Canon T3i vs Olympus E-PM1
The Canon EOS Rebel T3i (called Canon 600D in some regions) and the Olympus PEN E-PM1 are two digital cameras that were announced, respectively, in February 2011 and June 2011. The T3i is a DSLR, while the E-PM1 is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (T3i) and a Four Thirds (E-PM1) sensor. The Canon has a resolution of 17.9 megapixels, whereas the Olympus provides 12.2 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 T3i and the Olympus PEN E-PM1? 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 T3i and the Olympus E-PM1. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All width, height and depth dimensions are rounded to the nearest millimeter.
The E-PM1 can be obtained in six different colors (black, silver, brown, pink, purple, white), while the T3i 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 Olympus E-PM1 is considerably smaller (47 percent) than the Canon T3i. Moreover, the E-PM1 is substantially lighter (54 percent) than the T3i. In this context, it is worth noting that neither the T3i nor the E-PM1 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 (T3i) and the Micro Four Thirds Lens Catalog (E-PM1). Mirrorless cameras, such as the E-PM1, have moreover the advantage that they can use many lenses from other systems via adapters, as they have a relatively short flange to focal plane distance.
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.
|1.||Canon T3i||133 mm||100 mm||80 mm||570 g||440||n||Feb 2011||599|
|2.||Olympus E-PM1||110 mm||64 mm||34 mm||265 g||330||n||Jun 2011||499|
|3.||Canon SL2||122 mm||93 mm||70 mm||453 g||650||n||Jun 2017||549|
|4.||Canon T6s||132 mm||101 mm||78 mm||565 g||440||n||Feb 2015||649|
|5.||Canon T5||130 mm||100 mm||78 mm||480 g||500||n||Feb 2014||449|
|6.||Canon SL1||117 mm||91 mm||69 mm||407 g||380||n||Mar 2013||549|
|7.||Canon T5i||133 mm||100 mm||79 mm||580 g||440||n||Mar 2013||649|
|8.||Canon M||109 mm||66 mm||32 mm||298 g||230||n||Jul 2012||599|
|9.||Canon T4i||133 mm||100 mm||79 mm||575 g||440||n||Jun 2012||849|
|10.||Canon T3||130 mm||100 mm||78 mm||495 g||700||n||Feb 2011||449|
|11.||Canon T2i||129 mm||98 mm||62 mm||530 g||440||n||Feb 2010||699|
|12.||Canon T1i||129 mm||98 mm||62 mm||520 g||400||n||Mar 2009||799|
|13.||Olympus E-PM2||110 mm||64 mm||34 mm||269 g||360||n||Sep 2012||499|
|14.||Olympus E-PL2||114 mm||72 mm||42 mm||362 g||280||n||Jan 2011||599|
|15.||Olympus E-PL3||110 mm||64 mm||37 mm||313 g||300||n||Jun 2011||599|
|16.||Olympus E-PL1||115 mm||72 mm||42 mm||334 g||290||n||Feb 2010||599|
|17.||Panasonic G2||124 mm||84 mm||74 mm||428 g||360||n||Mar 2010||599|
|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 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 E-PM1 was launched at a somewhat lower price (by 17 percent) than the T3i, which makes it more attractive for photographers on a tight budget. 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 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 T3i features an APS-C sensor and the Olympus E-PM1 a Four Thirds sensor. The sensor area in the E-PM1 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 T3i has a native 3:2 aspect ratio, while the one in the E-PM1 offers a 4:3 aspect.
With 17.9MP, the T3i offers a higher resolution than the E-PM1 (12.2MP), but the T3i nevertheless has marginally larger individual pixels (pixel pitch of 4.31μm versus 4.29μm for the E-PM1) due to its larger sensor. However, the E-PM1 is a somewhat more recent model (by 4 months) than the T3i, 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 T3i implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the T3i 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-PM1 are 20.2 x 15.1 inches or 51.2 x 38.4 cm for good quality, 16.1 x 12.1 inches or 41 x 30.7 cm for very good quality, and 13.4 x 10.1 inches or 34.1 x 25.6 cm for excellent quality prints.
The Canon EOS Rebel T3i 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 PEN E-PM1 are ISO 100 to ISO 12800 (no boost).
Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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 T3i provides substantially higher image quality than the E-PM1, with an overall score that is 13 points higher. This advantage is based on 1.1 bits higher color depth, 1.2 EV in additional dynamic range, and 0.7 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.
| DXO |
|2.||Olympus E-PM1||Four Thirds||12.2||4032||3024||1080/60i||21.0||10.3||499||52|
|13.||Olympus E-PM2||Four Thirds||15.9||4608||3456||1080/30p||22.7||12.2||932||72|
|14.||Olympus E-PL2||Four Thirds||12.2||4032||3024||720/30p||21.4||10.2||573||55|
|15.||Olympus E-PL3||Four Thirds||12.2||4032||3024||1080/60i||20.9||10.3||499||52|
|16.||Olympus E-PL1||Four Thirds||12.2||4032||3024||720/30p||21.5||10.1||487||54|
|17.||Panasonic G2||Four Thirds||12.0||4000||3000||720/30p||21.2||10.3||493||53|
Many modern cameras are not only capable of taking still images, but can also record movies. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the E-PM1 provides a faster frame rate than the T3i. It can shoot movie footage at 1080/60i, while the Canon is limited to 1080/30p.
Apart from body and sensor, cameras can and do differ across a range of features. For example, the T3i has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the E-PM1 relies on live view and the rear LCD for framing. That said, the E-PM1 can be equipped with an optional viewfinder – the VF-2. The following table reports on some other key feature differences and similarities of the Canon T3i, the Olympus E-PM1, and comparable cameras.
One difference between the cameras concerns the presence of an on-board flash. The T3i has one, while the E-PM1 does not. While the built-in flash of the T3i is not very powerful, it can at times be useful as a fill-in light.The T3i 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-PM1 does not have a selfie-screen.
Concerning the storage of imaging data, both the T3i and the E-PM1 write their files to 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 Rebel T3i and Olympus PEN E-PM1 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
| WiFi |
| NFC |
It is notable that the T3i has a microphone port, which is missing on the E-PM1. Such an external microphone input can help to substantially improve the quality of audio recordings when a good external microphone is used.
Both the T3i and the E-PM1 have been discontinued, but can regularly be found used on eBay. The T3i was replaced by the Canon T4i, while the E-PM1 was followed by the Olympus E-PM2. 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 how do things add up? Is the Canon T3i better than the Olympus E-PM1 or vice versa? The listing below highlights the relative strengths of the two models.
Arguments in favor of the Canon EOS Rebel T3i:
- More detail: Offers more megapixels (17.9 vs 12.2MP) with a 24% higher linear resolution.
- Better image quality: Scores substantially higher (13 points) in the DXO overall assessment.
- Richer colors: Generates images with noticeably better colors (1.1 bits more color depth).
- More dynamic range: Captures a larger spectrum of light and dark details (1.2 EV of extra DR).
- Better low-light sensitivity: Requires less light for good images (0.7 stops ISO advantage).
- Better sound: Can connect to an external microphone for higher quality sound recording.
- Easier framing: Has an optical viewfinder for image composition and settings control.
- More detailed LCD: Has a higher resolution rear screen (1040k vs 460k dots).
- More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
- More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
- Longer lasting: Can take more shots (440 versus 330) on a single battery charge.
- Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
- More heavily discounted: Has been on the market for longer (launched in February 2011).
Reasons to prefer the Olympus PEN E-PM1:
- Better video: Provides higher movie framerates (1080/60i versus 1080/30p).
- Faster burst: Shoots at higher frequency (5.5 vs 3.7 flaps/sec) to capture the decisive moment.
- More compact: Is smaller (110x64mm vs 133x100mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight (by 305g or 54 percent) and is thus easier to take along.
- Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
- More legacy lens friendly: Can use many non-native lenses via adapters.
- More affordable: Was released into a lower priced segment (17 percent cheaper at launch).
- More modern: Was introduced somewhat (4 months) more recently.
If the count of individual advantages (bullet points above) is taken as a guide, the T3i is the clear winner of the match-up (13 : 8 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 T3i and the Olympus E-PM1 place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens 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 T3i and the E-PM1 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.
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.
|1.||Canon T3i||3/5||o||77/100||4.5/5||4.5/5||Feb 2011||599|
|2.||Olympus E-PM1||..||86/100||71/100||4.5/5||4.5/5||Jun 2011||499|
|3.||Canon SL2||4/5||+ +||78/100||4.5/5||4.5/5||Jun 2017||549|
|4.||Canon T6s||5/5||+||77/100||4.5/5||4.5/5||Feb 2015||649|
|5.||Canon T5||3/5||+||..||4/5||4.5/5||Feb 2014||449|
|6.||Canon SL1||4/5||+||78/100||4/5||4/5||Mar 2013||549|
|7.||Canon T5i||..||..||76/100||4.5/5||4.5/5||Mar 2013||649|
|8.||Canon M||3/5||+||..||4/5||4/5||Jul 2012||599|
|9.||Canon T4i||4/5||+ +||77/100||4.5/5||4.5/5||Jun 2012||849|
|10.||Canon T3||..||80/100||69/100||4/5||4.5/5||Feb 2011||449|
|11.||Canon T2i||..||+ +||77/100||4/5||4.5/5||Feb 2010||699|
|12.||Canon T1i||..||+ +||74/100||4.5/5||4.5/5||Mar 2009||799|
|13.||Olympus E-PM2||3/5||..||77/100||5/5||4.5/5||Sep 2012||499|
|14.||Olympus E-PL2||3/5||83/100||71/100||4.5/5||4.5/5||Jan 2011||599|
|15.||Olympus E-PL3||3/5||+ +||72/100||4.5/5||4/5||Jun 2011||599|
|16.||Olympus E-PL1||..||86/100||69/100||4/5||4.5/5||Feb 2010||599|
|17.||Panasonic G2||..||..||72/100||4/5||4.5/5||Mar 2010||599|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
The above review scores should be interpreted 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 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.
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. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.
Specifications: Canon T3i vs Olympus E-PM1
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 T3i||Olympus E-PM1|
|Camera Type||Digital single lens reflex||Mirrorless system camera|
|Camera Lens||Canon EF mount lenses||Micro Four Thirds lenses|
|Launch Date||February 2011||June 2011|
|Launch Price||USD 599||USD 499|
|Sensor Specs||Canon T3i||Olympus E-PM1|
|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||12.2 Megapixels|
|Image Resolution||5184 x 3456 pixels||4032 x 3024 pixels|
|Pixel Pitch||4.31 μm||4.29 μm|
|Pixel Density||5.39 MP/cm2||5.42 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||1080/30p Video||1080/60i Video|
|ISO Setting||100 - 6,400 ISO||100 - 12,800 ISO|
|ISO Boost||100 - 12,800 ISO||no Enhancement|
|Image Processor||DIGIC 4||TruePic VI|
|DXO Sensor Quality (score)||65||52|
|DXO Color Depth (bits)||22.1||21.0|
|DXO Dynamic Range (EV)||11.5||10.3|
|DXO Low Light (ISO)||793||499|
|Screen Specs||Canon T3i||Olympus E-PM1|
|Viewfinder Type||Optical viewfinder||Viewfinder optional|
|Viewfinder Field of View||95%|
|LCD Framing||Live View||Live View|
|Rear LCD Size||3.0inch||3.0inch|
|LCD Resolution||1040k dots||460k dots|
|LCD Attachment||Swivel screen||Fixed screen|
|Shooting Specs||Canon T3i||Olympus E-PM1|
|Focus System||Phase-detect AF||Contrast-detect AF|
|Continuous Shooting||3.7 shutter flaps/s||5.5 shutter flaps/s|
|Image Stabilization||Lens stabilization only||In-body stabilization|
|Fill Flash||Build-in Flash||no On-Board Flash|
|Storage Medium||SDXC cards||SDXC cards|
|Second Storage Option||Single card slot||Single card slot|
|UHS card support||no||no|
|Connectivity Specs||Canon T3i||Olympus E-PM1|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||mini HDMI||mini HDMI|
|Microphone Port||External MIC port||no MIC socket|
|Wifi Support||no Wifi||no Wifi|
|Body Specs||Canon T3i||Olympus E-PM1|
|Battery Life (CIPA)||440 shots per charge||330 shots per charge|
133 x 100 x 80 mm
(5.2 x 3.9 x 3.1 in)
110 x 64 x 34 mm
(4.3 x 2.5 x 1.3 in)
|Camera Weight||570 g (20.1 oz)||265 g (9.3 oz)|
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