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Canon 30D vs Olympus E-M1 III

The Canon EOS 30D and the Olympus OM-D E-M1 Mark III are two enthusiast cameras that were revealed to the public, respectively, in February 2006 and February 2020. The 30D is a DSLR, while the E-M1 III is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (30D) and a Four Thirds (E-M1 III) sensor. The Canon has a resolution of 8.2 megapixels, whereas the Olympus provides 20.2 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Canon 30D
versus
Olympus E-M1 III
Canon 30D   Olympus E-M1 III
Digital single lens reflex Mirrorless system camera
Canon EF mount lenses Micro Four Thirds lenses
8.2 MP – APS-C sensor 20.2 MP – Four Thirds sensor
no Video 4K/30p Video
ISO 100-1,600 (100 - 3,200) ISO 200-25,600
Optical viewfinder Electronic viewfinder (2360k dots)
2.5" LCD – 230k dots 3.0" LCD – 1037k dots
Fixed screen (not touch-sensitive) Swivel touchscreen
5 shutter flaps per second 18 shutter flaps per second
Lens stabilization onlyIn-body stabilization
not weather sealedWeathersealed body
750 shots per battery charge420 shots per battery charge
144 x 106 x 74 mm, 785 g 134 x 91 x 69 mm, 580 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 30D and the Olympus OM-D E-M1 Mark III? 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 physical size and weight of the Canon 30D and the Olympus E-M1 III are illustrated in the side-by-side display below. 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 30D vs Olympus E-M1 III
Compare 30D versus E-M1 III top
Comparison 30D or E-M1 III rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-M1 III is notably smaller (20 percent) than the Canon 30D. Moreover, the E-M1 III is markedly lighter (26 percent) than the 30D. It is noteworthy in this context that the E-M1 III is splash and dust-proof, while the 30D 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. 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 (30D) and the Micro Four Thirds Lens Catalog (E-M1 III). Mirrorless cameras, such as the E-M1 III, 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 30D gets 750 shots out of its BP-511A battery, while the E-M1 III can take 420 images on a single charge of its BLH-1 power pack. The power pack in the E-M1 III can be charged via the USB port, which can be very convenient when travelling.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. 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
    Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Canon 30D 144 mm 106 mm 74 mm 785 g 750 n Feb 2006 1,399ebay.com
2.
 
Olympus E-M1 III 134 mm 91 mm 69 mm 580 g 420 Y Feb 2020 1,799 amazon.com
3.
 
Canon 70D 139 mm 104 mm 79 mm 755 g 920 Y Jul 2013 1,199ebay.com
4.
 
Canon 60D 145 mm 106 mm 79 mm 755 g 1100 Y Aug 2010 1,399ebay.com
5.
 
Canon 7D 148 mm 111 mm 74 mm 860 g 800 Y Sep 2009 1,699ebay.com
6.
 
Canon 50D 146 mm 108 mm 74 mm 822 g 800 Y Aug 2008 1,299ebay.com
7.
 
Canon 40D 146 mm 108 mm 74 mm 822 g 750 n Aug 2007 1,299ebay.com
8.
 
Canon 400D 127 mm 84 mm 65 mm 556 g 370 n Aug 2006 799ebay.com
9.
 
Canon 350D 127 mm 94 mm 64 mm 540 g 400 n Feb 2005 899ebay.com
10.
 
Canon 20D 144 mm 106 mm 72 mm 770 g 700 n Aug 2004 1,499ebay.com
11.
 
Nikon D80 132 mm 103 mm 77 mm 668 g 600 n Aug 2006 999ebay.com
12.
 
Nikon D200 147 mm 113 mm 74 mm 920 g 400 Y Nov 2005 1,699ebay.com
13.
 
Olympus E-M1X 144 mm 147 mm 75 mm 997 g 870 Y Jan 2019 2,999 amazon.com
14.
 
Olympus E-M1 II 134 mm 91 mm 67 mm 574 g 440 Y Sep 2016 1,999ebay.com
15.
 
OM System OM-1 135 mm 92 mm 73 mm 599 g 520 Y Feb 2022 2,199 amazon.com
16.
 
Panasonic G90 130 mm 94 mm 77 mm 536 g 290 Y Apr 2019 999 amazon.com
17.
 
Panasonic G9 137 mm 97 mm 92 mm 658 g 400 Y Nov 2017 1,699 amazon.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 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 30D was launched at a somewhat lower price (by 22 percent) than the E-M1 III, 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 size of the sensor inside a digital camera is one of the key determinants 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. 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 30D features an APS-C sensor and the Olympus E-M1 III a Four Thirds sensor. The sensor area in the E-M1 III 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 30D has a native 3:2 aspect ratio, while the one in the E-M1 III offers a 4:3 aspect.

Canon 30D and Olympus E-M1 III sensor measures

Despite having a smaller sensor, the E-M1 III offers a higher resolution of 20.2 megapixels, compared with 8.2 MP of the 30D. 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 3.34μm versus 6.42μm for the 30D). However, it should be noted that the E-M1 III is much more recent (by 13 years and 11 months) than the 30D, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently. Coming back to sensor resolution, it should be mentioned that the E-M1 III has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Olympus E-M1 III implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the E-M1 III for good quality output (200 dots per inch) amounts to 25.9 x 19.4 inches or 65.8 x 49.4 cm, for very good quality (250 dpi) 20.7 x 15.6 inches or 52.7 x 39.5 cm, and for excellent quality (300 dpi) 17.3 x 13 inches or 43.9 x 32.9 cm. The corresponding values for the Canon 30D 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 E-M1 III has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

Unlike the 30D, the E-M1 III has the capacity to capture high quality composite images (80MP) by combining multiple shots after shifting its sensor by miniscule distances. This multi-shot, pixel-shift mode is most suitable for photography of stationary objects (landscapes, studio scenes).

The Canon EOS 30D 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 OM-D E-M1 Mark III are ISO 200 to ISO 25600, with the possibility to increase the ISO range to 64-25600.

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.

30D versus E-M1 III 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. 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 30D APS-C 8.2 3504 2336none21.510.873659
2.
 
Olympus E-M1 III Four Thirds 20.2 5184 38884K/30p23.313.1135676
3.
 
Canon 70D APS-C 20.0 5472 36481080/30p22.511.692668
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 400D APS-C 10.1 3888 2592none22.111.066462
9.
 
Canon 350D APS-C 8.0 3456 2304none21.810.863760
10.
 
Canon 20D APS-C 8.2 3504 2336none21.911.072162
11.
 
Nikon D80 APS-C 10.0 3872 2592none22.111.252461
12.
 
Nikon D200 APS-C 10.0 3872 2592none22.311.558364
13.
 
Olympus E-M1X Four Thirds 20.2 5184 38884K/30p23.213.0125475
14.
 
Olympus E-M1 II Four Thirds 20.2 5184 38884K/30p23.712.8131280
15.
 
OM System OM-1 Four Thirds 20.2 5184 38884K/60p23.413.4155377
16.
 
Panasonic G90 Four Thirds 20.2 5184 38884K/30p23.213.0127375
17.
 
Panasonic G9 Four Thirds 20.2 5184 38884K/60p23.112.8113874
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 can also record movies. The E-M1 III indeed provides for movie recording, while the 30D does not. The highest resolution format that the E-M1 III can use is 4K/30p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the E-M1 III has an electronic viewfinder (2360k dots), while the 30D has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The viewfinder in the E-M1 III offers a wider field of view (100%) than the one in the 30D (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the E-M1 III 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 30D, the Olympus E-M1 III, 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 30Doptical Y2.5 / 230 fixed n 1/8000s 5.0/s Y n
2.
 
Olympus E-M1 III2360 n3.0 / 1037 swivel Y 1/8000s 18.0/s n Y
3.
 
Canon 70Doptical Y3.0 / 1040 swivel Y 1/8000s 7.0/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 400Doptical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
9.
 
Canon 350Doptical n1.8 / 115 fixed n 1/4000s 3.0/s Y n
10.
 
Canon 20Doptical Y1.8 / 118 fixed n 1/8000s 5.0/s Y n
11.
 
Nikon D80optical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
12.
 
Nikon D200optical Y2.5 / 230 fixed n 1/8000s 5.0/s Y n
13.
 
Olympus E-M1X2360 n3.0 / 1037 swivel Y 1/8000s 18.0/s n Y
14.
 
Olympus E-M1 II2360 n3.0 / 1037 swivel Y 1/8000s 18.0/s n Y
15.
 
OM System OM-15760 n3.0 / 1640 swivel Y 1/8000s 10.0/s n Y
16.
 
Panasonic G902360 n3.0 / 1240 swivel Y 1/4000s 9.0/s Y Y
17.
 
Panasonic G93680 Y3.0 / 1040 swivel Y 1/8000s 20.0/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 30D has one, while the E-M1 III does not. While the built-in flash of the 30D is not very powerful, it can at times be useful as a fill-in light.

The E-M1 III 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 30D does not have a selfie-screen.

The reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the E-M1 III is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).

The Olympus E-M1 III has an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

The 30D writes its imaging data to Compact Flash cards, while the E-M1 III uses SDXC cards. The E-M1 III features dual card slots, which can be very useful in case a memory card fails. In contrast, the 30D 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 30D and Olympus OM-D E-M1 Mark III 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 30DY- / ----2.0---
2.
 
Olympus E-M1 IIIYstereo / monoYYmicro3.1Y-Y
3.
 
Canon 70DYstereo / monoY-mini2.0Y--
4.
 
Canon 60DYmono / monoY-mini2.0---
5.
 
Canon 7DYmono / -Y-mini2.0---
6.
 
Canon 50DY- / ---mini2.0---
7.
 
Canon 40DY- / ----2.0---
8.
 
Canon 400DY- / ----2.0---
9.
 
Canon 350DY- / ----2.0---
10.
 
Canon 20DY- / ----1.1---
11.
 
Nikon D80Y- / ----2.0---
12.
 
Nikon D200Y- / ----2.0---
13.
 
Olympus E-M1XYstereo / monoYYmicro3.0Y-Y
14.
 
Olympus E-M1 IIYstereo / monoYYmicro3.0Y--
15.
 
OM System OM-1Ystereo / monoYYmicro3.0Y-Y
16.
 
Panasonic G90Ystereo / monoYYmicro2.0Y-Y
17.
 
Panasonic G9Ystereo / monoYYfull3.0Y-Y

It is notable that the E-M1 III offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the 30D does not provide wifi capability.

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

The E-M1 III is a recent model that features in the current product line-up of Olympus. In contrast, the 30D has been discontinued (but can be found pre-owned on ebay). As a replacement in the same line of cameras, the 30D was succeeded by the Canon 40D. Further information on the features and operation of the 30D and E-M1 III can be found, respectively, in the Canon 30D Manual (free pdf) or the online Olympus E-M1 III Manual.

Review summary

So what conclusions can be drawn? Is there a clear favorite between the Canon 30D and the Olympus E-M1 III? Which camera is better? Below is a summary of the relative strengths of each of the two contestants.

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Arguments in favor of the Canon EOS 30D:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Easier setting verification: Features an LCD display on top to control shooting parameters.
  • Longer lasting: Can take more shots (750 versus 420) 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 (22 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in February 2006).

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Reasons to prefer the Olympus OM-D E-M1 Mark III:

  • More detail: Has more megapixels (20.2 vs 8.2MP), which boosts linear resolution by 54%.
  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Broader imaging potential: Can capture not only stills but also 4K/30p video.
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • 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 2.5") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (1037k vs 230k dots).
  • More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster burst: Shoots at higher frequency (18 vs 5 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • More compact: Is smaller (134x91mm vs 144x106mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 205g or 26 percent) and is thus easier to take along.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • 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.
  • More legacy lens friendly: Can use many non-native lenses via adapters.
  • Faster data transfer: Supports a more advanced USB protocol (3.1 vs 2.0).
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier wireless transfer: Supports Bluetooth for image sharing without cables.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More modern: Reflects 13 years and 11 months of technical progress since the 30D launch.

If the number of relative strengths (bullet points above) is taken as a guide, the E-M1 III is the clear winner of the contest (27 : 7 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.

30D 07:27 E-M1 III

How about other alternatives? Do the specifications of the Canon 30D and the Olympus E-M1 III place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the 30D or the E-M1 III. 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 30D..+ +..+ +o.. Feb 2006 1,399ebay.com
2.
 
Olympus E-M1 III5/5..5/583/1004.5/54/5 Feb 2020 1,799 amazon.com
3.
 
Canon 70D5/5+ +..83/1004.5/55/5 Jul 2013 1,199ebay.com
4.
 
Canon 60D5/5+..79/1004/54.5/5 Aug 2010 1,399ebay.com
5.
 
Canon 7D5/5+ +..84/1004.5/54.5/5 Sep 2009 1,699ebay.com
6.
 
Canon 50D..+ +..+ +4.5/54.5/5 Aug 2008 1,299ebay.com
7.
 
Canon 40D..+ +..+ +4.5/54.5/5 Aug 2007 1,299ebay.com
8.
 
Canon 400D..+ +..+ +o4/5 Aug 2006 799ebay.com
9.
 
Canon 350D..80/100..+ +o.. Feb 2005 899ebay.com
10.
 
Canon 20D......+ +.... Aug 2004 1,499ebay.com
11.
 
Nikon D80..+..+ +o4.5/5 Aug 2006 999ebay.com
12.
 
Nikon D200..+ +..+ +o.. Nov 2005 1,699ebay.com
13.
 
Olympus E-M1X4.5/5o5/585/1004.5/5.. Jan 2019 2,999 amazon.com
14.
 
Olympus E-M1 II5/5+ +5/585/1004.5/54.5/5 Sep 2016 1,999ebay.com
15.
 
OM System OM-15/5....87/1005/54.5/5 Feb 2022 2,199 amazon.com
16.
 
Panasonic G904.5/5+4.5/583/1004.5/54.5/5 Apr 2019 999 amazon.com
17.
 
Panasonic G9..+ +5/585/1005/55/5 Nov 2017 1,699 amazon.com
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, 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.

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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 30D vs Olympus E-M1 III

    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 30D Olympus E-M1 III
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Canon EF mount lenses Micro Four Thirds lenses
    Launch Date February 2006 February 2020
    Launch Price USD 1,399 USD 1,799
    Sensor Specs Canon 30D Olympus E-M1 III
    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 20.2 Megapixels
    Image Resolution 3504 x 2336 pixels 5184 x 3888 pixels
    Pixel Pitch 6.42 μm 3.34 μm
    Pixel Density 2.43 MP/cm2 8.96 MP/cm2
    Moiré control Anti-Alias filter no AA filter
    Movie Capability no Video 4K/30p Video
    ISO Setting 100 - 1,600 ISO 200 - 25,600 ISO
    ISO Boost 100 - 3,200 ISO 64 - 25,600 ISO
    Image Processor DIGIC 2 TruePic IX
    DXO Sensor Quality (score) 59 ..
    DXO Color Depth (bits) 21.5 ..
    DXO Dynamic Range (EV) 10.8 ..
    DXO Low Light (ISO) 736 ..
    Screen Specs Canon 30D Olympus E-M1 III
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 95% 100%
    Viewfinder Magnification 0.56x 0.74x
    Viewfinder Resolution 2360k dots
    Top-Level Screen Control Panel no Top Display
    LCD Framing Live View
    Rear LCD Size 2.5inch 3.0inch
    LCD Resolution 230k dots 1037k dots
    LCD Attachment Fixed screen Swivel screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Canon 30D Olympus E-M1 III
    Focus System Phase-detect AF On-Sensor Phase-detect
    Manual Focusing Aidno Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/8000s 1/8000s
    Continuous Shooting 5 shutter flaps/s 18 shutter flaps/s
    Shutter Life Expectancy100 000 actuations400 000 actuations
    Electronic Shutterno E-Shutterup to 1/32000s
    Time-Lapse Photographyno IntervalometerIntervalometer built-in
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Built-in Flash no On-Board Flash
    Storage Medium CF cards SDXC cards
    Single or Dual Card Slots Single card slot Dual card slots
    Connectivity Specs Canon 30D Olympus E-M1 III
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket PC Sync socket
    USB Connector USB 2.0 USB 3.1
    HDMI Port no HDMI micro HDMI
    Microphone Port no MIC socket External MIC port
    Headphone Socket no Headphone port Headphone port
    Wifi Support no Wifi Wifi built-in
    Bluetooth Support no Bluetooth Bluetooth built-in
    Body Specs Canon 30D Olympus E-M1 III
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type BP-511A BLH-1
    Battery Life (CIPA)750 shots per charge420 shots per charge
    In-Camera Charging no USB charging USB charging
    Body Dimensions 144 x 106 x 74 mm
    (5.7 x 4.2 x 2.9 in)
    134 x 91 x 69 mm
    (5.3 x 3.6 x 2.7 in)
    Camera Weight 785 g (27.7 oz) 580 g (20.5 oz)
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