OM System OM-3 vs Ricoh GR IIIx
The OM System OM-3 and the Ricoh GR IIIx are two digital cameras that were announced, respectively, in February 2025 and September 2021. The OM-3 is a mirrorless interchangeable lens camera, while the GR IIIx is a fixed lens compact. The cameras are based on a Four Thirds (OM-3) and an APS-C (GR IIIx) sensor. The OM System has a resolution of 20.2 megapixels, whereas the Ricoh provides 24 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Check OM-3 price at
amazon.com

Check GR IIIx price at
amazon.com
Going beyond this snapshot of core features and characteristics, what are the differences between the OM System OM-3 and the Ricoh GR IIIx? 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 OM System OM-3 and the Ricoh GR IIIx are illustrated 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 width, height and depth dimensions are rounded to the nearest millimeter.
The OM-3 can be obtained in two different colors (black, silver), while the GR IIIx 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 Ricoh GR IIIx is considerably smaller (45 percent) than the OM System OM-3. It is worth mentioning in this context that the OM-3 is splash and dust resistant, while the GR IIIx does not feature any corresponding weather-sealing.
The above size and weight comparisons are to some extent incomplete and possibly misleading, as the GR IIIx has a lens built in, whereas the OM-3 is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup. You can compare the optics available for the OM-3 and their specifications in the Micro Four Thirds Lens Catalog.
Concerning battery life, the OM-3 gets 590 shots out of its OM System BLX-1 battery, while the GR IIIx can take 200 images on a single charge of its Ricoh DB-110 power pack. The battery packs of both cameras can be charged via USB, 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. 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.

| Camera Model |
Camera Width |
Camera Height |
Camera Depth |
Camera Weight |
Battery Life |
Weather Sealing |
Camera Launch |
Launch Price |
Street Price |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | OM System OM-3 | 139 mm | 89 mm | 46 mm | 496 g | 590 | Y | Feb 2025 | US$ 1 999 | amazon.com | |
| 2. | Ricoh GR IIIx | 109 mm | 62 mm | 35 mm | 262 g | 200 | n | Sep 2021 | US$ 999 | amazon.com | |
| 3. | Fujifilm X-S10 | 126 mm | 85 mm | 65 mm | 465 g | 325 | n | Oct 2020 | US$ 999 | amazon.com | |
| 4. | Olympus E-M1 II | 134 mm | 91 mm | 67 mm | 574 g | 440 | Y | Sep 2016 | US$ 1 999 | ebay.com | |
| 5. | Olympus E-M1 III | 134 mm | 91 mm | 69 mm | 580 g | 420 | Y | Feb 2020 | US$ 1 799 | ebay.com | |
| 6. | Olympus E-M5 III | 125 mm | 85 mm | 50 mm | 414 g | 310 | Y | Oct 2019 | US$ 1 199 | ebay.com | |
| 7. | OM System OM-1 | 135 mm | 92 mm | 73 mm | 599 g | 520 | Y | Feb 2022 | US$ 2 199 | ebay.com | |
| 8. | OM System OM-1 II | 135 mm | 92 mm | 73 mm | 599 g | 500 | Y | Jan 2024 | US$ 2 399 | amazon.com | |
| 9. | OM System OM-5 | 125 mm | 85 mm | 50 mm | 414 g | 310 | Y | Oct 2022 | US$ 1 199 | amazon.com | |
| 10. | OM System OM-5 II | 125 mm | 85 mm | 50 mm | 414 g | 310 | Y | Jun 2025 | US$ 1 199 | amazon.com | |
| 11. | Panasonic G9 | 137 mm | 97 mm | 92 mm | 658 g | 400 | Y | Nov 2017 | US$ 1 699 | ebay.com | |
| 12. | Panasonic G95 | 130 mm | 94 mm | 77 mm | 536 g | 290 | Y | Apr 2019 | US$ 999 | ebay.com | |
| 13. | Panasonic GH5 | 139 mm | 98 mm | 87 mm | 725 g | 410 | Y | Jan 2017 | US$ 1 999 | ebay.com | |
| 14. | Ricoh GR II | 117 mm | 63 mm | 35 mm | 251 g | 320 | n | Jun 2015 | US$ 699 | ebay.com | |
| 15. | Ricoh GR III | 109 mm | 62 mm | 33 mm | 257 g | 200 | n | Feb 2019 | US$ 899 | amazon.com | |
| 16. | Sony RX100 V | 102 mm | 58 mm | 41 mm | 299 g | 220 | n | Oct 2016 | US$ 999 | ebay.com | |
| 17. | Sony RX100 VI | 102 mm | 58 mm | 43 mm | 301 g | 240 | n | Jun 2018 | US$ 1 199 | ebay.com | |
| Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders. | |||||||||||
The price is, of course, an important factor in any camera decision. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The GR IIIx was launched at a lower price than the OM-3, despite having a lens built in. 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 sensor inside a digital camera is one of the key determinants 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. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the OM System OM-3 features a Four Thirds sensor and the Ricoh GR IIIx an APS-C sensor. The sensor area in the GR IIIx is 63 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.0 and 1.5. The sensor in the OM-3 has a native 4:3 aspect ratio, while the one in the GR IIIx offers a 3:2 aspect.

With 24MP, the GR IIIx offers a higher resolution than the OM-3 (20.2MP), but the GR IIIx nevertheless has larger individual pixels (pixel pitch of 3.91μm versus 3.34μm for the OM-3) due to its larger sensor. However, the OM-3 is a much more recent model (by 3 years and 4 months) than the GR IIIx, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.
The resolution advantage of the Ricoh GR IIIx implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the GR IIIx 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 GR IIIx, 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 OM System OM-3 has a native sensitivity range from ISO 80 to ISO 25600, which can be extended to ISO 80-102400. The corresponding ISO settings for the Ricoh GR IIIx are ISO 100 to ISO 102400 (no boost).
In terms of underlying technology, the OM-3 is build around a Stacked BSI-CMOS sensor, while the GR IIIx uses a 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 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 table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

| Camera Model |
Sensor Class |
Resolution (MP) |
Horiz. Pixels |
Vert. Pixels |
Video Format |
DXO Portrait |
DXO Landscape |
DXO Sports |
DXO Overall |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | OM System OM-3 | Four Thirds | 20.2 | 5184 | 3888 | 4K/60p | 23.4 | 13.7 | 1852 | 78 | |
| 2. | Ricoh GR IIIx | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 24.2 | 13.8 | 2146 | 85 | |
| 3. | Fujifilm X-S10 | APS-C | 26.0 | 6240 | 4160 | 4K/30p | 24.2 | 13.7 | 2057 | 85 | |
| 4. | Olympus E-M1 II | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.7 | 12.8 | 1312 | 80 | |
| 5. | Olympus E-M1 III | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.3 | 13.1 | 1356 | 76 | |
| 6. | Olympus E-M5 III | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.3 | 13.1 | 1324 | 76 | |
| 7. | OM System OM-1 | Four Thirds | 20.2 | 5184 | 3888 | 4K/60p | 23.4 | 13.4 | 1553 | 77 | |
| 8. | OM System OM-1 II | Four Thirds | 20.2 | 5184 | 3888 | 4K/60p | 23.4 | 13.6 | 1749 | 78 | |
| 9. | OM System OM-5 | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.4 | 13.4 | 1622 | 78 | |
| 10. | OM System OM-5 II | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.4 | 13.7 | 1889 | 78 | |
| 11. | Panasonic G9 | Four Thirds | 20.2 | 5184 | 3888 | 4K/60p | 23.1 | 12.8 | 1138 | 74 | |
| 12. | Panasonic G95 | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.2 | 13.0 | 1273 | 75 | |
| 13. | Panasonic GH5 | Four Thirds | 20.2 | 5184 | 3888 | 4K/60p | 23.9 | 13.0 | 807 | 77 | |
| 14. | Ricoh GR II | APS-C | 16.1 | 4928 | 3264 | 1080/30p | 23.6 | 13.7 | 1078 | 80 | |
| 15. | Ricoh GR III | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 24.1 | 13.5 | 1897 | 83 | |
| 16. | Sony RX100 V | 1-inch | 20.0 | 5472 | 3648 | 4K/30p | 22.8 | 12.4 | 586 | 70 | |
| 17. | Sony RX100 VI | 1-inch | 20.0 | 5472 | 3648 | 4K/30p | 22.1 | 12.3 | 478 | 64 | |
| Note: DXO values in italics represent estimates based on sensor size and age. | |||||||||||
Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the OM-3 provides a higher video resolution than the GR IIIx. It can shoot video footage at 4K/60p, while the Ricoh 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), which can be very helpful when shooting in bright sunlight. In contrast, the GR IIIx relies on live view and the rear LCD for framing. That said, the GR IIIx can be equipped with an optional viewfinder – the GV-3. The adjacent table lists some of the other core features of the OM System OM-3 and Ricoh GR IIIx 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. | OM System OM-3 | 2360 | n | 3.0 / 1640 | swivel | Y | 1/8000s | 6.0/s | n | Y | |
| 2. | Ricoh GR IIIx | optional | n | 3.0 / 1037 | fixed | Y | 1/4000s | 4.0/s | n | Y | |
| 3. | Fujifilm X-S10 | 2360 | n | 3.0 / 1040 | swivel | Y | 1/4000s | 8.0/s | Y | Y | |
| 4. | Olympus E-M1 II | 2360 | n | 3.0 / 1037 | swivel | Y | 1/8000s | 18.0/s | n | Y | |
| 5. | Olympus E-M1 III | 2360 | n | 3.0 / 1037 | swivel | Y | 1/8000s | 18.0/s | n | Y | |
| 6. | Olympus E-M5 III | 2360 | n | 3.0 / 1040 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 7. | OM System OM-1 | 5760 | n | 3.0 / 1640 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 8. | OM System OM-1 II | 5760 | n | 3.0 / 1640 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 9. | OM System OM-5 | 2360 | n | 3.0 / 1040 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 10. | OM System OM-5 II | 2360 | n | 3.0 / 1040 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 11. | Panasonic G9 | 3680 | Y | 3.0 / 1040 | swivel | Y | 1/8000s | 20.0/s | n | Y | |
| 12. | Panasonic G95 | 2360 | n | 3.0 / 1240 | swivel | Y | 1/4000s | 9.0/s | Y | Y | |
| 13. | Panasonic GH5 | 3680 | n | 3.2 / 1620 | swivel | Y | 1/8000s | 12.0/s | n | Y | |
| 14. | Ricoh GR II | optional | n | 3.0 / 1230 | fixed | n | 1/4000s | 4.0/s | Y | n | |
| 15. | Ricoh GR III | optional | n | 3.0 / 1037 | fixed | Y | 1/4000s | 4.0/s | n | Y | |
| 16. | Sony RX100 V | 2359 | n | 3.0 / 1229 | tilting | n | 1/2000s | 24.0/s | Y | Y | |
| 17. | Sony RX100 VI | 2359 | n | 3.0 / 1229 | tilting | Y | 1/2000s | 24.0/s | Y | Y | |
| Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one. | |||||||||||
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 OM System OM-3 and the Ricoh GR IIIx 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 OM-3 and the GR IIIx 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 GR IIIx 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 OM System OM-3 and Ricoh GR IIIx 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. | OM System OM-3 | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | Y | |
| 2. | Ricoh GR IIIx | Y | stereo / mono | - | - | - | 3.0 | Y | - | Y | |
| 3. | Fujifilm X-S10 | Y | stereo / mono | Y | - | micro | 3.2 | Y | - | Y | |
| 4. | Olympus E-M1 II | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | - | |
| 5. | Olympus E-M1 III | Y | stereo / mono | Y | Y | micro | 3.1 | Y | - | Y | |
| 6. | Olympus E-M5 III | Y | stereo / mono | Y | - | micro | 2.0 | Y | - | Y | |
| 7. | OM System OM-1 | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | Y | |
| 8. | OM System OM-1 II | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | Y | |
| 9. | OM System OM-5 | Y | stereo / mono | Y | - | micro | 2.0 | Y | - | Y | |
| 10. | OM System OM-5 II | Y | stereo / mono | Y | - | micro | 2.0 | Y | - | Y | |
| 11. | Panasonic G9 | Y | stereo / mono | Y | Y | full | 3.0 | Y | - | Y | |
| 12. | Panasonic G95 | Y | stereo / mono | Y | Y | micro | 2.0 | Y | - | Y | |
| 13. | Panasonic GH5 | Y | stereo / mono | Y | Y | full | 3.1 | Y | - | Y | |
| 14. | Ricoh GR II | Y | stereo / mono | - | - | micro | 2.0 | Y | Y | - | |
| 15. | Ricoh GR III | Y | stereo / mono | - | - | - | 3.0 | Y | - | Y | |
| 16. | Sony RX100 V | - | stereo / mono | - | - | micro | 2.0 | Y | Y | - | |
| 17. | Sony RX100 VI | - | stereo / mono | - | - | micro | 2.0 | Y | Y | Y |
It is notable that the OM-3 has a microphone port, which is missing on the GR IIIx. Such an external microphone input can help to substantially improve the quality of audio recordings when a good external microphone is used.
Both the OM-3 and the GR IIIx are recent models that are part of the current product line-up. The GR IIIx replaced the earlier Ricoh GR II, while the OM-3 does not have a direct predecessor. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official OM System and Ricoh websites.
Review summary
So what is the bottom line? Is the OM System OM-3 better than the Ricoh GR IIIx or vice versa? Below is a summary of the relative strengths of each of the two contestants.

Advantages of the OM System OM-3:
- 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: Can connect to an external microphone for higher quality sound recording.
- Better sound control: Has a headphone port that enables audio monitoring while recording.
- Easier framing: Has an electronic viewfinder for image composition and settings control.
- More detailed LCD: Has a higher resolution rear screen (1640k vs 1037k 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.
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- Faster burst: Shoots at higher frequency (6 vs 4 flaps/sec) to capture the decisive moment.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- More flexible: Accepts interchangeable lenses, so that lens characteristics can be altered.
- Longer lasting: Can take more shots (590 versus 200) on a single battery charge.
- Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
- Faster buffer clearing: Supports a more advanced SD data transfer standard (UHS-II vs UHS-I).
- More modern: Reflects 3 years and 4 months of technical progress since the GR IIIx launch.

Arguments in favor of the Ricoh GR IIIx:
- More detail: Has more megapixels (24 vs 20.2MP), which boosts linear resolution by 11%.
- Better image quality: Features bigger pixels on a larger sensor for higher quality imaging.
- Richer colors: The pixel size advantage translates into images with better, more accurate colors.
- More dynamic range: Larger pixels capture a wider spectrum of light and dark details.
- Better low-light sensitivity: Larger pixels means good image quality even under poor lighting.
- Ready to shoot: Has an integrated lens, whereas the OM-3 necessitates an extra lens.
- More compact: Is smaller (109x62mm vs 139x89mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight even though it has a lens built in (unlike the OM-3).
- More affordable: Was introduced at a lower price, despite coming with a built-in lens.
- More heavily discounted: Has been around for much longer (launched in September 2021).
If the count of individual advantages (bullet points above) is taken as a guide, the OM-3 is the clear winner of the match-up (16 : 10 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 wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro 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 OM System OM-3 and the Ricoh GR IIIx place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best Prime Lens Compact Camera listings 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 says little about, for example, the shooting experience and imaging performance of the OM-3 and the GR IIIx in practical situations. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.
Expert reviews
This is why hands-on reviews by experts are important. 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. | OM System OM-3 | .. | .. | .. | 86/100 | .. | .. | Feb 2025 | US$ 1 999 | amazon.com | |
| 2. | Ricoh GR IIIx | .. | .. | 4.5/5 | .. | .. | .. | Sep 2021 | US$ 999 | amazon.com | |
| 3. | Fujifilm X-S10 | 5/5 | .. | 4.5/5 | 86/100 | 4.5/5 | 4.5/5 | Oct 2020 | US$ 999 | amazon.com | |
| 4. | Olympus E-M1 II | 5/5 | + + | 5/5 | 85/100 | 4.5/5 | 4.5/5 | Sep 2016 | US$ 1 999 | ebay.com | |
| 5. | Olympus E-M1 III | 5/5 | .. | 5/5 | 83/100 | 4.5/5 | 4/5 | Feb 2020 | US$ 1 799 | ebay.com | |
| 6. | Olympus E-M5 III | 5/5 | + | 5/5 | 82/100 | 4.5/5 | 4.5/5 | Oct 2019 | US$ 1 199 | ebay.com | |
| 7. | OM System OM-1 | 5/5 | .. | .. | 87/100 | 5/5 | 4.5/5 | Feb 2022 | US$ 2 199 | ebay.com | |
| 8. | OM System OM-1 II | .. | .. | .. | .. | .. | .. | Jan 2024 | US$ 2 399 | amazon.com | |
| 9. | OM System OM-5 | 5/5 | .. | 4.5/5 | 83/100 | 5/5 | 4.5/5 | Oct 2022 | US$ 1 199 | amazon.com | |
| 10. | OM System OM-5 II | .. | .. | .. | .. | .. | .. | Jun 2025 | US$ 1 199 | amazon.com | |
| 11. | Panasonic G9 | .. | + + | 5/5 | 85/100 | 5/5 | 5/5 | Nov 2017 | US$ 1 699 | ebay.com | |
| 12. | Panasonic G95 | 4.5/5 | + | 4.5/5 | 83/100 | 4.5/5 | 4.5/5 | Apr 2019 | US$ 999 | ebay.com | |
| 13. | Panasonic GH5 | 4.5/5 | + + | .. | 85/100 | 4.5/5 | 5/5 | Jan 2017 | US$ 1 999 | ebay.com | |
| 14. | Ricoh GR II | .. | .. | .. | .. | 4.5/5 | 4.5/5 | Jun 2015 | US$ 699 | ebay.com | |
| 15. | Ricoh GR III | 4/5 | .. | 3.5/5 | 81/100 | 4/5 | .. | Feb 2019 | US$ 899 | amazon.com | |
| 16. | Sony RX100 V | 4.5/5 | + + | .. | 83/100 | 4/5 | 4.5/5 | Oct 2016 | US$ 999 | ebay.com | |
| 17. | Sony RX100 VI | 4.5/5 | + + | .. | 83/100 | 4/5 | 4.5/5 | Jun 2018 | US$ 1 199 | ebay.com | |
| Note: (+ +) 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. 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. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Check OM-3 price at
amazon.com

Check GR IIIx price at
amazon.com
Other camera comparisons
Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just use the search menu below. 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 M6 Mark II vs Ricoh GR IIIx
- Canon R5 C vs Ricoh GR IIIx
- Canon R6 vs OM System OM-3
- Fujifilm X-M1 vs Ricoh GR IIIx
- OM System OM-3 vs Panasonic GH5
- OM System OM-3 vs Panasonic S1 II
- OM System OM-3 vs Pentax K-70
- OM System OM-3 vs Sony A6700
- Olympus E-M1 III vs Ricoh GR IIIx
- Olympus PEN-F vs Ricoh GR IIIx
- Ricoh GR IIIx vs Sony RX100 IV
Specifications: OM System OM-3 vs Ricoh GR IIIx
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 | OM System OM-3 | Ricoh GR IIIx |
|---|---|---|
| Camera Type | Mirrorless system camera | Fixed lens compact camera |
| Camera Lens | Micro Four Thirds lenses | 40mm f/2.8 |
| Launch Date | February 2025 | September 2021 |
| Launch Price | USD 1,999 | USD 999 |
| Sensor Specs | OM System OM-3 | Ricoh GR IIIx |
| Sensor Technology | Stacked BSI-CMOS | CMOS |
| Sensor Format | Four Thirds Sensor | APS-C Sensor |
| Sensor Size | 17.3 x 13.0 mm | 23.5 x 15.6 mm |
| Sensor Area | 224.9 mm2 | 366.6 mm2 |
| Sensor Diagonal | 21.6 mm | 28.2 mm |
| Crop Factor | 2.0x | 1.5x |
| Sensor Resolution | 20.2 Megapixels | 24 Megapixels |
| Image Resolution | 5184 x 3888 pixels | 6000 x 4000 pixels |
| Pixel Pitch | 3.34 μm | 3.91 μm |
| Pixel Density | 8.96 MP/cm2 | 6.55 MP/cm2 |
| Moiré control | no AA filter | no AA filter |
| Movie Capability | 4K/60p Video | 1080/60p Video |
| ISO Setting | 80 - 25,600 ISO | 100 - 102,400 ISO |
| ISO Boost | 80 - 102,400 ISO | no Enhancement |
| Image Processor | TruePic X | GR Engine VI |
| Screen Specs | OM System OM-3 | Ricoh GR IIIx |
| Viewfinder Type | Electronic viewfinder | Viewfinder optional |
| Viewfinder Field of View | 100% | |
| Viewfinder Magnification | 0.69x | |
| Viewfinder Resolution | 2360k dots | |
| LCD Framing | Live View | Live View |
| Rear LCD Size | 3.0inch | 3.0inch |
| LCD Resolution | 1640k dots | 1037k dots |
| LCD Attachment | Swivel screen | Fixed screen |
| Touch Input | Touchscreen | Touchscreen |
| Shooting Specs | OM System OM-3 | Ricoh GR IIIx |
| Focus System | On-Sensor Phase-detect | On-Sensor Phase-detect |
| Manual Focusing Aid | Focus Peaking | no Peaking Feature |
| Continuous Shooting | 6 shutter flaps/s | 4 shutter flaps/s |
| Electronic Shutter | up to 1/32000s | no E-Shutter |
| Time-Lapse Photography | Intervalometer built-in | Intervalometer built-in |
| Image Stabilization | In-body stabilization | In-body stabilization |
| Fill Flash | no On-Board 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-II | UHS-I |
| Connectivity Specs | OM System OM-3 | Ricoh GR IIIx |
| External Flash | Hotshoe | Hotshoe |
| USB Connector | USB 3.0 | USB 3.0 |
| HDMI Port | micro HDMI | no HDMI |
| Microphone Port | External MIC port | no MIC socket |
| Headphone Socket | Headphone port | no Headphone port |
| Wifi Support | Wifi built-in | Wifi built-in |
| Bluetooth Support | Bluetooth built-in | Bluetooth built-in |
| Body Specs | OM System OM-3 | Ricoh GR IIIx |
| Environmental Sealing | Weathersealed body | not weather sealed |
| Battery Type | OM System BLX-1 | Ricoh DB-110 |
| Battery Life (CIPA) | 590 shots per charge | 200 shots per charge |
| In-Camera Charging | USB charging | USB charging |
| Body Dimensions |
139 x 89 x 46 mm (5.5 x 3.5 x 1.8 in) |
109 x 62 x 35 mm (4.3 x 2.4 x 1.4 in) |
| Camera Weight | 496 g (17.5 oz) | 262 g (9.2 oz) |

Check OM-3 price at
amazon.com

Check GR IIIx price at
amazon.com
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