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Canon T3i vs Olympus E-P1

The Canon EOS Rebel T3i (called Canon 600D in some regions) and the Olympus PEN E-P1 are two digital cameras that were announced, respectively, in February 2011 and June 2009. The T3i is a DSLR, while the E-P1 is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (T3i) and a Four Thirds (E-P1) 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.

Headline Specifications
Canon T3i
versus
Olympus E-P1
Canon T3i   Olympus E-P1
Digital single lens reflex Mirrorless system camera
Canon EF mount lenses Micro Four Thirds lenses
17.9 MP, APS-C Sensor 12.2 MP, Four Thirds Sensor
1080/30p Video 720/30p Video
ISO 100-6,400 (100 - 12,800) ISO 100-6,400
Optical viewfinder No viewfinder, LCD framing
3.0 LCD, 1040k dots 3.0 LCD, 230k dots
Swivel screen (not touch-sensitive) Fixed screen (not touch-sensitive)
3.7 shutter flaps per second 3 shutter flaps per second
Lens stabilization onlyIn-body stabilization
440 shots per battery charge300 shots per battery charge
133 x 100 x 80 mm, 570 g 121 x 70 x 36 mm, 355 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS Rebel T3i and the Olympus PEN E-P1? 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.

Body comparison

An illustration of the physical size and weight of the Canon T3i and the Olympus E-P1 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 size dimensions are rounded to the nearest millimeter.

The E-P1 can be obtained in three different colors (black, silver, white), while the T3i is only available in black.

Size Canon T3i vs Olympus E-P1
Compare T3i versus E-P1 top
Comparison T3i or E-P1 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-P1 is considerably smaller (36 percent) than the Canon T3i. Moreover, the E-P1 is substantially lighter (38 percent) than the T3i. In this context, it is worth noting that neither the T3i nor the E-P1 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-P1). Mirrorless cameras, such as the E-P1, 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.

Concerning battery life, the T3i gets 440 shots out of its LP-E8 battery, while the E-P1 can take 300 images on a single charge of its BLS-1 power pack.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. 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.

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Body Specifications
    Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Canon T3i 133 mm 100 mm 80 mm 570 g 440 n Feb 2011 599i
2.
 
Olympus E-P1 121 mm 70 mm 36 mm 355 g 300 n Jun 2009 799i
3.
 
Canon SL2 122 mm 93 mm 70 mm 453 g 650 n Jun 2017 549i
4.
 
Canon T6s 132 mm 101 mm 78 mm 565 g 440 n Feb 2015 649i
5.
 
Canon T5 130 mm 100 mm 78 mm 480 g 500 n Feb 2014 449i
6.
 
Canon SL1 117 mm 91 mm 69 mm 407 g 380 n Mar 2013 549i
7.
 
Canon T5i 133 mm 100 mm 79 mm 580 g 440 n Mar 2013 649i
8.
 
Canon M 109 mm 66 mm 32 mm 298 g 230 n Jul 2012 599i
9.
 
Canon T4i 133 mm 100 mm 79 mm 575 g 440 n Jun 2012 849i
10.
 
Canon T3 130 mm 100 mm 78 mm 495 g 700 n Feb 2011 449i
11.
 
Canon T2i 129 mm 98 mm 62 mm 530 g 440 n Feb 2010 699i
12.
 
Canon T1i 129 mm 98 mm 62 mm 520 g 400 n Mar 2009 799i
13.
 
Olympus E-P3 122 mm 69 mm 34 mm 369 g 330 n Jun 2011 799i
14.
 
Olympus E-PL2 114 mm 72 mm 42 mm 362 g 280 n Jan 2011 599i
15.
 
Olympus E-PL3 110 mm 64 mm 37 mm 313 g 300 n Jun 2011 599i
16.
 
Olympus E-P2 121 mm 70 mm 36 mm 355 g 300 n Nov 2009 799i
17.
 
Panasonic GH1 124 mm 90 mm 45 mm 385 g 300 n Mar 2009 899i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

The price is, of course, an important factor in any camera decision. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The T3i was launched at a somewhat lower price (by 25 percent) than the E-P1, which makes it more attractive for photographers on a tight budget. 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.

Sensor comparison

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Canon T3i features an APS-C sensor and the Olympus E-P1 a Four Thirds sensor. The sensor area in the E-P1 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-P1 offers a 4:3 aspect.

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors.

Canon T3i and Olympus E-P1 sensor measures

With 17.9MP, the T3i offers a higher resolution than the E-P1 (12.2MP), but the T3i nevertheless has marginally larger individual pixels (pixel pitch of 4.31μm versus 4.29μm for the E-P1) due to its larger sensor. Moreover, the T3i is a somewhat more recent model (by 1 year and 7 months) than the E-P1, and its sensor might have benefitted from technological advances during this time that further 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-P1 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-P1 are ISO 100 to ISO 6400 (no boost).

T3i versus E-P1 MP

For many cameras, data on sensor performance has been reported by DXO Mark. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. Of the two cameras under review, the T3i has a notably higher overall DXO score than the E-P1 (overall score 10 points higher), which gives it an advantage in terms of imaging quality. This advantage is based on 0.7 bits higher color depth, 1.1 EV in additional dynamic range, and 0.6 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.

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Sensor Characteristics
    Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Canon T3i APS-C 17.9 5184 34561080/30p22.111.579365
2.
 
Olympus E-P1 Four Thirds 12.2 4032 3024720/30p21.410.453655
3.
 
Canon SL2 APS-C 24.0 6000 40001080/60p23.613.4104179
4.
 
Canon T6s APS-C 24.0 6000 40001080/30p22.612.091570
5.
 
Canon T5 APS-C 17.9 5184 34561080/30p21.911.372463
6.
 
Canon SL1 APS-C 17.9 5184 34561080/30p21.811.384363
7.
 
Canon T5i APS-C 17.9 5184 34561080/30p21.711.268161
8.
 
Canon M APS-C 17.9 5184 34561080/30p22.111.282765
9.
 
Canon T4i APS-C 17.9 5184 34561080/30p21.711.272262
10.
 
Canon T3 APS-C 12.2 4272 2848720/30p21.911.075562
11.
 
Canon T2i APS-C 17.9 5184 34561080/30p22.111.578466
12.
 
Canon T1i APS-C 15.1 4752 31681080/20p21.711.566363
13.
 
Olympus E-P3 Four Thirds 12.2 4032 30241080/60i20.810.153651
14.
 
Olympus E-PL2 Four Thirds 12.2 4032 3024720/30p21.410.257355
15.
 
Olympus E-PL3 Four Thirds 12.2 4032 30241080/60i20.910.349952
16.
 
Olympus E-P2 Four Thirds 12.2 4032 3024720/30p21.510.450556
17.
 
Panasonic GH1 Four Thirds 12.0 4000 30001080/24p21.611.677264

Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the T3i provides a higher video resolution than the E-P1. It can shoot video footage at 1080/30p, while the Olympus is limited to 720/30p.

Feature comparison

Beyond 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-P1 relies on live view and the rear LCD for framing. The adjacent table lists some of the other core features of the Canon T3i and Olympus E-P1 along with similar information for a selection of comparators.

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Core Features
    Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Mech
Shutter
Speed
Shutter
Flaps
(1/sec)
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Canon T3ioptical n3.0 / 1040 swivel n 1/4000s 3.7 Y n
2.
 
Olympus E-P1none n3.0 / 230 fixed n 1/4000s 3.0 n Y
3.
 
Canon SL2optical n3.0 / 1040 swivel Y 1/4000s 5.0 Y n
4.
 
Canon T6soptical Y3.0 / 1040 swivel Y 1/4000s 5.0 Y n
5.
 
Canon T5optical n3.0 / 460 fixed n 1/4000s 3.0 Y n
6.
 
Canon SL1optical n3.0 / 1040 fixed Y 1/4000s 4.9 Y n
7.
 
Canon T5ioptical n3.0 / 1040 swivel Y 1/4000s 5.0 Y n
8.
 
Canon Mnone n3.0 / 1040 fixed Y 1/4000s 4.3 n n
9.
 
Canon T4ioptical n3.0 / 1040 swivel Y 1/4000s 5.0 Y n
10.
 
Canon T3optical n2.7 / 230 fixed n 1/4000s 3.0 Y n
11.
 
Canon T2ioptical n3.0 / 1040 fixed n 1/4000s 3.7 Y n
12.
 
Canon T1ioptical n3.0 / 920 fixed n 1/4000s 3.4 Y n
13.
 
Olympus E-P3optional n3.0 / 614 fixed Y 1/4000s 3.0 Y Y
14.
 
Olympus E-PL2optional n3.0 / 460 fixed n 1/4000s 3.0 Y Y
15.
 
Olympus E-PL3optional n3.0 / 460 tilting n 1/4000s 5.5 n Y
16.
 
Olympus E-P2optional n3.0 / 230 fixed n 1/4000s 3.0 n Y
17.
 
Panasonic GH11440 n3.0 / 460 swivel n 1/4000s 3.0 Y n

One difference between the cameras concerns the presence of an on-board flash. The T3i has one, while the E-P1 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-P1 does not have a selfie-screen.

The T3i writes its imaging data to SDXC cards, while the E-P1 uses SDHC cards.

Connectivity comparison

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-P1 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
    Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Canon T3iYmono / monoY-mini2.0---
2.
 
Olympus E-P1Ystereo / ---mini2.0---
3.
 
Canon SL2Ystereo / monoY-mini2.0YYY
4.
 
Canon T6sYstereo / monoY-mini2.0YY-
5.
 
Canon T5Ymono / mono--mini2.0---
6.
 
Canon SL1Ymono / monoY-mini2.0---
7.
 
Canon T5iYstereo / monoY-mini2.0---
8.
 
Canon MYstereo / monoY-mini2.0---
9.
 
Canon T4iYstereo / monoY-mini2.0---
10.
 
Canon T3Ystereo / mono--mini2.0---
11.
 
Canon T2iYstereo / -Y-mini2.0---
12.
 
Canon T1iYmono / mono--mini2.0---
13.
 
Olympus E-P3Ystereo / ---mini2.0---
14.
 
Olympus E-PL2Ystereo / ---mini2.0---
15.
 
Olympus E-PL3Ystereo / ---mini2.0---
16.
 
Olympus E-P2Ystereo / ---mini2.0---
17.
 
Panasonic GH1Ystereo / -Y-mini2.0---

It is notable that the T3i has a microphone port, which is missing on the E-P1. 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-P1 have been discontinued, but can regularly be found used on eBay. The E-P1 was replaced by the Olympus E-P2, while the T3i was followed by the Canon T4i. 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.

Review summary

So how do things add up? Which of the two cameras – the Canon T3i or the Olympus E-P1 – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.

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Advantages 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 markedly higher (10 points) in the DXO overall assessment.
  • More dynamic range: Captures a larger spectrum of light and dark details (1.1 EV of extra DR).
  • Better low-light sensitivity: Requires less light for good images (0.6 stops ISO advantage).
  • Better video: Provides higher definition movie capture (1080/30p vs 720/30p).
  • 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 230k 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.
  • Faster burst: Shoots at higher frequency (3.7 vs 3 flaps/sec) to capture the decisive moment.
  • Longer lasting: Can take more shots (440 versus 300) on a single battery charge.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • More affordable: Was introduced into a lower priced segment (25 percent cheaper at launch).
  • More modern: Is somewhat more recent (announced 1 year and 7 months after the E-P1).

ilogo

Arguments in favor of the Olympus PEN E-P1:

  • More compact: Is smaller (121x70mm vs 133x100mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 215g or 38 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 heavily discounted: Has been on the market for longer (launched in June 2009).

If the number of relative strengths (bullet points above) is taken as a guide, the T3i is the clear winner of the match-up (15 : 5 points). However, the pertinence of the various camera strengths will differ across photographers, so that you might want to weigh individual camera traits according to their importance for your own imaging needs before making a camera decision. 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.

T3i 15:05 E-P1

How about other alternatives? Do the specifications of the Canon T3i and the Olympus E-P1 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 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 T3i and the E-P1 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.

Expert reviews

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], 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.

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Expert Camera Reviews
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Canon T3i3/5o..77/1004.5/54.5/5 Feb 2011 599i
2.
 
Olympus E-P1..+..66/1004/54.5/5 Jun 2009 799i
3.
 
Canon SL24/5+ +4/578/1004.5/54.5/5 Jun 2017 549i
4.
 
Canon T6s5/5+..77/1004.5/54.5/5 Feb 2015 649i
5.
 
Canon T53/5+....4/54.5/5 Feb 2014 449i
6.
 
Canon SL14/5+..78/1004/54/5 Mar 2013 549i
7.
 
Canon T5i......76/1004.5/54.5/5 Mar 2013 649i
8.
 
Canon M3/5+....4/54/5 Jul 2012 599i
9.
 
Canon T4i4/5+ +..77/1004.5/54.5/5 Jun 2012 849i
10.
 
Canon T3..80/100..69/1004/54.5/5 Feb 2011 449i
11.
 
Canon T2i..+ +..77/1004/54.5/5 Feb 2010 699i
12.
 
Canon T1i..+ +..74/1004.5/54.5/5 Mar 2009 799i
13.
 
Olympus E-P3..83/100..74/1004.5/54.5/5 Jun 2011 799i
14.
 
Olympus E-PL23/583/100..71/1004.5/54.5/5 Jan 2011 599i
15.
 
Olympus E-PL33/5+ +..72/1004.5/54/5 Jun 2011 599i
16.
 
Olympus E-P23/5+..69/1004/54.5/5 Nov 2009 799i
17.
 
Panasonic GH1..+ +..72/1004.5/54.5/5 Mar 2009 899i
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

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 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.

Canon T3i:
Check Ebay offers
Olympus E-P1:
Check Ebay offers

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 a corresponding selection in the search boxes below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Canon T3i vs Olympus E-P1

    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 Specifications
    Camera Model Canon T3i Olympus E-P1
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Canon EF mount lenses Micro Four Thirds lenses
    Launch Date February 2011 June 2009
    Launch Price USD 599 USD 799
    Sensor Specs Canon T3i Olympus E-P1
    Sensor Technology CMOS CMOS
    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
    Crop Factor 1.6x 2.0x
    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 720/30p Video
    ISO Setting 100 - 6,400 ISO 100 - 6,400 ISO
    ISO Boost 100 - 12,800 ISO no Enhancement
    Image Processor DIGIC 4 TruePic V
    DXO Sensor Quality (score) 65 55
    DXO Color Depth (bits) 22.1 21.4
    DXO Dynamic Range (EV) 11.5 10.4
    DXO Low Light (ISO) 793 536
    Screen Specs Canon T3i Olympus E-P1
    Viewfinder Type Optical viewfinder no viewfinder
    Viewfinder Field of View 95%
    Viewfinder Magnification 0.53x
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 1040k dots 230k dots
    LCD Attachment Swivel screen Fixed screen
    Shooting Specs Canon T3i Olympus E-P1
    Focus System Phase-detect AF Contrast-detect AF
    Continuous Shooting 3.7 shutter flaps/s 3 shutter flaps/s
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Built-in Flash no On-Board Flash
    Storage Medium SDXC cards SDHC cards
    Second Storage Option Single card slot Single card slot
    UHS card support no no
    Connectivity Specs Canon T3i Olympus E-P1
    External Flash Hotshoe Hotshoe
    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-P1
    Battery Type LP-E8 BLS-1
    Battery Life (CIPA)440 shots per charge300 shots per charge
    Body Dimensions 133 x 100 x 80 mm
    (5.2 x 3.9 x 3.1 in)
    121 x 70 x 36 mm
    (4.8 x 2.8 x 1.4 in)
    Camera Weight 570 g (20.1 oz) 355 g (12.5 oz)

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