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Canon 20D vs Sony A900

The Canon EOS 20D and the Sony Alpha A900 are two digital cameras that were revealed to the public, respectively, in August 2004 and September 2008. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (20D) and a full frame (A900) sensor. The Canon has a resolution of 8.2 megapixels, whereas the Sony provides 24.4 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
Sony A900
Canon 20D   Sony A900
Digital single lens reflex Digital single lens reflex
Canon EF mount lenses Sony A mount lenses
8.2 MP – APS-C sensor 24.4 MP – Full Frame sensor
no Video no Video
ISO 100-1,600 (100 - 3,200) ISO 200-3,200 (100 - 6,400)
Optical viewfinder Optical viewfinder
1.8" LCD – 118k dots 1.8" LCD – 922k dots
Fixed screen (not touch-sensitive) Fixed screen (not touch-sensitive)
5 shutter flaps per second 5 shutter flaps per second
Lens stabilization onlyIn-body stabilization
not weather sealedWeathersealed body
700 shots per battery charge880 shots per battery charge
144 x 106 x 72 mm, 770 g 156 x 117 x 82 mm, 895 g
Canon 20D:
Check Ebay offers
Sony A900:
Check Ebay offers

Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 20D and the Sony Alpha A900? 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 Sony A900. 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 20D vs Sony A900
Compare 20D versus A900 top
Comparison 20D or A900 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A900 is notably larger (20 percent) than the Canon 20D. Moreover, the A900 is markedly heavier (16 percent) than the 20D. It is noteworthy in this context that the A900 is splash and dust-proof, while the 20D 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. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the 20D gets 700 shots out of its BP-511A battery, while the A900 can take 880 images on a single charge of its NP-FM500H power pack.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. 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.

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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.
 
Sony A900 156 mm 117 mm 82 mm 895 g 880 Y Sep 2008 2,999i
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.
 
Sony A9 127 mm 96 mm 63 mm 673 g 650 Y Apr 2017 4,499i
14.
 
Sony A99 II 143 mm 104 mm 76 mm 849 g 490 Y Sep 2016 3,199 i
15.
 
Sony A7S II 127 mm 96 mm 60 mm 627 g 370 Y Sep 2015 2,999i
16.
 
Sony A99 147 mm 111 mm 78 mm 812 g 500 Y Sep 2012 2,799i
17.
 
Sony A850 156 mm 117 mm 82 mm 895 g 880 Y Aug 2009 1,999i
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 20D was launched at a markedly lower price (by 50 percent) than the A900, 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.

Sensor comparison

The size of the sensor inside a digital camera is one of the key determinants of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units 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 tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Canon 20D features an APS-C sensor and the Sony A900 a full frame sensor. The sensor area in the A900 is 155 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.6 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

In terms of underlying technology, both cameras are build around CMOS sensors.

Canon 20D and Sony A900 sensor measures

With 24.4MP, the A900 offers a higher resolution than the 20D (8.2MP), but the A900 has smaller individual pixels (pixel pitch of 5.94μm versus 6.42μm for the 20D). Yet, the A900 is a much more recent model (by 4 years) than the 20D, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units.

The resolution advantage of the Sony A900 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A900 for good quality output (200 dots per inch) amounts to 30.2 x 20.2 inches or 76.8 x 51.2 cm, for very good quality (250 dpi) 24.2 x 16.1 inches or 61.4 x 41 cm, and for excellent quality (300 dpi) 20.2 x 13.4 inches or 51.2 x 34.1 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 Sony Alpha A900 are ISO 200 to ISO 3200, with the possibility to increase the ISO range to 100-6400.

20D versus A900 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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 consideration, the A900 offers substantially better image quality than the 20D (overall score 17 points higher). The advantage is based on 1.8 bits higher color depth, 1.3 EV in additional dynamic range, and 1 stops in additional low light sensitivity. The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

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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.
 
Sony A900 Full Frame 24.4 6048 4032none23.712.3143179
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.
 
Sony A9 Full Frame 24.0 6000 40004K/30p24.913.3351792
14.
 
Sony A99 II Full Frame 42.2 7952 53044K/30p25.413.4231792
15.
 
Sony A7S II Full Frame 12.0 4240 28324K/30p23.613.3299385
16.
 
Sony A99 Full Frame 24.0 6000 40001080/60p25.014.0155589
17.
 
Sony A850 Full Frame 24.4 6048 4032none23.812.2141579
Neither the 20D nor the A900 offer Live View, so that they cannot project the live image that the sensor receives onto the rear screen. Moreover, both cameras are still-image focused and cannot record videos.

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. The 20D and the A900 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 A900 offers a wider field of view (100%) than the one in the 20D (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the A900 has a higher magnification (0.74x vs 0.56x), 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 Sony A900, 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)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Canon 20Doptical Y1.8 / 118 fixed n 1/8000s 5.0/s Y n
2.
 
Sony A900optical Y3.0 / 922 fixed n 1/8000s 5.0/s n Y
3.
 
Canon 7D IIoptical Y3.0 / 1040 fixed n 1/8000s 10.0/s Y n
4.
 
Canon 60Doptical Y3.0 / 1040 swivel n 1/8000s 5.3/s Y n
5.
 
Canon 7Doptical Y3.0 / 920 fixed n 1/8000s 8.0/s Y n
6.
 
Canon 50Doptical Y3.0 / 920 fixed n 1/8000s 6.3/s Y n
7.
 
Canon 40Doptical Y3.0 / 230 fixed n 1/8000s 6.5/s Y n
8.
 
Canon 30Doptical Y2.5 / 230 fixed n 1/8000s 5.0/s Y n
9.
 
Canon XToptical n1.8 / 115 fixed n 1/4000s 3.0/s Y n
10.
 
Canon 10Doptical Y1.8 / 118 fixed n 1/4000s 3.0/s Y n
11.
 
Canon Rebeloptical n1.8 / 118 fixed n 1/4000s 2.5/s Y n
12.
 
Nikon D200optical Y2.5 / 230 fixed n 1/8000s 5.0/s Y n
13.
 
Sony A93686 n3.0 / 1440 tilting Y 1/8000s 20.0/s n Y
14.
 
Sony A99 II2400 Y3.0 / 1229 full-flex n 1/8000s 12.0/s n Y
15.
 
Sony A7S II2400 n3.0 / 1229 tilting n 1/8000s 5.0/s n Y
16.
 
Sony A992359 Y3.0 / 1229 full-flex n 1/8000s 6.0/s n Y
17.
 
Sony A850optical Y3.0 / 922 fixed n 1/8000s 3.0/s n Y
Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One difference between the cameras concerns the presence of an on-board flash. The 20D has one, while the A900 does not. While the built-in flash of the 20D is not very powerful, it can at times be useful as a fill-in light.

The 20D writes its imaging data to Compact Flash cards, while the A900 uses Compact Flash or Memory Stick PRO Duo cards. The A900 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 Sony Alpha A900 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.
 
Sony A900Y- / ---mini2.0---
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.
 
Sony A9Ystereo / monoYYmicro2.0YYY
14.
 
Sony A99 IIYstereo / monoYYmicro2.0YYY
15.
 
Sony A7S IIYstereo / monoYYmicro2.0YY-
16.
 
Sony A99Ystereo / monoYYmini2.0---
17.
 
Sony A850Y- / ---mini2.0---

Both cameras feature a PC Sync terminal to control professional strobe lights, which will be appreciated by studio photographers.

Both the 20D and the A900 have been discontinued, but can regularly be found used on eBay. The 20D was replaced by the Canon 30D, while the A900 was followed by the Sony A99. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon and Sony websites.

Review summary

So what conclusions can be drawn? Which of the two cameras – the Canon 20D or the Sony A900 – 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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Reasons to prefer the Canon EOS 20D:

  • More compact: Is smaller (144x106mm vs 156x117mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 125g or 14 percent) and hence easier to carry around.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • More affordable: Was introduced into a lower priced category (50 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in August 2004).

ilogo

Arguments in favor of the Sony Alpha A900:

  • More detail: Has more megapixels (24.4 vs 8.2MP), which boosts linear resolution by 73%.
  • Better image quality: Scores substantially higher (17 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (1.8 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (1.3 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (1 stops ISO advantage).
  • 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 (0.74x vs 0.56x).
  • Larger screen: Has a bigger rear LCD (3.0" vs 1.8") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (922k vs 118k dots).
  • Longer lasting: Gets more shots (880 versus 700) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • 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 modern: Reflects 4 years of technical progress since the 20D launch.

If the number of relative strengths (bullet points above) is taken as a guide, the A900 is the clear winner of the contest (15 : 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.

20D 05:15 A900

How about other alternatives? Do the specifications of the Canon 20D and the Sony A900 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 20D or the A900. 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 why expert reviews 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], 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.
 
Sony A900..+ +..+ +4.5/55/5 Sep 2008 2,999i
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.
 
Sony A95/5+ +4.8/589/1005/55/5 Apr 2017 4,499i
14.
 
Sony A99 II....4.5/585/1004.5/54.5/5 Sep 2016 3,199 i
15.
 
Sony A7S II5/5+....4.5/55/5 Sep 2015 2,999i
16.
 
Sony A995/5....84/1004.5/54.5/5 Sep 2012 2,799i
17.
 
Sony A8503/5....75/100..4.5/5 Aug 2009 1,999i
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The assessments were made in relation to similar cameras of the same technological generation. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparisons of ratings among very different cameras or across long time periods have little meaning. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Canon 20D:
Check Ebay offers
Sony A900:
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 20D vs Sony A900

    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 Sony A900
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Canon EF mount lenses Sony A mount lenses
    Launch Date August 2004 September 2008
    Launch Price USD 1,499 USD 2,999
    Sensor Specs Canon 20D Sony A900
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor Full Frame Sensor
    Sensor Size 22.5 x 15.0 mm 35.9 x 24.0 mm
    Sensor Area 337.5 mm2 861.6 mm2
    Sensor Diagonal 27 mm 43.2 mm
    Crop Factor 1.6x 1.0x
    Sensor Resolution 8.2 Megapixels 24.4 Megapixels
    Image Resolution 3504 x 2336 pixels 6048 x 4032 pixels
    Pixel Pitch 6.42 μm 5.94 μm
    Pixel Density 2.43 MP/cm2 2.83 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability no Video no Video
    ISO Setting 100 - 1,600 ISO 200 - 3,200 ISO
    ISO Boost 100 - 3,200 ISO 100 - 6,400 ISO
    Image Processor DIGIC 2 BIONZ
    DXO Sensor Quality (score) 62 79
    DXO Color Depth (bits) 21.9 23.7
    DXO Dynamic Range (EV) 11.0 12.3
    DXO Low Light (ISO) 721 1431
    Screen Specs Canon 20D Sony A900
    Viewfinder Type Optical viewfinder Optical viewfinder
    Viewfinder Field of View 95% 100%
    Viewfinder Magnification 0.56x 0.74x
    Top-Level Screen Control Panel Control Panel
    Rear LCD Size 1.8inch 3.0inch
    LCD Resolution 118k dots 922k dots
    LCD Attachment Fixed screen Fixed screen
    Shooting Specs Canon 20D Sony A900
    Focus System Phase-detect AF Phase-detect AF
    Continuous Shooting 5 shutter flaps/s 5 shutter flaps/s
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Built-in Flash no On-Board Flash
    Storage Medium CF cards CF or MS cards
    Second Storage Option Single card slot Dual card slots
    Connectivity Specs Canon 20D Sony A900
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket PC Sync socket
    USB Connector USB 1.1 USB 2.0
    HDMI Port no HDMI mini HDMI
    Wifi Support no Wifi no Wifi
    Body Specs Canon 20D Sony A900
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type BP-511A NP-FM500H
    Battery Life (CIPA)700 shots per charge880 shots per charge
    Body Dimensions 144 x 106 x 72 mm
    (5.7 x 4.2 x 2.8 in)
    156 x 117 x 82 mm
    (6.1 x 4.6 x 3.2 in)
    Camera Weight 770 g (27.2 oz) 895 g (31.6 oz)
    Canon 20D:
    Check Ebay offers
    Sony A900:
    Check Ebay offers

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