Canon 77D vs OM System OM-3
The Canon EOS 77D and the OM System OM-3 are two digital cameras that were officially introduced, respectively, in February 2017 and February 2025. The 77D is a DSLR, while the OM-3 is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (77D) and a Four Thirds (OM-3) sensor. The Canon has a resolution of 24 megapixels, whereas the OM System provides 20.2 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Check 77D offers at
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Check OM-3 price at
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Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 77D and the OM System OM-3? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.
Body comparison
An illustration of the physical size and weight of the Canon 77D and the OM System OM-3 is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All size dimensions are rounded to the nearest millimeter.
The OM-3 can be obtained in two different colors (black, silver), while the 77D is only available in black.



If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the OM System OM-3 is notably smaller (6 percent) than the Canon 77D. Moreover, the OM-3 is markedly lighter (8 percent) than the 77D. It is noteworthy in this context that the OM-3 is splash and dust-proof, while the 77D 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 (77D) and the Micro Four Thirds Lens Catalog (OM-3). Mirrorless cameras, such as the OM-3, 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 77D gets 600 shots out of its Canon LP-E17 battery, while the OM-3 can take 590 images on a single charge of its OM System BLX-1 power pack. The power pack in the OM-3 can be charged via the USB port, which can be very convenient when travelling.
The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. 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.

| Camera Model |
Camera Width |
Camera Height |
Camera Depth |
Camera Weight |
Battery Life |
Weather Sealing |
Camera Launch |
Launch Price |
Street Price |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Canon 77D | 131 mm | 100 mm | 76 mm | 540 g | 600 | n | Feb 2017 | US$ 899 | ebay.com | |
| 2. | OM System OM-3 | 139 mm | 89 mm | 46 mm | 496 g | 590 | Y | Feb 2025 | US$ 1 999 | amazon.com | |
| 3. | Canon M5 | 116 mm | 89 mm | 61 mm | 427 g | 295 | n | Sep 2016 | US$ 979 | ebay.com | |
| 4. | Canon M6 | 112 mm | 68 mm | 45 mm | 390 g | 295 | n | Feb 2017 | US$ 779 | ebay.com | |
| 5. | Canon SL2 | 122 mm | 93 mm | 70 mm | 453 g | 650 | n | Jun 2017 | US$ 549 | ebay.com | |
| 6. | Canon T4i | 133 mm | 100 mm | 79 mm | 575 g | 440 | n | Jun 2012 | US$ 849 | ebay.com | |
| 7. | Canon T6 | 129 mm | 101 mm | 78 mm | 485 g | 500 | n | Mar 2016 | US$ 449 | ebay.com | |
| 8. | Canon T6i | 132 mm | 101 mm | 78 mm | 555 g | 440 | n | Feb 2015 | US$ 749 | ebay.com | |
| 9. | Canon T6s | 132 mm | 101 mm | 78 mm | 565 g | 440 | n | Feb 2015 | US$ 649 | ebay.com | |
| 10. | Canon T7 | 129 mm | 101 mm | 78 mm | 475 g | 500 | n | Feb 2018 | US$ 449 | amazon.com | |
| 11. | Canon T7i | 131 mm | 100 mm | 76 mm | 532 g | 600 | n | Feb 2017 | US$ 749 | ebay.com | |
| 12. | Canon T8i | 131 mm | 103 mm | 76 mm | 515 g | 800 | n | Feb 2020 | US$ 749 | ebay.com | |
| 13. | Olympus E-M1 II | 134 mm | 91 mm | 67 mm | 574 g | 440 | Y | Sep 2016 | US$ 1 999 | ebay.com | |
| 14. | Olympus E-M1 III | 134 mm | 91 mm | 69 mm | 580 g | 420 | Y | Feb 2020 | US$ 1 799 | ebay.com | |
| 15. | OM System OM-1 | 135 mm | 92 mm | 73 mm | 599 g | 520 | Y | Feb 2022 | US$ 2 199 | ebay.com | |
| 16. | OM System OM-1 II | 135 mm | 92 mm | 73 mm | 599 g | 500 | Y | Jan 2024 | US$ 2 399 | amazon.com | |
| 17. | OM System OM-5 II | 125 mm | 85 mm | 50 mm | 414 g | 310 | Y | Jun 2025 | US$ 1 199 | 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 naturally be influenced heavily by the price. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The 77D was launched at a markedly lower price (by 55 percent) than the OM-3, which puts it into a different market segment. 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 imaging sensor is a crucial determinant of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Canon 77D features an APS-C sensor and the OM System OM-3 a Four Thirds sensor. The sensor area in the OM-3 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 77D has a native 3:2 aspect ratio, while the one in the OM-3 offers a 4:3 aspect.

With 24MP, the 77D offers a higher resolution than the OM-3 (20.2MP), but the 77D nevertheless has larger individual pixels (pixel pitch of 3.72μm versus 3.34μm for the OM-3) due to its larger sensor. However, the OM-3 is a much more recent model (by 7 years and 11 months) than the 77D, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that the OM-3 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.
The resolution advantage of the Canon 77D implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 77D for good quality output (200 dots per inch) amounts to 30 x 20 inches or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inches or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inches or 50.8 x 33.9 cm. The corresponding values for the OM System OM-3 are 25.9 x 19.4 inches or 65.8 x 49.4 cm for good quality, 20.7 x 15.6 inches or 52.7 x 39.5 cm for very good quality, and 17.3 x 13 inches or 43.9 x 32.9 cm for excellent quality prints.
Unlike the 77D, the OM-3 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 77D has a native sensitivity range from ISO 100 to ISO 25600, which can be extended to ISO 100-51200. The corresponding ISO settings for the OM System OM-3 are ISO 80 to ISO 25600, with the possibility to increase the ISO range to 80-102400.
In terms of underlying technology, the 77D is build around a CMOS sensor, while the OM-3 uses a Stacked BSI-CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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"). The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

| Camera Model |
Sensor Class |
Resolution (MP) |
Horiz. Pixels |
Vert. Pixels |
Video Format |
DXO Portrait |
DXO Landscape |
DXO Sports |
DXO Overall |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Canon 77D | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 23.6 | 13.3 | 971 | 78 | |
| 2. | OM System OM-3 | Four Thirds | 20.2 | 5184 | 3888 | 4K/60p | 23.4 | 13.7 | 1852 | 78 | |
| 3. | Canon M5 | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 23.4 | 12.4 | 1262 | 77 | |
| 4. | Canon M6 | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 23.4 | 12.6 | 1317 | 78 | |
| 5. | Canon SL2 | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 23.6 | 13.4 | 1041 | 79 | |
| 6. | Canon T4i | APS-C | 17.9 | 5184 | 3456 | 1080/30p | 21.7 | 11.2 | 722 | 62 | |
| 7. | Canon T6 | APS-C | 17.9 | 5184 | 3456 | 1080/30p | 22.0 | 11.7 | 781 | 66 | |
| 8. | Canon T6i | APS-C | 24.0 | 6000 | 4000 | 1080/30p | 22.7 | 12.0 | 919 | 71 | |
| 9. | Canon T6s | APS-C | 24.0 | 6000 | 4000 | 1080/30p | 22.6 | 12.0 | 915 | 70 | |
| 10. | Canon T7 | APS-C | 24.0 | 6000 | 4000 | 1080/30p | 23.8 | 13.3 | 1684 | 81 | |
| 11. | Canon T7i | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 23.7 | 13.1 | 1586 | 80 | |
| 12. | Canon T8i | APS-C | 24.0 | 6000 | 4000 | 4K/24p | 24.0 | 13.5 | 1873 | 83 | |
| 13. | Olympus E-M1 II | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.7 | 12.8 | 1312 | 80 | |
| 14. | Olympus E-M1 III | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.3 | 13.1 | 1356 | 76 | |
| 15. | OM System OM-1 | Four Thirds | 20.2 | 5184 | 3888 | 4K/60p | 23.4 | 13.4 | 1553 | 77 | |
| 16. | OM System OM-1 II | Four Thirds | 20.2 | 5184 | 3888 | 4K/60p | 23.4 | 13.6 | 1749 | 78 | |
| 17. | OM System OM-5 II | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.4 | 13.7 | 1889 | 78 | |
| 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. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the OM-3 provides a better video resolution than the 77D. It can shoot movie footage at 4K/60p, while the Canon is limited to 1080/60p.
Feature comparison
Beyond body and sensor, cameras can and do differ across a range of features. For example, the OM-3 has an electronic viewfinder (2360k dots), while the 77D 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 OM-3 offers a wider field of view (100%) than the one in the 77D (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the OM-3 has a higher magnification (0.69x vs 0.51x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The adjacent table lists some of the other core features of the Canon 77D and OM System OM-3 along with similar information for a selection of comparators.

| 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 77D | optical | Y | 3.0 / 1040 | swivel | Y | 1/4000s | 6.0/s | Y | n | |
| 2. | OM System OM-3 | 2360 | n | 3.0 / 1640 | swivel | Y | 1/8000s | 6.0/s | n | Y | |
| 3. | Canon M5 | 2360 | n | 3.2 / 1620 | tilting | Y | 1/4000s | 9.0/s | Y | n | |
| 4. | Canon M6 | optional | n | 3.0 / 1040 | tilting | Y | 1/4000s | 9.0/s | Y | n | |
| 5. | Canon SL2 | optical | n | 3.0 / 1040 | swivel | Y | 1/4000s | 5.0/s | Y | n | |
| 6. | Canon T4i | optical | n | 3.0 / 1040 | swivel | Y | 1/4000s | 5.0/s | Y | n | |
| 7. | Canon T6 | optical | n | 3.0 / 920 | fixed | n | 1/4000s | 3.0/s | Y | n | |
| 8. | Canon T6i | optical | n | 3.0 / 1040 | swivel | Y | 1/4000s | 5.0/s | Y | n | |
| 9. | Canon T6s | optical | Y | 3.0 / 1040 | swivel | Y | 1/4000s | 5.0/s | Y | n | |
| 10. | Canon T7 | optical | n | 3.0 / 920 | fixed | n | 1/4000s | 3.0/s | Y | n | |
| 11. | Canon T7i | optical | n | 3.0 / 1040 | swivel | Y | 1/4000s | 6.0/s | Y | n | |
| 12. | Canon T8i | optical | n | 3.0 / 1040 | swivel | Y | 1/4000s | 7.5/s | Y | n | |
| 13. | Olympus E-M1 II | 2360 | n | 3.0 / 1037 | swivel | Y | 1/8000s | 18.0/s | n | Y | |
| 14. | Olympus E-M1 III | 2360 | n | 3.0 / 1037 | swivel | Y | 1/8000s | 18.0/s | n | Y | |
| 15. | OM System OM-1 | 5760 | n | 3.0 / 1640 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 16. | OM System OM-1 II | 5760 | n | 3.0 / 1640 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 17. | OM System OM-5 II | 2360 | n | 3.0 / 1040 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| Note: *) 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 77D has one, while the OM-3 does not. While the built-in flash of the 77D is not very powerful, it can at times be useful as a fill-in light.
Both cameras have an articulated rear screen that can be turned to be front-facing. This feature will be particularly appreciated by vloggers and photographers who are interested in taking selfies.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 OM-3 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 Canon 77D and the OM System OM-3 both have 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.
Concerning the storage of imaging data, both the 77D and the OM-3 write their files to SDXC cards. The OM-3 supports UHS-II cards (Ultra High Speed data transfer of up to 312 MB/s), while the 77D can use UHS-I cards (up to 104 MB/s).
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 77D and OM System OM-3 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

| Camera Model |
Hotshoe Port |
Internal Mic / Speaker |
Microphone Port |
Headphone Port |
HDMI Port |
USB Port |
WiFi Support |
NFC Support |
Bluetooth Support |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Canon 77D | Y | stereo / mono | Y | - | mini | 2.0 | Y | Y | Y | |
| 2. | OM System OM-3 | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | Y | |
| 3. | Canon M5 | Y | stereo / mono | Y | - | mini | 2.0 | Y | Y | Y | |
| 4. | Canon M6 | Y | stereo / mono | Y | - | mini | 2.0 | Y | Y | Y | |
| 5. | Canon SL2 | Y | stereo / mono | Y | - | mini | 2.0 | Y | Y | Y | |
| 6. | Canon T4i | Y | stereo / mono | Y | - | mini | 2.0 | - | - | - | |
| 7. | Canon T6 | Y | mono / mono | - | - | mini | 2.0 | Y | Y | - | |
| 8. | Canon T6i | Y | stereo / mono | Y | - | mini | 2.0 | Y | Y | - | |
| 9. | Canon T6s | Y | stereo / mono | Y | - | mini | 2.0 | Y | Y | - | |
| 10. | Canon T7 | Y | mono / mono | - | - | mini | 2.0 | Y | Y | - | |
| 11. | Canon T7i | Y | stereo / mono | Y | - | mini | 2.0 | Y | Y | Y | |
| 12. | Canon T8i | Y | stereo / mono | Y | - | mini | 2.0 | Y | - | Y | |
| 13. | Olympus E-M1 II | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | - | |
| 14. | Olympus E-M1 III | Y | stereo / mono | Y | Y | micro | 3.1 | Y | - | Y | |
| 15. | OM System OM-1 | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | Y | |
| 16. | OM System OM-1 II | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | Y | |
| 17. | OM System OM-5 II | Y | stereo / mono | Y | - | micro | 2.0 | Y | - | Y |
It is notable that the OM-3 has a headphone jack, which makes it possible to attach external headphones and monitor the quality of sound during the recording process. The 77D lacks such a headphone port.
The OM-3 is a recent model that features in the current product line-up of OM System. In contrast, the 77D has been discontinued (but can be found pre-owned on ebay). There has not been a direct replacement model for the 77D from Canon. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon and OM System websites.
Review summary
So what conclusions can be drawn? Is there a clear favorite between the Canon 77D and the OM System OM-3? Which camera is better? Below is a summary of the relative strengths of each of the two contestants.

Advantages of the Canon EOS 77D:
- More detail: Offers more megapixels (24 vs 20.2MP) with a 11% higher linear resolution.
- 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.
- Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
- Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
- More affordable: Was introduced into a lower priced category (55 percent cheaper at launch).
- More heavily discounted: Has been available for much longer (launched in February 2017).

Arguments in favor of the OM System OM-3:
- 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.
- Better video: Provides higher definition movie capture (4K/60p vs 1080/60p).
- Better sound control: Has a headphone port that enables audio monitoring while recording.
- 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 (0.69x vs 0.51x).
- More detailed LCD: Has a higher resolution rear screen (1640k vs 1040k dots).
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- 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 (3.0 vs 2.0).
- Faster buffer clearing: Supports a more advanced SD data transfer standard (UHS-II vs UHS-I).
- More modern: Reflects 7 years and 11 months of technical progress since the 77D launch.
If the number of relative strengths (bullet points above) is taken as a guide, the OM-3 is the clear winner of the contest (17 : 8 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding 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.
How about other alternatives? Do the specifications of the Canon 77D and the OM System OM-3 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 technical specifications can provide a useful overview of the capabilities of different cameras, it remains incomplete and does no justice, for example, to the way the 77D or the OM-3 perform in practice. 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 adjacent summary-table relays the overall verdicts of several of the most popular 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.

| Camera Model |
AP score |
CL score |
DCW score |
DPR score |
EPZ score |
PB score |
Camera Launch |
Launch Price |
Street Price |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Canon 77D | 4.5/5 | .. | 4/5 | 82/100 | 4.5/5 | 4/5 | Feb 2017 | US$ 899 | ebay.com | |
| 2. | OM System OM-3 | .. | .. | .. | 86/100 | .. | .. | Feb 2025 | US$ 1 999 | amazon.com | |
| 3. | Canon M5 | 4/5 | + | 4/5 | 82/100 | 4/5 | 4/5 | Sep 2016 | US$ 979 | ebay.com | |
| 4. | Canon M6 | .. | .. | .. | 80/100 | 4/5 | 4/5 | Feb 2017 | US$ 779 | ebay.com | |
| 5. | Canon SL2 | 4/5 | + + | 4/5 | 78/100 | 4.5/5 | 4.5/5 | Jun 2017 | US$ 549 | ebay.com | |
| 6. | Canon T4i | 4/5 | + + | .. | 77/100 | 4.5/5 | 4.5/5 | Jun 2012 | US$ 849 | ebay.com | |
| 7. | Canon T6 | 4/5 | o | 4/5 | 73/100 | 4/5 | 4/5 | Mar 2016 | US$ 449 | ebay.com | |
| 8. | Canon T6i | 5/5 | .. | .. | 75/100 | 4.5/5 | 4.5/5 | Feb 2015 | US$ 749 | ebay.com | |
| 9. | Canon T6s | 5/5 | + | .. | 77/100 | 4.5/5 | 4.5/5 | Feb 2015 | US$ 649 | ebay.com | |
| 10. | Canon T7 | .. | o | 3.5/5 | .. | 3.5/5 | 3.5/5 | Feb 2018 | US$ 449 | amazon.com | |
| 11. | Canon T7i | 4.5/5 | .. | 3.5/5 | 80/100 | 4.5/5 | 4/5 | Feb 2017 | US$ 749 | ebay.com | |
| 12. | Canon T8i | 4.5/5 | + | 3/5 | 80/100 | 4/5 | 3.5/5 | Feb 2020 | US$ 749 | ebay.com | |
| 13. | Olympus E-M1 II | 5/5 | + + | 5/5 | 85/100 | 4.5/5 | 4.5/5 | Sep 2016 | US$ 1 999 | ebay.com | |
| 14. | Olympus E-M1 III | 5/5 | .. | 5/5 | 83/100 | 4.5/5 | 4/5 | Feb 2020 | US$ 1 799 | ebay.com | |
| 15. | OM System OM-1 | 5/5 | .. | .. | 87/100 | 5/5 | 4.5/5 | Feb 2022 | US$ 2 199 | ebay.com | |
| 16. | OM System OM-1 II | .. | .. | .. | .. | .. | .. | Jan 2024 | US$ 2 399 | amazon.com | |
| 17. | OM System OM-5 II | .. | .. | .. | .. | .. | .. | Jun 2025 | US$ 1 199 | amazon.com | |
| Note: (+ +) 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. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, please note that some of the review sites have changed their methodology and reporting over time.

Check 77D offers at
ebay.com

Check OM-3 price at
amazon.com
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 your choice using the following search menu. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.
- Canon 1100D vs OM System OM-3
- Canon 77D vs Canon R7
- Canon 77D vs Leica S Typ 007
- Canon 77D vs Nikon D100
- Canon 77D vs Nikon D7500
- Canon 77D vs Pentax K-3
- Canon 77D vs Sony NEX-F3
- Nikon Z50 II vs OM System OM-3
- OM System OM-1 vs OM System OM-3
- OM System OM-3 vs Panasonic G9
- OM System OM-3 vs Sony A6300
- OM System OM-3 vs Sony A7 IV
Specifications: Canon 77D vs OM System OM-3
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 Model | Canon 77D | OM System OM-3 |
|---|---|---|
| Camera Type | Digital single lens reflex | Mirrorless system camera |
| Camera Lens | Canon EF mount lenses | Micro Four Thirds lenses |
| Launch Date | February 2017 | February 2025 |
| Launch Price | USD 899 | USD 1,999 |
| Sensor Specs | Canon 77D | OM System OM-3 |
| Sensor Technology | CMOS | Stacked BSI-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 | 24 Megapixels | 20.2 Megapixels |
| Image Resolution | 6000 x 4000 pixels | 5184 x 3888 pixels |
| Pixel Pitch | 3.72 μm | 3.34 μm |
| Pixel Density | 7.22 MP/cm2 | 8.96 MP/cm2 |
| Moiré control | Anti-Alias filter | no AA filter |
| Movie Capability | 1080/60p Video | 4K/60p Video |
| ISO Setting | 100 - 25,600 ISO | 80 - 25,600 ISO |
| ISO Boost | 100 - 51,200 ISO | 80 - 102,400 ISO |
| Image Processor | DIGIC 7 | TruePic X |
| DXO Sensor Quality (score) | 78 | .. |
| DXO Color Depth (bits) | 23.6 | .. |
| DXO Dynamic Range (EV) | 13.3 | .. |
| DXO Low Light (ISO) | 971 | .. |
| Screen Specs | Canon 77D | OM System OM-3 |
| Viewfinder Type | Optical viewfinder | Electronic viewfinder |
| Viewfinder Field of View | 95% | 100% |
| Viewfinder Magnification | 0.51x | 0.69x |
| Viewfinder Resolution | 2360k dots | |
| Top-Level Screen | Control Panel | no Top Display |
| LCD Framing | Live View | Live View |
| Rear LCD Size | 3.0inch | 3.0inch |
| LCD Resolution | 1040k dots | 1640k dots |
| LCD Attachment | Swivel screen | Swivel screen |
| Touch Input | Touchscreen | Touchscreen |
| Shooting Specs | Canon 77D | OM System OM-3 |
| Focus System | Phase-detect AF | On-Sensor Phase-detect |
| Manual Focusing Aid | no Peaking Feature | Focus Peaking |
| Max Shutter Speed (mechanical) | 1/4000s | 1/8000s |
| Continuous Shooting | 6 shutter flaps/s | 6 shutter flaps/s |
| Electronic Shutter | no E-Shutter | up to 1/32000s |
| Time-Lapse Photography | Intervalometer built-in | Intervalometer built-in |
| Image Stabilization | Lens stabilization only | In-body stabilization |
| Fill Flash | Built-in Flash | no On-Board Flash |
| Storage Medium | SDXC cards | SDXC cards |
| Single or Dual Card Slots | Single card slot | Single card slot |
| UHS card support | UHS-I | UHS-II |
| Connectivity Specs | Canon 77D | OM System OM-3 |
| External Flash | Hotshoe | Hotshoe |
| USB Connector | USB 2.0 | USB 3.0 |
| HDMI Port | mini HDMI | micro HDMI |
| Microphone Port | External MIC port | External MIC port |
| Headphone Socket | no Headphone port | Headphone port |
| Wifi Support | Wifi built-in | Wifi built-in |
| Near-Field Communication | NFC built-in | no NFC |
| Bluetooth Support | Bluetooth built-in | Bluetooth built-in |
| Body Specs | Canon 77D | OM System OM-3 |
| Environmental Sealing | not weather sealed | Weathersealed body |
| Battery Type | Canon LP-E17 | OM System BLX-1 |
| Battery Life (CIPA) | 600 shots per charge | 590 shots per charge |
| In-Camera Charging | no USB charging | USB charging |
| Body Dimensions |
131 x 100 x 76 mm (5.2 x 3.9 x 3.0 in) |
139 x 89 x 46 mm (5.5 x 3.5 x 1.8 in) |
| Camera Weight | 540 g (19.0 oz) | 496 g (17.5 oz) |

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