Four Thirds Lens Catalog (E-400).
The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. 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.
|1.||Canon T7i||131 mm||100 mm||76 mm||532 g||600||n||Feb 2017||749||ebay.com|
|2.||Olympus E-400||130 mm||91 mm||53 mm||435 g||500||n||Sep 2006||699||ebay.com|
|3.||Canon T8i||131 mm||103 mm||76 mm||515 g||800||n||Feb 2020||749||amazon.com|
|4.||Canon T7||129 mm||101 mm||78 mm||475 g||500||n||Feb 2018||449||amazon.com|
|5.||Canon 77D||131 mm||100 mm||76 mm||540 g||600||n||Feb 2017||899||ebay.com|
|6.||Canon SL2||122 mm||93 mm||70 mm||453 g||650||n||Jun 2017||549||ebay.com|
|7.||Canon T6i||132 mm||101 mm||78 mm||555 g||440||n||Feb 2015||749||ebay.com|
|8.||Canon T6s||132 mm||101 mm||78 mm||565 g||440||n||Feb 2015||649||ebay.com|
|9.||Canon T5i||133 mm||100 mm||79 mm||580 g||440||n||Mar 2013||649||ebay.com|
|10.||Canon T4i||133 mm||100 mm||79 mm||575 g||440||n||Jun 2012||849||ebay.com|
|11.||Canon T2i||129 mm||98 mm||62 mm||530 g||440||n||Feb 2010||699||ebay.com|
|12.||Canon T1i||129 mm||98 mm||62 mm||520 g||400||n||Mar 2009||799||ebay.com|
|13.||Olympus E-420||130 mm||91 mm||53 mm||440 g||500||n||Mar 2008||599||ebay.com|
|14.||Olympus E-410||130 mm||91 mm||53 mm||435 g||500||n||Mar 2007||699||ebay.com|
|15.||Olympus E-510||136 mm||92 mm||68 mm||538 g||750||n||Mar 2007||799||ebay.com|
|16.||Olympus E-500||130 mm||95 mm||66 mm||479 g||750||n||Sep 2005||599||ebay.com|
|17.||Panasonic L10||135 mm||96 mm||78 mm||556 g||450||n||Aug 2007||599||ebay.com|
|Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.|
Any camera decision will obviously take relative prices into account. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The E-400 was somewhat cheaper (by 7 percent) than the T7i at launch, but both cameras fall into the same price category. 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. 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. 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. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better 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 T7i features an APS-C sensor and the Olympus E-400 a Four Thirds sensor. The sensor area in the E-400 is 32 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.6 and 2.0. The sensor in the T7i has a native 3:2 aspect ratio, while the one in the E-400 offers a 4:3 aspect.
With 24MP, the T7i offers a higher resolution than the E-400 (10MP), but the T7i has smaller individual pixels (pixel pitch of 3.72μm versus 4.74μm for the E-400). However, the T7i is a much more recent model (by 10 years and 5 months) than the E-400, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixels.
The resolution advantage of the Canon T7i implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the T7i for good quality output (200 dots per inch) amounts to 30 x 20 inches or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inches or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inches or 50.8 x 33.9 cm. The corresponding values for the Olympus E-400 are 18.2 x 13.7 inches or 46.3 x 34.7 cm for good quality, 14.6 x 10.9 inches or 37.1 x 27.8 cm for very good quality, and 12.2 x 9.1 inches or 30.9 x 23.2 cm for excellent quality prints.
The T7i has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
The Canon EOS Rebel T7i has a native sensitivity range from ISO 100 to ISO 25600, which can be extended to ISO 100-51200. The corresponding ISO settings for the Olympus E-400 are ISO 100 to ISO 1600 (no boost).
Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.
For many cameras, data on sensor performance has been reported by DXO Mark. 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"). The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.
|2.||Olympus E-400||Four Thirds||10.0||3648||2736||none||21.0||10.6||127||53|
|13.||Olympus E-420||Four Thirds||10.0||3648||2736||none||21.5||10.4||527||56|
|14.||Olympus E-410||Four Thirds||10.0||3648||2736||none||21.1||10.0||494||51|
|15.||Olympus E-510||Four Thirds||10.0||3648||2736||none||21.2||10.0||442||52|
|16.||Olympus E-500||Four Thirds||8.0||3264||2448||none||20.7||10.3||45||51|
|17.||Panasonic L10||Four Thirds||10.0||3648||2736||none||21.3||10.8||429||55|
|Note: DXO values in italics represent estimates based on sensor size and age.|
Many modern cameras are not only capable of taking still images, but can also record movies. The T7i indeed provides movie recording capabilities, while the E-400 does not. The highest resolution format that the T7i can use is 1080/60p.
Apart from body and sensor, cameras can and do differ across a range of features. The T7i and the E-400 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 T7i has a higher magnification than the one of the E-400 (0.51x vs 0.46x), 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 T7i and Olympus E-400 along with similar information for a selection of comparators.
|1.||Canon T7i||optical||n||3.0 / 1040||swivel||Y||1/4000s||6.0/s||Y||n|
|2.||Olympus E-400||optical||n||2.5 / 215||fixed||n||1/4000s||3.0/s||Y||n|
|3.||Canon T8i||optical||n||3.0 / 1040||swivel||Y||1/4000s||7.5/s||Y||n|
|4.||Canon T7||optical||n||3.0 / 920||fixed||n||1/4000s||3.0/s||Y||n|
|5.||Canon 77D||optical||Y||3.0 / 1040||swivel||Y||1/4000s||6.0/s||Y||n|
|6.||Canon SL2||optical||n||3.0 / 1040||swivel||Y||1/4000s||5.0/s||Y||n|
|7.||Canon T6i||optical||n||3.0 / 1040||swivel||Y||1/4000s||5.0/s||Y||n|
|8.||Canon T6s||optical||Y||3.0 / 1040||swivel||Y||1/4000s||5.0/s||Y||n|
|9.||Canon T5i||optical||n||3.0 / 1040||swivel||Y||1/4000s||5.0/s||Y||n|
|10.||Canon T4i||optical||n||3.0 / 1040||swivel||Y||1/4000s||5.0/s||Y||n|
|11.||Canon T2i||optical||n||3.0 / 1040||fixed||n||1/4000s||3.7/s||Y||n|
|12.||Canon T1i||optical||n||3.0 / 920||fixed||n||1/4000s||3.4/s||Y||n|
|13.||Olympus E-420||optical||n||2.7 / 215||fixed||n||1/4000s||3.5/s||Y||n|
|14.||Olympus E-410||optical||n||2.5 / 215||fixed||n||1/4000s||3.0/s||Y||n|
|15.||Olympus E-510||optical||n||2.5 / 215||fixed||n||1/4000s||3.0/s||Y||Y|
|16.||Olympus E-500||optical||n||2.5 / 215||fixed||n||1/4000s||2.5/s||Y||n|
|17.||Panasonic L10||optical||n||2.5 / 207||swivel||n||1/4000s||3.0/s||Y||n|
|Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.|
One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The T7i has a touchscreen, while the E-400 has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.The T7i has an articulated LCD that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in snapping selfies. In contrast, the E-400 does not have a selfie-screen.
The T7i writes its imaging data to SDXC cards, while the E-400 uses Compact Flash or xD Picture cards. The E-400 features dual card slots, which can be very useful in case a memory card fails. In contrast, the T7i only has one slot.
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 Rebel T7i and Olympus E-400 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
Mic / Speaker
|1.||Canon T7i||Y||stereo / mono||Y||-||mini||2.0||Y||Y||Y|
|2.||Olympus E-400||Y||- / -||-||-||-||2.0||-||-||-|
|3.||Canon T8i||Y||stereo / mono||Y||-||mini||2.0||Y||-||Y|
|4.||Canon T7||Y||mono / mono||-||-||mini||2.0||Y||Y||-|
|5.||Canon 77D||Y||stereo / mono||Y||-||mini||2.0||Y||Y||Y|
|6.||Canon SL2||Y||stereo / mono||Y||-||mini||2.0||Y||Y||Y|
|7.||Canon T6i||Y||stereo / mono||Y||-||mini||2.0||Y||Y||-|
|8.||Canon T6s||Y||stereo / mono||Y||-||mini||2.0||Y||Y||-|
|9.||Canon T5i||Y||stereo / mono||Y||-||mini||2.0||-||-||-|
|10.||Canon T4i||Y||stereo / mono||Y||-||mini||2.0||-||-||-|
|11.||Canon T2i||Y||stereo / -||Y||-||mini||2.0||-||-||-|
|12.||Canon T1i||Y||mono / mono||-||-||mini||2.0||-||-||-|
|13.||Olympus E-420||Y||- / -||-||-||-||2.0||-||-||-|
|14.||Olympus E-410||Y||- / -||-||-||-||2.0||-||-||-|
|15.||Olympus E-510||Y||- / -||-||-||-||2.0||-||-||-|
|16.||Olympus E-500||Y||- / -||-||-||-||2.0||-||-||-|
|17.||Panasonic L10||Y||- / -||-||-||-||2.0||-||-||-|
It is notable that the T7i offers wifi support, while the E-400 does not. Wifi can be a very convenient means to transfer image data to an off-camera location.
Both the T7i and the E-400 have been discontinued, but can regularly be found used on ebay. The E-400 was replaced by the Olympus E-410, while the T7i was followed by the Canon T8i. Further information on the features and operation of the T7i and E-400 can be found, respectively, in the Canon T7i Manual (free pdf) or the online Olympus E-400 Manual.
So what is the bottom line? Is the Canon T7i better than the Olympus E-400 or vice versa? Below is a summary of the relative strengths of each of the two contestants.
Arguments in favor of the Canon EOS Rebel T7i:
- More detail: Offers more megapixels (24 vs 10MP) with a 58% higher linear resolution.
- Better image quality: Features a larger and more technologically advanced imaging sensor.
- Richer colors: The sensor size advantage translates into images with better, more accurate colors.
- More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
- Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
- Broader imaging potential: Can record not only still images but also 1080/60p movies.
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.51x vs 0.46x).
- 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 (1040k vs 215k dots).
- More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
- Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
- More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
- Faster burst: Shoots at higher frequency (6 vs 3 flaps/sec) to capture the decisive moment.
- Longer lasting: Can take more shots (600 versus 500) on a single battery charge.
- 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 modern: Reflects 10 years and 5 months of technical progress since the E-400 launch.
Advantages of the Olympus E-400:
- Less heavy: Has a lower weight (by 97g or 18 percent) and is thus easier to take along.
- Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
- More heavily discounted: Has been around for much longer (launched in September 2006).
If the number of relative strengths (bullet points above) is taken as a guide, the T7i is the clear winner of the match-up (19 : 3 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision 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 T7i and the Olympus E-400 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 remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the T7i or the E-400. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.
This is why hands-on reviews by experts are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear 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.
|1.||Canon T7i||4.5/5||..||3.5/5||80/100||4.5/5||4/5||Feb 2017||749||ebay.com|
|2.||Olympus E-400||..||85/100||..||..||4/5||4/5||Sep 2006||699||ebay.com|
|3.||Canon T8i||4.5/5||+||3/5||80/100||4/5||3.5/5||Feb 2020||749||amazon.com|
|4.||Canon T7||..||o||3.5/5||..||3.5/5||3.5/5||Feb 2018||449||amazon.com|
|5.||Canon 77D||4.5/5||..||4/5||82/100||4.5/5||4/5||Feb 2017||899||ebay.com|
|6.||Canon SL2||4/5||+ +||4/5||78/100||4.5/5||4.5/5||Jun 2017||549||ebay.com|
|7.||Canon T6i||5/5||..||..||75/100||4.5/5||4.5/5||Feb 2015||749||ebay.com|
|8.||Canon T6s||5/5||+||..||77/100||4.5/5||4.5/5||Feb 2015||649||ebay.com|
|9.||Canon T5i||..||..||..||76/100||4.5/5||4.5/5||Mar 2013||649||ebay.com|
|10.||Canon T4i||4/5||+ +||..||77/100||4.5/5||4.5/5||Jun 2012||849||ebay.com|
|11.||Canon T2i||..||+ +||..||77/100||4/5||4.5/5||Feb 2010||699||ebay.com|
|12.||Canon T1i||..||+ +||..||74/100||4.5/5||4.5/5||Mar 2009||799||ebay.com|
|13.||Olympus E-420||..||85/100||..||+ +||4/5||4.5/5||Mar 2008||599||ebay.com|
|14.||Olympus E-410||..||86/100||..||+ +||4/5||4.5/5||Mar 2007||699||ebay.com|
|15.||Olympus E-510||..||89/100||..||+ +||3.5/5||4.5/5||Mar 2007||799||ebay.com|
|16.||Olympus E-500||..||76/100||..||+ +||..||..||Sep 2005||599||ebay.com|
|17.||Panasonic L10||..||85/100||..||+||3.5/5||4/5||Aug 2007||599||ebay.com|
|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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparisons of ratings among very different cameras or across long time periods 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 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.
- Canon 250D vs Canon T7i
- Canon 550D vs Canon T7i
- Canon D60 vs Canon T7i
- Canon SX410 vs Olympus E-400
- Canon T7i vs Olympus E-PL7
- Canon T7i vs Pentax 645Z
- Canon T7i vs Sony RX1R
- Nikon D3100 vs Olympus E-400
- Nikon D3400 vs Olympus E-400
- Nikon D850 vs Olympus E-400
- Olympus E-400 vs Sony HX350
- Olympus E-400 vs Sony HX400V
Specifications: Canon T7i vs Olympus E-400
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 T7i||Olympus E-400|
|Camera Type||Digital single lens reflex||Digital single lens reflex|
|Camera Lens||Canon EF mount lenses||Four Thirds lenses|
|Launch Date||February 2017||September 2006|
|Launch Price||USD 749||USD 699|
|Sensor Specs||Canon T7i||Olympus E-400|
|Sensor Format||APS-C Sensor||Four Thirds Sensor|
|Sensor Size||22.3 x 14.9 mm||17.3 x 13.0 mm|
|Sensor Area||332.27 mm2||224.9 mm2|
|Sensor Diagonal||26.8 mm||21.6 mm|
|Sensor Resolution||24 Megapixels||10 Megapixels|
|Image Resolution||6000 x 4000 pixels||3648 x 2736 pixels|
|Pixel Pitch||3.72 μm||4.74 μm|
|Pixel Density||7.22 MP/cm2||4.44 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||1080/60p Video||no Video|
|ISO Setting||100 - 25,600 ISO||100 - 1,600 ISO|
|ISO Boost||100 - 51,200 ISO||no Enhancement|
|Image Processor||DIGIC 7||TruePic|
|Screen Specs||Canon T7i||Olympus E-400|
|Viewfinder Type||Optical viewfinder||Optical viewfinder|
|Viewfinder Field of View||95%||95%|
|LCD Framing||Live View|
|Rear LCD Size||3.0inch||2.5inch|
|LCD Resolution||1040k dots||215k dots|
|LCD Attachment||Swivel screen||Fixed screen|
|Touch Input||Touchscreen||no Touchscreen|
|Shooting Specs||Canon T7i||Olympus E-400|
|Focus System||Phase-detect AF||Phase-detect AF|
|Continuous Shooting||6 shutter flaps/s||3 shutter flaps/s|
|Fill Flash||Built-in Flash||Built-in Flash|
|Storage Medium||SDXC cards||CF or XD cards|
|Single or Dual Card Slots||Single card slot||Dual card slots|
|Connectivity Specs||Canon T7i||Olympus E-400|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||mini HDMI||no HDMI|
|Microphone Port||External MIC port||no MIC socket|
|Wifi Support||Wifi built-in||no Wifi|
|Near-Field Communication||NFC built-in||no NFC|
|Bluetooth Support||Bluetooth built-in||no Bluetooth|
|Body Specs||Canon T7i||Olympus E-400|
|Battery Life (CIPA)||600 shots per charge||500 shots per charge|
131 x 100 x 76 mm
(5.2 x 3.9 x 3.0 in)
130 x 91 x 53 mm
(5.1 x 3.6 x 2.1 in)
|Camera Weight||532 g (18.8 oz)||435 g (15.3 oz)|
Did you notice an error on this page? If so, please get in touch, so that we can correct the information.