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Canon T3i vs Olympus E-420

The Canon EOS Rebel T3i (called Canon 600D in some regions) and the Olympus E-420 are two digital cameras that were announced, respectively, in February 2011 and March 2008. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (T3i) 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.

Headline Specifications
Canon T3i
versus
Olympus E-420
Canon T3i   Olympus E-420
Digital single lens reflex Digital single lens reflex
Canon EF mount lenses Four Thirds lenses
17.9 MP – APS-C sensor 10 MP – Four Thirds sensor
1080/30p Video no Video
ISO 100-6,400 (100 - 12,800) ISO 100-1,600
Optical viewfinder Optical viewfinder
3.0" LCD – 1040k dots 2.7" LCD – 215k dots
Swivel screen (not touch-sensitive) Fixed screen (not touch-sensitive)
3.7 shutter flaps per second 3.5 shutter flaps per second
440 shots per battery charge500 shots per battery charge
133 x 100 x 80 mm, 570 g 130 x 91 x 53 mm, 440 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS Rebel T3i 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.

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Body comparison

The side-by-side display below illustrates the physical size and weight of the Canon T3i and the Olympus E-420. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All width, height and depth measures are rounded to the nearest millimeter.

Size Canon T3i vs Olympus E-420
Compare T3i versus E-420 top
Comparison T3i or E-420 rear

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 (11 percent) than the Canon T3i. Moreover, the E-420 is markedly lighter (23 percent) than the T3i. In this context, it is worth noting that neither the T3i nor the E-420 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 Four Thirds Lens Catalog (E-420).

Concerning battery life, the T3i gets 440 shots out of its Canon LP-E8 battery, while the E-420 can take 500 images on a single charge of its Olympus BLS-1 power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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Body Specifications
  empty Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price
Street
Price
1.
 
Canon T3i 133 mm 100 mm 80 mm 570 g 440 n Feb 2011 US$ 599ebay.com
2.
 
Olympus E-420 130 mm 91 mm 53 mm 440 g 500 n Mar 2008 US$ 599ebay.com
3.
 
Canon M 109 mm 66 mm 32 mm 298 g 230 n Jul 2012 US$ 599ebay.com
4.
 
Canon SL1 117 mm 91 mm 69 mm 407 g 380 n Mar 2013 US$ 549ebay.com
5.
 
Canon T1i 129 mm 98 mm 62 mm 520 g 400 n Mar 2009 US$ 799ebay.com
6.
 
Canon T2i 129 mm 98 mm 62 mm 530 g 440 n Feb 2010 US$ 699ebay.com
7.
 
Canon T3 130 mm 100 mm 78 mm 495 g 700 n Feb 2011 US$ 449ebay.com
8.
 
Canon T4i 133 mm 100 mm 79 mm 575 g 440 n Jun 2012 US$ 849ebay.com
9.
 
Canon T5 130 mm 100 mm 78 mm 480 g 500 n Feb 2014 US$ 449ebay.com
10.
 
Canon T5i 133 mm 100 mm 79 mm 580 g 440 n Mar 2013 US$ 649ebay.com
11.
 
Canon T6 129 mm 101 mm 78 mm 485 g 500 n Mar 2016 US$ 449ebay.com
12.
 
Canon T6s 132 mm 101 mm 78 mm 565 g 440 n Feb 2015 US$ 649ebay.com
13.
 
Olympus E-400 130 mm 91 mm 53 mm 435 g 500 n Sep 2006 US$ 699ebay.com
14.
 
Olympus E-410 130 mm 91 mm 53 mm 435 g 500 n Mar 2007 US$ 699ebay.com
15.
 
Olympus E-450 130 mm 91 mm 53 mm 440 g 500 n Mar 2009 US$ 499ebay.com
16.
 
Olympus E-520 136 mm 92 mm 68 mm 535 g 750 n May 2008 US$ 699ebay.com
17.
 
Olympus E-620 130 mm 94 mm 60 mm 521 g 500 n Feb 2009 US$ 699ebay.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 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 two cameras under review were launched at the same price and fall into the same 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.

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. 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 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-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 T3i has a native 3:2 aspect ratio, while the one in the E-420 offers a 4:3 aspect.

Canon T3i and Olympus E-420 sensor measures

With 17.9MP, the T3i offers a higher resolution than the E-420 (10MP), but the T3i has smaller individual pixels (pixel pitch of 4.31μm versus 4.74μm for the E-420). However, the T3i is a much more recent model (by 2 years and 11 months) than the E-420, 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 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-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 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 E-420 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.

T3i versus E-420 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-420 (overall score 9 points higher), which gives it an advantage in terms of imaging quality. This advantage is based on 0.6 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
  empty 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-420 Four Thirds 10.0 3648 2736none21.510.452756
3.
 
Canon M APS-C 17.9 5184 34561080/30p22.111.282765
4.
 
Canon SL1 APS-C 17.9 5184 34561080/30p21.811.384363
5.
 
Canon T1i APS-C 15.1 4752 31681080/20p21.711.566363
6.
 
Canon T2i APS-C 17.9 5184 34561080/30p22.111.578466
7.
 
Canon T3 APS-C 12.2 4272 2848720/30p21.911.075562
8.
 
Canon T4i APS-C 17.9 5184 34561080/30p21.711.272262
9.
 
Canon T5 APS-C 17.9 5184 34561080/30p21.911.372463
10.
 
Canon T5i APS-C 17.9 5184 34561080/30p21.711.268161
11.
 
Canon T6 APS-C 17.9 5184 34561080/30p22.011.778166
12.
 
Canon T6s APS-C 24.0 6000 40001080/30p22.612.091570
13.
 
Olympus E-400 Four Thirds 10.0 3648 2736none21.010.612753
14.
 
Olympus E-410 Four Thirds 10.0 3648 2736none21.110.049451
15.
 
Olympus E-450 Four Thirds 10.0 3648 2736none21.510.551256
16.
 
Olympus E-520 Four Thirds 10.0 3648 2736none21.410.454855
17.
 
Olympus E-620 Four Thirds 12.2 4032 3024none21.310.353655
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 also of capturing video footage. The T3i indeed provides movie recording capabilities, while the E-420 does not. The highest resolution format that the T3i can use is 1080/30p.

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Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. The T3i 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 viewfinders of both cameras offer the same field of view (95%), but the viewfinder of the T3i has a higher magnification than the one of the E-420 (0.53x vs 0.46x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The following table reports on some other key feature differences and similarities of the Canon T3i, the Olympus E-420, and comparable cameras.

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Core Features
  empty Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Canon T3ioptical n3.0 / 1040 swivel n 1/4000s 3.7/s Y n
2.
 
Olympus E-420optical n2.7 / 215 fixed n 1/4000s 3.5/s Y n
3.
 
Canon Mnone n3.0 / 1040 fixed Y 1/4000s 4.3/s n n
4.
 
Canon SL1optical n3.0 / 1040 fixed Y 1/4000s 4.9/s Y n
5.
 
Canon T1ioptical n3.0 / 920 fixed n 1/4000s 3.4/s Y n
6.
 
Canon T2ioptical n3.0 / 1040 fixed n 1/4000s 3.7/s Y n
7.
 
Canon T3optical n2.7 / 230 fixed n 1/4000s 3.0/s Y n
8.
 
Canon T4ioptical n3.0 / 1040 swivel Y 1/4000s 5.0/s Y n
9.
 
Canon T5optical n3.0 / 460 fixed n 1/4000s 3.0/s Y n
10.
 
Canon T5ioptical n3.0 / 1040 swivel Y 1/4000s 5.0/s Y n
11.
 
Canon T6optical n3.0 / 920 fixed n 1/4000s 3.0/s Y n
12.
 
Canon T6soptical Y3.0 / 1040 swivel Y 1/4000s 5.0/s Y n
13.
 
Olympus E-400optical n2.5 / 215 fixed n 1/4000s 3.0/s Y n
14.
 
Olympus E-410optical n2.5 / 215 fixed n 1/4000s 3.0/s Y n
15.
 
Olympus E-450optical n2.7 / 215 fixed n 1/4000s 3.5/s Y n
16.
 
Olympus E-520optical n2.7 / 215 fixed n 1/4000s 3.5/s Y Y
17.
 
Olympus E-620optical n2.7 / 230 swivel n 1/4000s 4.0/s Y Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
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-420 does not have a selfie-screen.

The T3i writes its imaging data to SDXC 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 T3i only has one slot.

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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 E-420 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
  empty 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-420Y- / ----2.0---
3.
 
Canon MYstereo / monoY-mini2.0---
4.
 
Canon SL1Ymono / monoY-mini2.0---
5.
 
Canon T1iYmono / mono--mini2.0---
6.
 
Canon T2iYstereo / -Y-mini2.0---
7.
 
Canon T3Ystereo / mono--mini2.0---
8.
 
Canon T4iYstereo / monoY-mini2.0---
9.
 
Canon T5Ymono / mono--mini2.0---
10.
 
Canon T5iYstereo / monoY-mini2.0---
11.
 
Canon T6Ymono / mono--mini2.0YY-
12.
 
Canon T6sYstereo / monoY-mini2.0YY-
13.
 
Olympus E-400Y- / ----2.0---
14.
 
Olympus E-410Y- / ----2.0---
15.
 
Olympus E-450Y- / ----2.0---
16.
 
Olympus E-520Y- / ----2.0---
17.
 
Olympus E-620Y- / ----2.0---

Both the T3i and the E-420 have been discontinued, but can regularly be found used on ebay. The T3i was replaced by the Canon T4i, while the E-420 does not have a direct successor. Further information on the features and operation of the T3i and E-420 can be found, respectively, in the Canon T3i Manual (free pdf) or the online Olympus E-420 Manual.

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Review summary

So what is the bottom line? Is there a clear favorite between the Canon T3i and the Olympus E-420? Which camera is better? The listing below highlights the relative strengths of the two models.

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Arguments in favor of the Canon EOS Rebel T3i:

  • More detail: Offers more megapixels (17.9 vs 10MP) with a 37% higher linear resolution.
  • Better image quality: Scores markedly higher (9 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).
  • Broader imaging potential: Can record not only still images but also 1080/30p movies.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.53x vs 0.46x).
  • 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 (1040k vs 215k 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.
  • More modern: Reflects 2 years and 11 months of technical progress since the E-420 launch.

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Reasons to prefer the Olympus E-420:

  • More compact: Is smaller (130x91mm vs 133x100mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 130g or 23 percent) and is thus easier to take along.
  • Longer lasting: Gets more shots (500 versus 440) out of a single battery charge.
  • 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 March 2008).

If the count of relative strengths (bullet points above) is taken as a measure, the T3i is the clear winner of the match-up (11 : 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.

T3i 11:05 E-420

How about other alternatives? Do the specifications of the Canon T3i 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 comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the T3i or the E-420. 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.

Expert reviews

This is where reviews by experts come in. 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.

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Expert Camera Reviews
  empty  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price
Street
Price
1.
 
Canon T3i3/5o..77/1004.5/54.5/5 Feb 2011 US$ 599ebay.com
2.
 
Olympus E-420..85/100..+ +4/54.5/5 Mar 2008 US$ 599ebay.com
3.
 
Canon M3/5+....4/54/5 Jul 2012 US$ 599ebay.com
4.
 
Canon SL14/5+..78/1004/54/5 Mar 2013 US$ 549ebay.com
5.
 
Canon T1i..+ +..74/1004.5/54.5/5 Mar 2009 US$ 799ebay.com
6.
 
Canon T2i..+ +..77/1004/54.5/5 Feb 2010 US$ 699ebay.com
7.
 
Canon T3..80/100..69/1004/54.5/5 Feb 2011 US$ 449ebay.com
8.
 
Canon T4i4/5+ +..77/1004.5/54.5/5 Jun 2012 US$ 849ebay.com
9.
 
Canon T53/5+....4/54.5/5 Feb 2014 US$ 449ebay.com
10.
 
Canon T5i......76/1004.5/54.5/5 Mar 2013 US$ 649ebay.com
11.
 
Canon T64/5o4/573/1004/54/5 Mar 2016 US$ 449ebay.com
12.
 
Canon T6s5/5+..77/1004.5/54.5/5 Feb 2015 US$ 649ebay.com
13.
 
Olympus E-400..85/100....4/54/5 Sep 2006 US$ 699ebay.com
14.
 
Olympus E-410..86/100..+ +4/54.5/5 Mar 2007 US$ 699ebay.com
15.
 
Olympus E-450........4/54/5 Mar 2009 US$ 499ebay.com
16.
 
Olympus E-520..87/100..+ +4.5/54.5/5 May 2008 US$ 699ebay.com
17.
 
Olympus E-6203/588/100..72/1004.5/55/5 Feb 2009 US$ 699ebay.com
Note: (+ +) 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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

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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. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

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    Specifications: Canon T3i 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 Specifications
    Camera Model Canon T3i Olympus E-420
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Canon EF mount lenses Four Thirds lenses
    Launch Date February 2011 March 2008
    Launch Price USD 599 USD 599
    Sensor Specs Canon T3i Olympus E-420
    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 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 TruePic III
    DXO Sensor Quality (score) 65 56
    DXO Color Depth (bits) 22.1 21.5
    DXO Dynamic Range (EV) 11.5 10.4
    DXO Low Light (ISO) 793 527
    Screen Specs Canon T3i Olympus E-420
    Viewfinder Type Optical viewfinder Optical viewfinder
    Viewfinder Field of View 95% 95%
    Viewfinder Magnification 0.53x 0.46x
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 2.7inch
    LCD Resolution 1040k dots 215k dots
    LCD Attachment Swivel screen Fixed screen
    Shooting Specs Canon T3i Olympus E-420
    Focus System Phase-detect AF Phase-detect AF
    Continuous Shooting 3.7 shutter flaps/s 3.5 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 T3i Olympus E-420
    External Flash Hotshoe Hotshoe
    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 T3i Olympus E-420
    Battery Type Canon LP-E8 Olympus BLS-1
    Battery Life (CIPA)440 shots per charge500 shots per charge
    Body Dimensions 133 x 100 x 80 mm
    (5.2 x 3.9 x 3.1 in)
    130 x 91 x 53 mm
    (5.1 x 3.6 x 2.1 in)
    Camera Weight 570 g (20.1 oz) 440 g (15.5 oz)
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