Canon 7D vs Olympus E-420
The Canon EOS 7D and the Olympus E-420 are two digital cameras that were officially introduced, respectively, in September 2009 and March 2008. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (7D) and a Four Thirds (E-420) sensor. The Canon has a resolution of 17.9 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 7D and the Olympus E-420? 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 7D and the Olympus E-420 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-420 is notably smaller (28 percent) than the Canon 7D. Moreover, the E-420 is substantially lighter (49 percent) than the 7D. It is worth mentioning in this context that the 7D is splash and dust resistant, while the E-420 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 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 (7D) and the Four Thirds Lens Catalog (E-420).
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 7D||148 mm||111 mm||74 mm||860 g||800||Y||Sep 2009||1,699|
|2.||Olympus E-420||130 mm||91 mm||53 mm||440 g||500||n||Mar 2008||599|
|3.||Canon 80D||139 mm||105 mm||79 mm||730 g||960||Y||Feb 2016||1,199|
|4.||Canon G3 X||123 mm||77 mm||105 mm||733 g||300||Y||Jun 2015||999|
|5.||Canon 7D II||149 mm||112 mm||78 mm||910 g||670||Y||Sep 2014||1,799|
|6.||Canon 70D||139 mm||104 mm||79 mm||755 g||920||Y||Jul 2013||1,199|
|7.||Canon 60D||145 mm||106 mm||79 mm||755 g||1100||Y||Aug 2010||1,399|
|8.||Canon 1D Mark IV||156 mm||157 mm||80 mm||1230 g||1500||Y||Oct 2009||4,999|
|9.||Canon 5D Mark II||152 mm||114 mm||75 mm||850 g||850||Y||Sep 2008||3,499|
|10.||Canon 50D||146 mm||108 mm||74 mm||822 g||800||Y||Aug 2008||1,299|
|11.||Nikon D7000||132 mm||105 mm||77 mm||780 g||1050||Y||Sep 2010||1,499|
|12.||Olympus E-450||130 mm||91 mm||53 mm||440 g||500||n||Mar 2009||499|
|13.||Olympus E-620||130 mm||94 mm||60 mm||521 g||500||n||Feb 2009||699|
|14.||Olympus E-520||136 mm||92 mm||68 mm||535 g||750||n||May 2008||699|
|15.||Olympus E-410||130 mm||91 mm||53 mm||435 g||500||n||Mar 2007||699|
|16.||Olympus E-400||130 mm||91 mm||53 mm||435 g||500||n||Sep 2006||699|
|17.||Sony RX10 III||133 mm||94 mm||127 mm||1051 g||420||Y||Mar 2016||1,499|
|Notes: 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-420 was launched at a markedly lower price (by 65 percent) than the 7D, 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. 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 7D features an APS-C sensor and the Olympus E-420 a Four Thirds sensor. The sensor area in the E-420 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 7D has a native 3:2 aspect ratio, while the one in the E-420 offers a 4:3 aspect.
With 17.9MP, the 7D offers a higher resolution than the E-420 (10MP), but the 7D has smaller individual pixels (pixel pitch of 4.31μm versus 4.74μm for the E-420). However, the 7D is a somewhat more recent model (by 1 year and 5 months) than the E-420, and its sensor might have benefitted from technological advances during this time that enhance the light gathering capacity of its pixels.
The resolution advantage of the Canon 7D implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 7D for good quality output (200 dots per inch) amounts to 25.9 x 17.3 inches or 65.8 x 43.9 cm, for very good quality (250 dpi) 20.7 x 13.8 inches or 52.7 x 35.1 cm, and for excellent quality (300 dpi) 17.3 x 11.5 inches or 43.9 x 29.3 cm. The corresponding values for the Olympus E-420 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 Canon EOS 7D has a native sensitivity range from ISO 100 to ISO 6400, which can be extended to ISO 100-12800. The corresponding ISO settings for the Olympus E-420 are ISO 100 to ISO 1600 (no boost).
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"). Of the two cameras under review, the 7D has a notably higher overall DXO score than the E-420 (overall score 10 points higher), which gives it an advantage in terms of imaging quality. This advantage is based on 0.5 bits higher color depth, 1.3 EV in additional dynamic range, and 0.7 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.
| DXO |
|2.||Olympus E-420||Four Thirds||10.0||3648||2736||none||21.5||10.4||527||56|
|4.||Canon G3 X||1-inch||20.0||5472||3648||1080/60p||21.4||12.3||521||63|
|5.||Canon 7D II||APS-C||20.0||5472||3648||1080/60p||22.4||11.8||1082||70|
|8.||Canon 1D Mark IV||APS-H||16.0||4896||3264||1080/30p||22.8||12.0||1320||74|
|9.||Canon 5D Mark II||Full Frame||21.0||5616||3744||1080/30p||23.7||11.9||1815||79|
|12.||Olympus E-450||Four Thirds||10.0||3648||2736||none||21.5||10.5||512||56|
|13.||Olympus E-620||Four Thirds||12.2||4032||3024||none||21.3||10.3||536||55|
|14.||Olympus E-520||Four Thirds||10.0||3648||2736||none||21.4||10.4||548||55|
|15.||Olympus E-410||Four Thirds||10.0||3648||2736||none||21.1||10.0||494||51|
|16.||Olympus E-400||Four Thirds||10.0||3648||2736||none||..||..||..||..|
|17.||Sony RX10 III||1-inch||20.0||5472||3648||4K/30p||23.1||12.6||472||70|
Many modern cameras are not only capable of taking still images, but can also record movies. The 7D indeed provides movie recording capabilities, while the E-420 does not. The highest resolution format that the 7D can use is 1080/30p.
Apart from body and sensor, cameras can and do differ across a range of features. The 7D and the E-420 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 7D offers a wider field of view (100%) than the one in the E-420 (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the 7D has a higher magnification (0.63x 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 7D and Olympus E-420 along with similar information for a selection of comparators.
|4.||Canon G3 X||optional||n||3.2||1620||tilting||Y||1/2000s||5.9||Y||Y|
|5.||Canon 7D II||optical||Y||3.0||1040||fixed||n||1/8000s||10.0||Y||n|
|8.||Canon 1D Mark IV||optical||Y||3.0||920||fixed||n||1/8000s||10.0||n||n|
|9.||Canon 5D Mark II||optical||Y||3.0||920||fixed||n||1/8000s||3.9||n||n|
|17.||Sony RX10 III||2359||Y||3.0||1229||tilting||n||1/2000s||14.0||Y||Y|
One feature that is present on the 7D, but is missing on the E-420 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 7D writes its imaging data to Compact Flash cards, while the E-420 uses Compact Flash or xD Picture cards. The E-420 features dual card slots, which can be very useful in case a memory card fails. In contrast, the 7D 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 7D and Olympus E-420 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
| WiFi |
| NFC |
|4.||Canon G3 X||Y||stereo||mono||Y||Y||mini||2.0||Y||Y||-|
|5.||Canon 7D II||Y||stereo||mono||Y||Y||mini||3.0||-||-||-|
|8.||Canon 1D Mark IV||Y||stereo||-||Y||-||mini||2.0||-||-||-|
|9.||Canon 5D Mark II||Y||mono||mono||Y||-||mini||2.0||-||-||-|
|17.||Sony RX10 III||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-|
Studio photographers will appreciate that the Canon 7D (unlike the E-420) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
Both the 7D and the E-420 have been discontinued, but can regularly be found used on eBay. The 7D was replaced by the Canon 7D Mark II, while the E-420 does not have a direct successor. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon and Olympus websites.
So what is the bottom line? Is the Canon 7D better than the Olympus E-420 or vice versa? Below is a summary of the relative strengths of each of the two contestants.
Arguments in favor of the Canon EOS 7D:
- More detail: Offers more megapixels (17.9 vs 10MP) with a 37% higher linear resolution.
- Better image quality: Scores markedly higher (10 points) in the DXO overall assessment.
- More dynamic range: Captures a larger spectrum of light and dark details (1.3 EV of extra DR).
- Better low-light sensitivity: Requires less light for good images (0.7 stops ISO advantage).
- Broader imaging potential: Can record not only still images but also 1080/30p movies.
- More complete view: Has a viewfinder with a larger field of view (100% vs 95%).
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.63x vs 0.46x).
- Easier setting verification: Features an LCD display on top to control shooting parameters.
- Larger screen: Has a bigger rear LCD (3.0" vs 2.7") for image review and settings control.
- More detailed LCD: Has a higher resolution rear screen (920k vs 215k dots).
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- Faster burst: Shoots at higher frequency (8 vs 3.5 flaps/sec) to capture the decisive moment.
- Longer lasting: Can take more shots (800 versus 500) on a single battery charge.
- Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
- Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
- More modern: Is somewhat more recent (announced 1 year and 5 months after the E-420).
Advantages of the Olympus E-420:
- More compact: Is smaller (130x91mm vs 148x111mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight (by 420g or 49 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 affordable: Was introduced into a lower priced category (65 percent cheaper at launch).
- More heavily discounted: Has been on the market for longer (launched in March 2008).
If the number of relative strengths (bullet points above) is taken as a guide, the 7D is the clear winner of the match-up (16 : 5 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 7D and the Olympus E-420 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 7D or the E-420. 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], 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 7D||5/5||+ +||84/100||4.5/5||4.5/5||Sep 2009||1,699|
|2.||Olympus E-420||..||85/100||+ +||4/5||4.5/5||Mar 2008||599|
|3.||Canon 80D||4/5||+ +||84/100||4.5/5||4.5/5||Feb 2016||1,199|
|4.||Canon G3 X||3.5/5||+||..||4.5/5||4/5||Jun 2015||999|
|5.||Canon 7D II||4.5/5||+||84/100||4/5||4.5/5||Sep 2014||1,799|
|6.||Canon 70D||5/5||+ +||83/100||4.5/5||5/5||Jul 2013||1,199|
|7.||Canon 60D||5/5||+||79/100||4/5||4.5/5||Aug 2010||1,399|
|8.||Canon 1D Mark IV||5/5||..||89/100||..||..||Oct 2009||4,999|
|9.||Canon 5D Mark II||4/5||91/100||79/100||4/5||..||Sep 2008||3,499|
|10.||Canon 50D||..||+ +||+ +||4.5/5||4.5/5||Aug 2008||1,299|
|11.||Nikon D7000||4/5||..||80/100||4.5/5||4.5/5||Sep 2010||1,499|
|12.||Olympus E-450||..||..||..||4/5||4/5||Mar 2009||499|
|13.||Olympus E-620||3/5||88/100||72/100||4.5/5||5/5||Feb 2009||699|
|14.||Olympus E-520||..||87/100||+ +||4.5/5||4.5/5||May 2008||699|
|15.||Olympus E-410||..||86/100||+ +||4/5||4.5/5||Mar 2007||699|
|16.||Olympus E-400||..||85/100||..||4/5||4/5||Sep 2006||699|
|17.||Sony RX10 III||5/5||+||84/100||4.5/5||4.5/5||Mar 2016||1,499|
|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.
Specifications: Canon 7D vs Olympus E-420
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 7D||Olympus E-420|
|Camera Type||Digital single lens reflex||Digital single lens reflex|
|Camera Lens||Canon EF mount lenses||Four Thirds lenses|
|Launch Date||September 2009||March 2008|
|Launch Price||USD 1,699||USD 599|
|Sensor Specs||Canon 7D||Olympus E-420|
|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||17.9 Megapixels||10 Megapixels|
|Image Resolution||5184 x 3456 pixels||3648 x 2736 pixels|
|Pixel Pitch||4.31 μm||4.74 μm|
|Pixel Density||5.39 MP/cm2||4.44 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||1080/30p Video||no Video|
|ISO Setting||100 - 6,400 ISO||100 - 1,600 ISO|
|ISO Boost||100 - 12,800 ISO||no Enhancement|
|Image Processor||DIGIC 4 (Dual)||TruePic III|
|DXO Sensor Quality (score)||66||56|
|DXO Color Depth (bits)||22.0||21.5|
|DXO Dynamic Range (EV)||11.7||10.4|
|DXO Low Light (ISO)||854||527|
|Screen Specs||Canon 7D||Olympus E-420|
|Viewfinder Type||Optical viewfinder||Optical viewfinder|
|Viewfinder Field of View||100%||95%|
|Top-Level Screen||Control Panel||no Top Display|
|LCD Framing||Live View||Live View|
|Rear LCD Size||3.0inch||2.7inch|
|LCD Resolution||920k dots||215k dots|
|LCD Attachment||Fixed screen||Fixed screen|
|Shooting Specs||Canon 7D||Olympus E-420|
|Focus System||Phase-detect AF||Phase-detect AF|
|Continuous Shooting||8 shutter flaps/s||3.5 shutter flaps/s|
|Fill Flash||Built-in Flash||Built-in Flash|
|Storage Medium||CF cards||CF or XD cards|
|Second Storage Option||Single card slot||Dual card slots|
|Connectivity Specs||Canon 7D||Olympus E-420|
|Studio Flash||PC Sync socket||no PC Sync|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||mini HDMI||no HDMI|
|Microphone Port||External MIC port||no MIC socket|
|Wifi Support||no Wifi||no Wifi|
|Body Specs||Canon 7D||Olympus E-420|
|Environmental Sealing||Weathersealed body||not weather sealed|
|Battery Life (CIPA)||800 shots per charge||500 shots per charge|
148 x 111 x 74 mm
(5.8 x 4.4 x 2.9 in)
130 x 91 x 53 mm
(5.1 x 3.6 x 2.1 in)
|Camera Weight||860 g (30.3 oz)||440 g (15.5 oz)|
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