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Canon 20D vs Olympus E-620

The Canon EOS 20D and the Olympus E-620 are two digital cameras that were revealed to the public, respectively, in August 2004 and February 2009. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (20D) and a Four Thirds (E-620) sensor. The Canon has a resolution of 8.2 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 20D
versus
Olympus E-620
Canon 20D   Olympus E-620
Digital single lens reflex Digital single lens reflex
Canon EF mount lenses Four Thirds lenses
8.2 MP, APS-C Sensor 12.2 MP, Four Thirds Sensor
no Video no Video
ISO 100-1,600 (100 - 3,200) ISO 100-3,200
Optical viewfinder Optical viewfinder
1.8 LCD, 118k dots 2.7 LCD, 230k dots
Fixed screen (not touch-sensitive) Swivel screen (not touch-sensitive)
5 shutter flaps per second 4 shutter flaps per second
Lens stabilization onlyIn-body stabilization
700 shots per battery charge500 shots per battery charge
144 x 106 x 72 mm, 770 g 130 x 94 x 60 mm, 521 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 20D and the Olympus E-620? 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

The side-by-side display below illustrates the physical size and weight of the Canon 20D and the Olympus E-620. 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 measures are rounded to the nearest millimeter.

Size Canon 20D vs Olympus E-620
Compare 20D versus E-620 top
Comparison 20D or E-620 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-620 is notably smaller (20 percent) than the Canon 20D. Moreover, the E-620 is markedly lighter (32 percent) than the 20D. In this context, it is worth noting that neither the 20D nor the E-620 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 (20D) and the Four Thirds Lens Catalog (E-620).

Concerning battery life, the 20D gets 700 shots out of its BP-511A battery, while the E-620 can take 500 images on a single charge of its BLS-1 power pack.

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.

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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 20D 144 mm 106 mm 72 mm 770 g 700 n Aug 2004 1,499i
2.
 
Olympus E-620 130 mm 94 mm 60 mm 521 g 500 n Feb 2009 699i
3.
 
Canon 7D II 149 mm 112 mm 78 mm 910 g 670 Y Sep 2014 1,799 i
4.
 
Canon 60D 145 mm 106 mm 79 mm 755 g 1100 Y Aug 2010 1,399i
5.
 
Canon 7D 148 mm 111 mm 74 mm 860 g 800 Y Sep 2009 1,699i
6.
 
Canon 50D 146 mm 108 mm 74 mm 822 g 800 Y Aug 2008 1,299i
7.
 
Canon 40D 146 mm 108 mm 74 mm 822 g 750 n Aug 2007 1,299i
8.
 
Canon 30D 144 mm 106 mm 74 mm 785 g 750 n Feb 2006 1,399i
9.
 
Canon XT 127 mm 94 mm 64 mm 540 g 400 n Feb 2005 899i
10.
 
Canon 10D 150 mm 107 mm 75 mm 850 g 500 n Feb 2003 1,999i
11.
 
Canon Rebel 142 mm 99 mm 72 mm 649 g 400 n Aug 2003 899i
12.
 
Nikon D200 147 mm 113 mm 74 mm 920 g 400 Y Nov 2005 1,699i
13.
 
Olympus E-600 130 mm 94 mm 60 mm 535 g 500 n Aug 2009 449i
14.
 
Olympus E-420 130 mm 91 mm 53 mm 440 g 500 n Mar 2008 599i
15.
 
Olympus E-520 136 mm 92 mm 68 mm 535 g 750 n May 2008 699i
16.
 
Olympus E-410 130 mm 91 mm 53 mm 435 g 500 n Mar 2007 699i
17.
 
Olympus E-510 136 mm 92 mm 68 mm 538 g 750 n Mar 2007 799i
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-620 was launched at a markedly lower price (by 53 percent) than the 20D, 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.

Sensor comparison

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. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its 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 20D features an APS-C sensor and the Olympus E-620 a Four Thirds sensor. The sensor area in the E-620 is 33 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 20D has a native 3:2 aspect ratio, while the one in the E-620 offers a 4:3 aspect.

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

Canon 20D and Olympus E-620 sensor measures

Despite having a smaller sensor, the E-620 offers a higher resolution of 12.2 megapixels, compared with 8.2 MP of the 20D. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 4.29μm versus 6.42μm for the 20D). However, it should be noted that the E-620 is much more recent (by 4 years and 6 months) than the 20D, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently.

The resolution advantage of the Olympus E-620 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the E-620 for good quality output (200 dots per inch) amounts to 20.2 x 15.1 inches or 51.2 x 38.4 cm, for very good quality (250 dpi) 16.1 x 12.1 inches or 41 x 30.7 cm, and for excellent quality (300 dpi) 13.4 x 10.1 inches or 34.1 x 25.6 cm. The corresponding values for the Canon 20D are 17.5 x 11.7 inches or 44.5 x 29.7 cm for good quality, 14 x 9.3 inches or 35.6 x 23.7 cm for very good quality, and 11.7 x 7.8 inches or 29.7 x 19.8 cm for excellent quality prints.

The Canon EOS 20D has a native sensitivity range from ISO 100 to ISO 1600, which can be extended to ISO 100-3200. The corresponding ISO settings for the Olympus E-620 are ISO 100 to ISO 3200 (no boost).

20D versus E-620 MP

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 20D has a notably higher overall DXO score than the E-620 (overall score 7 points higher), which gives it an advantage in terms of imaging quality. This advantage is based on 0.6 bits higher color depth, 0.7 EV in additional dynamic range, and 0.4 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.

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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 20D APS-C 8.2 3504 2336none21.911.072162
2.
 
Olympus E-620 Four Thirds 12.2 4032 3024none21.310.353655
3.
 
Canon 7D II APS-C 20.0 5472 36481080/60p22.411.8108270
4.
 
Canon 60D APS-C 17.9 5184 34561080/30p22.211.581366
5.
 
Canon 7D APS-C 17.9 5184 34561080/30p22.011.785466
6.
 
Canon 50D APS-C 15.1 4752 3168none21.811.469663
7.
 
Canon 40D APS-C 10.1 3888 2592none22.111.370364
8.
 
Canon 30D APS-C 8.2 3504 2336none21.510.873659
9.
 
Canon XT APS-C 8.0 3456 2304none21.810.863760
10.
 
Canon 10D APS-C 6.3 3072 2048none21.110.957157
11.
 
Canon Rebel APS-C 6.3 3072 2048none21.010.854455
12.
 
Nikon D200 APS-C 10.0 3872 2592none22.311.558364
13.
 
Olympus E-600 Four Thirds 12.2 4032 3024none21.510.354155
14.
 
Olympus E-420 Four Thirds 10.0 3648 2736none21.510.452756
15.
 
Olympus E-520 Four Thirds 10.0 3648 2736none21.410.454855
16.
 
Olympus E-410 Four Thirds 10.0 3648 2736none21.110.049451
17.
 
Olympus E-510 Four Thirds 10.0 3648 2736none21.210.044252
The E-620 offers Live View, so that it can project the live image that the sensor receives onto the rear screen for framing. The 20D lacks this capability. Both cameras are still-image focused and cannot record videos.

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. The 20D and the E-620 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 20D has a higher magnification than the one of the E-620 (0.56x vs 0.48x), 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 20D, the Olympus E-620, and comparable cameras.

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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 20Doptical Y1.8 / 118 fixed n 1/8000s 5.0 Y n
2.
 
Olympus E-620optical n2.7 / 230 swivel n 1/4000s 4.0 Y Y
3.
 
Canon 7D IIoptical Y3.0 / 1040 fixed n 1/8000s 10.0 Y n
4.
 
Canon 60Doptical Y3.0 / 1040 swivel n 1/8000s 5.3 Y n
5.
 
Canon 7Doptical Y3.0 / 920 fixed n 1/8000s 8.0 Y n
6.
 
Canon 50Doptical Y3.0 / 920 fixed n 1/8000s 6.3 Y n
7.
 
Canon 40Doptical Y3.0 / 230 fixed n 1/8000s 6.5 Y n
8.
 
Canon 30Doptical Y2.5 / 230 fixed n 1/8000s 5.0 Y n
9.
 
Canon XToptical n1.8 / 115 fixed n 1/4000s 3.0 Y n
10.
 
Canon 10Doptical Y1.8 / 118 fixed n 1/4000s 3.0 Y n
11.
 
Canon Rebeloptical n1.8 / 118 fixed n 1/4000s 2.5 Y n
12.
 
Nikon D200optical Y2.5 / 230 fixed n 1/8000s 5.0 Y n
13.
 
Olympus E-600optical n2.7 / 230 swivel n 1/4000s 4.0 Y Y
14.
 
Olympus E-420optical n2.7 / 215 fixed n 1/4000s 3.5 Y n
15.
 
Olympus E-520optical n2.7 / 215 fixed n 1/4000s 3.5 Y Y
16.
 
Olympus E-410optical n2.5 / 215 fixed n 1/4000s 3.0 Y n
17.
 
Olympus E-510optical n2.5 / 215 fixed n 1/4000s 3.0 Y Y

One feature that is present on the 20D, but is missing on the E-620 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 E-620 has an articulated screen that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in taking selfies. In contrast, the 20D does not have a selfie-screen.

The 20D writes its imaging data to Compact Flash cards, while the E-620 uses Compact Flash or xD Picture cards. The E-620 features dual card slots, which can be very useful in case a memory card fails. In contrast, the 20D only has one slot.

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 20D and Olympus E-620 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 20DY- / ----1.1---
2.
 
Olympus E-620Y- / ----2.0---
3.
 
Canon 7D IIYstereo / monoYYmini3.0---
4.
 
Canon 60DYmono / monoY-mini2.0---
5.
 
Canon 7DYmono / -Y-mini2.0---
6.
 
Canon 50DY- / ---mini2.0---
7.
 
Canon 40DY- / ----2.0---
8.
 
Canon 30DY- / ----2.0---
9.
 
Canon XTY- / ----2.0---
10.
 
Canon 10DY- / ----1.1---
11.
 
Canon RebelY- / ----1.1---
12.
 
Nikon D200Y- / ----2.0---
13.
 
Olympus E-600Y- / ----2.0---
14.
 
Olympus E-420Y- / ----2.0---
15.
 
Olympus E-520Y- / ----2.0---
16.
 
Olympus E-410Y- / ----2.0---
17.
 
Olympus E-510Y- / ----2.0---

Studio photographers will appreciate that the Canon 20D (unlike the E-620) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the 20D and the E-620 have been discontinued, but can regularly be found used on eBay. The 20D was replaced by the Canon 30D, while the E-620 was followed by the Olympus E-600. 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 what conclusions can be drawn? Is there a clear favorite between the Canon 20D and the Olympus E-620? Which camera is better? A synthesis of the relative strong points of each of the models is listed below.

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Arguments in favor of the Canon EOS 20D:

  • Better image quality: Scores markedly higher (7 points) in the DXO overall assessment.
  • More dynamic range: Captures a larger spectrum of light and dark details (0.7 EV of extra DR).
  • Better low-light sensitivity: Requires less light for good images (0.4 stops ISO advantage).
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.56x vs 0.48x).
  • Easier setting verification: Features an LCD display on top to control shooting parameters.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (5 vs 4 flaps/sec) to capture the decisive moment.
  • Longer lasting: Can take more shots (700 versus 500) on a single battery charge.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • More heavily discounted: Has been available for much longer (launched in August 2004).

ilogo

Reasons to prefer the Olympus E-620:

  • More detail: Has more megapixels (12.2 vs 8.2MP), which boosts linear resolution by 20%.
  • Larger screen: Has a bigger rear LCD (2.7" vs 1.8") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (230k vs 118k 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 compact: Is smaller (130x94mm vs 144x106mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 249g or 32 percent) and is thus easier to take along.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • Faster data transfer: Supports a more advanced USB protocol (2.0 vs 1.1).
  • 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 (53 percent cheaper at launch).
  • More modern: Reflects 4 years and 6 months of technical progress since the 20D launch.

If the number of relative strengths (bullet points above) is taken as a guide, the E-620 emerges as the winner of the match-up (12 : 10 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 sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

20D 10:12 E-620

How about other alternatives? Do the specifications of the Canon 20D and the Olympus E-620 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 the spec-sheets of cameras can offer a general idea of their imaging potential, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the 20D or the E-620. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is where reviews by experts come in. 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 20D......+ +.... Aug 2004 1,499i
2.
 
Olympus E-6203/588/100..72/1004.5/55/5 Feb 2009 699i
3.
 
Canon 7D II4.5/5+3.5/584/1004/54.5/5 Sep 2014 1,799 i
4.
 
Canon 60D5/5+..79/1004/54.5/5 Aug 2010 1,399i
5.
 
Canon 7D5/5+ +..84/1004.5/54.5/5 Sep 2009 1,699i
6.
 
Canon 50D..+ +..+ +4.5/54.5/5 Aug 2008 1,299i
7.
 
Canon 40D..+ +..+ +4.5/54.5/5 Aug 2007 1,299i
8.
 
Canon 30D..+ +..+ +o.. Feb 2006 1,399i
9.
 
Canon XT..80/100..+ +o.. Feb 2005 899i
10.
 
Canon 10D......+ +.... Feb 2003 1,999i
11.
 
Canon Rebel......+ +.... Aug 2003 899i
12.
 
Nikon D200..+ +..+ +o.. Nov 2005 1,699i
13.
 
Olympus E-600..........4.5/5 Aug 2009 449i
14.
 
Olympus E-420..85/100..+ +4/54.5/5 Mar 2008 599i
15.
 
Olympus E-520..87/100..+ +4.5/54.5/5 May 2008 699i
16.
 
Olympus E-410..86/100..+ +4/54.5/5 Mar 2007 699i
17.
 
Olympus E-510..89/100..+ +3.5/54.5/5 Mar 2007 799i
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. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

Canon 20D:
Check Ebay offers
Olympus E-620:
Check Ebay offers

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. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Canon 20D vs Olympus E-620

    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 20D Olympus E-620
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Canon EF mount lenses Four Thirds lenses
    Launch Date August 2004 February 2009
    Launch Price USD 1,499 USD 699
    Sensor Specs Canon 20D Olympus E-620
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor Four Thirds Sensor
    Sensor Size 22.5 x 15.0 mm 17.3 x 13.0 mm
    Sensor Area 337.5 mm2 224.9 mm2
    Sensor Diagonal 27 mm 21.6 mm
    Crop Factor 1.6x 2.0x
    Sensor Resolution 8.2 Megapixels 12.2 Megapixels
    Image Resolution 3504 x 2336 pixels 4032 x 3024 pixels
    Pixel Pitch 6.42 μm 4.29 μm
    Pixel Density 2.43 MP/cm2 5.42 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability no Video no Video
    ISO Setting 100 - 1,600 ISO 100 - 3,200 ISO
    ISO Boost 100 - 3,200 ISO no Enhancement
    Image Processor DIGIC 2 TruePic III+
    DXO Sensor Quality (score) 62 55
    DXO Color Depth (bits) 21.9 21.3
    DXO Dynamic Range (EV) 11.0 10.3
    DXO Low Light (ISO) 721 536
    Screen Specs Canon 20D Olympus E-620
    Viewfinder Type Optical viewfinder Optical viewfinder
    Viewfinder Field of View 95% 95%
    Viewfinder Magnification 0.56x 0.48x
    Top-Level Screen Control Panel no Top Display
    LCD Framing Live View
    Rear LCD Size 1.8inch 2.7inch
    LCD Resolution 118k dots 230k dots
    LCD Attachment Fixed screen Swivel screen
    Shooting Specs Canon 20D Olympus E-620
    Focus System Phase-detect AF Phase-detect AF
    Continuous Shooting 5 shutter flaps/s 4 shutter flaps/s
    Image StabilizationLens stabilization onlyIn-body stabilization
    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 20D Olympus E-620
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    USB Connector USB 1.1 USB 2.0
    HDMI Port no HDMI no HDMI
    Wifi Support no Wifi no Wifi
    Body Specs Canon 20D Olympus E-620
    Battery Type BP-511A BLS-1
    Battery Life (CIPA)700 shots per charge500 shots per charge
    Body Dimensions 144 x 106 x 72 mm
    (5.7 x 4.2 x 2.8 in)
    130 x 94 x 60 mm
    (5.1 x 3.7 x 2.4 in)
    Camera Weight 770 g (27.2 oz) 521 g (18.4 oz)

    Did you notice an error on this page? If so, please get in touch, so that we can correct the information.

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