OM System OM-3 vs Sigma fp L
The OM System OM-3 and the Sigma fp L are two digital cameras that were announced, respectively, in February 2025 and March 2021. Both the OM-3 and the fp L are mirrorless interchangeable lens cameras that are based on a Four Thirds (OM-3) and a full frame (fp L) sensor. The OM System has a resolution of 20.2 megapixels, whereas the Sigma provides 60.2 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 fp L 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 Sigma fp L? 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 OM System OM-3 and the Sigma fp L is provided in the side-by-side display below. 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 dimensions are rounded to the nearest millimeter.
The OM-3 can be obtained in two different colors (black, silver), while the fp L 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 Sigma fp L is considerably smaller (36 percent) than the OM System OM-3. Moreover, the fp L is markedly lighter (14 percent) than the OM-3. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.
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 OM-3 gets 590 shots out of its OM System BLX-1 battery, while the fp L can take 240 images on a single charge of its Sigma BP-51 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. | Sigma fp L | 113 mm | 70 mm | 45 mm | 427 g | 240 | Y | Mar 2021 | US$ 2 499 | amazon.com | |
| 3. | Fujifilm X100V | 128 mm | 75 mm | 53 mm | 478 g | 420 | Y | Feb 2020 | US$ 1 399 | ebay.com | |
| 4. | Nikon D780 | 144 mm | 116 mm | 76 mm | 840 g | 2260 | Y | Jan 2020 | US$ 2 299 | amazon.com | |
| 5. | Olympus E-M1 II | 134 mm | 91 mm | 67 mm | 574 g | 440 | Y | Sep 2016 | US$ 1 999 | ebay.com | |
| 6. | Olympus E-M1 III | 134 mm | 91 mm | 69 mm | 580 g | 420 | Y | Feb 2020 | US$ 1 799 | ebay.com | |
| 7. | Olympus E-M5 III | 125 mm | 85 mm | 50 mm | 414 g | 310 | Y | Oct 2019 | US$ 1 199 | ebay.com | |
| 8. | OM System OM-1 | 135 mm | 92 mm | 73 mm | 599 g | 520 | Y | Feb 2022 | US$ 2 199 | ebay.com | |
| 9. | OM System OM-1 II | 135 mm | 92 mm | 73 mm | 599 g | 500 | Y | Jan 2024 | US$ 2 399 | amazon.com | |
| 10. | OM System OM-5 | 125 mm | 85 mm | 50 mm | 414 g | 310 | Y | Oct 2022 | US$ 1 199 | amazon.com | |
| 11. | OM System OM-5 II | 125 mm | 85 mm | 50 mm | 414 g | 310 | Y | Jun 2025 | US$ 1 199 | amazon.com | |
| 12. | Panasonic G9 | 137 mm | 97 mm | 92 mm | 658 g | 400 | Y | Nov 2017 | US$ 1 699 | ebay.com | |
| 13. | Panasonic G90 | 130 mm | 94 mm | 77 mm | 536 g | 290 | Y | Apr 2019 | US$ 999 | ebay.com | |
| 14. | Sigma fp | 113 mm | 70 mm | 45 mm | 422 g | 280 | Y | Jul 2019 | US$ 1 899 | amazon.com | |
| 15. | Sony A7C | 124 mm | 71 mm | 60 mm | 509 g | 740 | Y | Sep 2020 | US$ 1 799 | amazon.com | |
| 16. | Sony A7R | 127 mm | 94 mm | 48 mm | 465 g | 340 | Y | Oct 2013 | US$ 2 299 | ebay.com | |
| 17. | Sony A7S | 127 mm | 94 mm | 48 mm | 489 g | 380 | Y | Apr 2014 | US$ 2 499 | ebay.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 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 OM-3 was launched at a somewhat lower price (by 20 percent) than the fp L, which makes it more attractive for photographers on a tight budget. 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. 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 tend to be associated with larger, more expensive camera bodies and lenses.
Of the two cameras under consideration, the OM System OM-3 features a Four Thirds sensor and the Sigma fp L a full frame sensor. The sensor area in the fp L is 284 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.0 and 1.0. The sensor in the OM-3 has a native 4:3 aspect ratio, while the one in the fp L offers a 3:2 aspect.

With 60.2MP, the fp L offers a higher resolution than the OM-3 (20.2MP), but the fp L nevertheless has larger individual pixels (pixel pitch of 3.79μm 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 10 months) than the fp L, 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 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 Sigma fp L implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the fp L for good quality output (200 dots per inch) amounts to 47.6 x 31.6 inches or 120.9 x 80.4 cm, for very good quality (250 dpi) 38.1 x 25.3 inches or 96.7 x 64.3 cm, and for excellent quality (300 dpi) 31.7 x 21.1 inches or 80.6 x 53.6 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.
The OM-3 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
Unlike the fp L, 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 Sigma fp L are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 6-102400.
In terms of underlying technology, the OM-3 is build around a Stacked BSI-CMOS sensor, while the fp L uses a 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.

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.

| 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. | Sigma fp L | Full Frame | 60.2 | 9520 | 6328 | 4K/30p | 25.3 | 14.4 | 3001 | 96 | |
| 3. | Fujifilm X100V | APS-C | 26.0 | 6240 | 4160 | 4K/30p | 24.2 | 13.6 | 1996 | 84 | |
| 4. | Nikon D780 | Full Frame | 24.3 | 6048 | 4024 | 4K/30p | 25.3 | 14.3 | 2877 | 95 | |
| 5. | Olympus E-M1 II | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.7 | 12.8 | 1312 | 80 | |
| 6. | Olympus E-M1 III | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.3 | 13.1 | 1356 | 76 | |
| 7. | Olympus E-M5 III | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.3 | 13.1 | 1324 | 76 | |
| 8. | OM System OM-1 | Four Thirds | 20.2 | 5184 | 3888 | 4K/60p | 23.4 | 13.4 | 1553 | 77 | |
| 9. | OM System OM-1 II | Four Thirds | 20.2 | 5184 | 3888 | 4K/60p | 23.4 | 13.6 | 1749 | 78 | |
| 10. | OM System OM-5 | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.4 | 13.4 | 1622 | 78 | |
| 11. | OM System OM-5 II | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.4 | 13.7 | 1889 | 78 | |
| 12. | Panasonic G9 | Four Thirds | 20.2 | 5184 | 3888 | 4K/60p | 23.1 | 12.8 | 1138 | 74 | |
| 13. | Panasonic G90 | Four Thirds | 20.2 | 5184 | 3888 | 4K/30p | 23.2 | 13.0 | 1273 | 75 | |
| 14. | Sigma fp | Full Frame | 24.0 | 6000 | 4000 | 4K/30p | 25.2 | 14.2 | 2829 | 94 | |
| 15. | Sony A7C | Full Frame | 24.0 | 6000 | 4000 | 4K/30p | 25.0 | 14.7 | 3407 | 95 | |
| 16. | Sony A7R | Full Frame | 36.2 | 7360 | 4912 | 1080/60p | 25.6 | 14.1 | 2746 | 95 | |
| 17. | Sony A7S | Full Frame | 12.0 | 4240 | 2832 | 1080/60p | 23.9 | 13.2 | 3702 | 87 | |
| 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 frame rate than the fp L. It can shoot video footage at 4K/60p, while the Sigma is limited to 4K/30p.
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 fp L relies on live view and the rear LCD for framing. That said, the fp L can be equipped with an optional viewfinder – the EVF-11. The following table reports on some other key feature differences and similarities of the OM System OM-3, the Sigma fp L, and comparable cameras.

| 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. | Sigma fp L | optional | n | 3.2 / 2100 | fixed | Y | 1/8000s | 10.0/s | n | n | |
| 3. | Fujifilm X100V | 3690 | n | 3.0 / 1620 | tilting | Y | 1/4000s | 11.0/s | n | n | |
| 4. | Nikon D780 | optical | Y | 3.2 / 2359 | tilting | Y | 1/8000s | 12.0/s | n | n | |
| 5. | Olympus E-M1 II | 2360 | n | 3.0 / 1037 | swivel | Y | 1/8000s | 18.0/s | n | Y | |
| 6. | Olympus E-M1 III | 2360 | n | 3.0 / 1037 | swivel | Y | 1/8000s | 18.0/s | n | Y | |
| 7. | Olympus E-M5 III | 2360 | n | 3.0 / 1040 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 8. | OM System OM-1 | 5760 | n | 3.0 / 1640 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 9. | OM System OM-1 II | 5760 | n | 3.0 / 1640 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 10. | OM System OM-5 | 2360 | n | 3.0 / 1040 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 11. | OM System OM-5 II | 2360 | n | 3.0 / 1040 | swivel | Y | 1/8000s | 10.0/s | n | Y | |
| 12. | Panasonic G9 | 3680 | Y | 3.0 / 1040 | swivel | Y | 1/8000s | 20.0/s | n | Y | |
| 13. | Panasonic G90 | 2360 | n | 3.0 / 1240 | swivel | Y | 1/4000s | 9.0/s | Y | Y | |
| 14. | Sigma fp | optional | n | 3.2 / 2100 | fixed | Y | 1/8000s | 12.0/s | n | n | |
| 15. | Sony A7C | 2360 | n | 3.0 / 922 | swivel | Y | 1/4000s | 10.0/s | n | Y | |
| 16. | Sony A7R | 2400 | n | 3.0 / 1230 | tilting | n | 1/8000s | 4.0/s | n | n | |
| 17. | Sony A7S | 2400 | n | 3.0 / 921 | tilting | n | 1/8000s | 5.0/s | n | n | |
| Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one. | |||||||||||
One feature that differentiates the OM-3 and the fp L is in-body image stabilization (IBIS). The OM-3 reduces the risk of handshake-induced blur with all attached lenses, while the fp L offers no blur reduction with lenses that themselves do not provide optical image stabilization.
The OM-3 has an articulated LCD that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in snapping selfies. In contrast, the fp L 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, both cameras under consideration feature an 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 Sigma fp L 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 fp L write their files to SDXC cards. Both cameras support UHS-II cards, which provide for Ultra High Speed data transfer of up to 312 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 Sigma fp L 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. | Sigma fp L | Y | stereo / mono | Y | Y | micro | 3.2 | Y | - | - | |
| 3. | Fujifilm X100V | Y | stereo / mono | Y | - | micro | 3.1 | Y | - | Y | |
| 4. | Nikon D780 | Y | stereo / mono | Y | Y | mini | 3.1 | Y | - | Y | |
| 5. | Olympus E-M1 II | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | - | |
| 6. | Olympus E-M1 III | Y | stereo / mono | Y | Y | micro | 3.1 | Y | - | Y | |
| 7. | Olympus E-M5 III | Y | stereo / mono | Y | - | micro | 2.0 | Y | - | Y | |
| 8. | OM System OM-1 | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | Y | |
| 9. | OM System OM-1 II | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | Y | |
| 10. | OM System OM-5 | Y | stereo / mono | Y | - | micro | 2.0 | Y | - | Y | |
| 11. | OM System OM-5 II | Y | stereo / mono | Y | - | micro | 2.0 | Y | - | Y | |
| 12. | Panasonic G9 | Y | stereo / mono | Y | Y | full | 3.0 | Y | - | Y | |
| 13. | Panasonic G90 | Y | stereo / mono | Y | Y | micro | 2.0 | Y | - | Y | |
| 14. | Sigma fp | Y | stereo / mono | Y | - | micro | 3.1 | - | - | - | |
| 15. | Sony A7C | Y | stereo / mono | Y | Y | micro | 3.2 | Y | Y | Y | |
| 16. | Sony A7R | Y | stereo / mono | Y | Y | micro | 2.0 | Y | Y | - | |
| 17. | Sony A7S | Y | stereo / mono | Y | Y | micro | 2.0 | Y | Y | - |
Both the OM-3 and the fp L are recent models that are part of the current product line-up. Neither of the two has a direct predecessor, so perhaps they will constitute the origins of new camera lines for OM System and Sigma. 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 Sigma websites.
Review summary
So what conclusions can be drawn? Which of the two cameras – the OM System OM-3 or the Sigma fp L – has the upper hand? Is one clearly better than the other? A synthesis of the relative strong points of each of the models is listed below.

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 movie framerates (4K/60p versus 4K/30p).
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- Easier framing: Has an electronic viewfinder for image composition and settings control.
- 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.
- Longer lasting: Can take more shots (590 versus 240) on a single battery charge.
- Sharper images: Has hand-shake reducing image stabilization built-in.
- Easier wireless transfer: Supports Bluetooth for image sharing without cables.
- More affordable: Was introduced into a lower priced segment (20 percent cheaper at launch).
- More modern: Reflects 3 years and 10 months of technical progress since the fp L launch.

Reasons to prefer the Sigma fp L:
- More detail: Has more megapixels (60.2 vs 20.2MP), which boosts linear resolution by 76%.
- Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
- 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.
- Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
- More detailed LCD: Has a higher resolution rear screen (2100k vs 1640k dots).
- Faster burst: Shoots at higher frequency (10 vs 6 flaps/sec) to capture the decisive moment.
- More compact: Is smaller (113x70mm vs 139x89mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight (by 69g or 14 percent) and is thus easier to take along.
- More heavily discounted: Has been around for much longer (launched in March 2021).
If the number of relative strengths (bullet points above) is taken as a guide, the match-up finishes in a tie (12 points each). 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 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 Sigma fp L place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera listing 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 says little about, for example, the shooting experience and imaging performance of the OM-3 and the fp L in practical situations. 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 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.

| 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. | Sigma fp L | 4/5 | .. | 4/5 | .. | 4/5 | 4/5 | Mar 2021 | US$ 2 499 | amazon.com | |
| 3. | Fujifilm X100V | 5/5 | + + | 4.5/5 | 86/100 | 5/5 | 4.5/5 | Feb 2020 | US$ 1 399 | ebay.com | |
| 4. | Nikon D780 | 5/5 | .. | 5/5 | 87/100 | 4.5/5 | 4.5/5 | Jan 2020 | US$ 2 299 | amazon.com | |
| 5. | Olympus E-M1 II | 5/5 | + + | 5/5 | 85/100 | 4.5/5 | 4.5/5 | Sep 2016 | US$ 1 999 | ebay.com | |
| 6. | Olympus E-M1 III | 5/5 | .. | 5/5 | 83/100 | 4.5/5 | 4/5 | Feb 2020 | US$ 1 799 | ebay.com | |
| 7. | Olympus E-M5 III | 5/5 | + | 5/5 | 82/100 | 4.5/5 | 4.5/5 | Oct 2019 | US$ 1 199 | ebay.com | |
| 8. | OM System OM-1 | 5/5 | .. | .. | 87/100 | 5/5 | 4.5/5 | Feb 2022 | US$ 2 199 | ebay.com | |
| 9. | OM System OM-1 II | .. | .. | .. | .. | .. | .. | Jan 2024 | US$ 2 399 | amazon.com | |
| 10. | OM System OM-5 | 5/5 | .. | 4.5/5 | 83/100 | 5/5 | 4.5/5 | Oct 2022 | US$ 1 199 | amazon.com | |
| 11. | OM System OM-5 II | .. | .. | .. | .. | .. | .. | Jun 2025 | US$ 1 199 | amazon.com | |
| 12. | Panasonic G9 | .. | + + | 5/5 | 85/100 | 5/5 | 5/5 | Nov 2017 | US$ 1 699 | ebay.com | |
| 13. | Panasonic G90 | 4.5/5 | + | 4.5/5 | 83/100 | 4.5/5 | 4.5/5 | Apr 2019 | US$ 999 | ebay.com | |
| 14. | Sigma fp | 4/5 | .. | 4/5 | .. | 4/5 | 4.5/5 | Jul 2019 | US$ 1 899 | amazon.com | |
| 15. | Sony A7C | 3.5/5 | .. | 3.5/5 | 86/100 | 4/5 | 4/5 | Sep 2020 | US$ 1 799 | amazon.com | |
| 16. | Sony A7R | 5/5 | + + | .. | 82/100 | 4.5/5 | 5/5 | Oct 2013 | US$ 2 299 | ebay.com | |
| 17. | Sony A7S | 4/5 | .. | .. | 86/100 | 4.5/5 | 5/5 | Apr 2014 | US$ 2 499 | ebay.com | |
| Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available. | |||||||||||
The review scores listed above should be treated with care, though. The assessments were made in relation to similar cameras of the same technological generation. Thus, a score needs to be put into the context of the launch date and the launch price 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 OM-3 price at
amazon.com

Check fp L price at
amazon.com
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 use the search menu below. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.
- Canon 1D Mark IV vs Sigma fp L
- Canon 1D X Mark III vs OM System OM-3
- Canon R5 Mark II vs Sigma fp L
- Canon R7 vs OM System OM-3
- Leica SL2-S vs OM System OM-3
- OM System OM-3 vs Panasonic G80
- OM System OM-3 vs Sony ZV-1
- Olympus E-M5 III vs Sigma fp L
- Olympus E-PM1 vs OM System OM-3
- Panasonic S1H vs Sigma fp L
- Panasonic ZS80 vs Sigma fp L
- Pentax 645Z vs Sigma fp L
Specifications: OM System OM-3 vs Sigma fp L
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 | Sigma fp L |
|---|---|---|
| Camera Type | Mirrorless system camera | Mirrorless system camera |
| Camera Lens | Micro Four Thirds lenses | Leica L mount lenses |
| Launch Date | February 2025 | March 2021 |
| Launch Price | USD 1,999 | USD 2,499 |
| Sensor Specs | OM System OM-3 | Sigma fp L |
| Sensor Technology | Stacked BSI-CMOS | BSI-CMOS |
| Sensor Format | Four Thirds Sensor | Full Frame Sensor |
| Sensor Size | 17.3 x 13.0 mm | 36.0 x 24.0 mm |
| Sensor Area | 224.9 mm2 | 864 mm2 |
| Sensor Diagonal | 21.6 mm | 43.3 mm |
| Crop Factor | 2.0x | 1.0x |
| Sensor Resolution | 20.2 Megapixels | 60.2 Megapixels |
| Image Resolution | 5184 x 3888 pixels | 9520 x 6328 pixels |
| Pixel Pitch | 3.34 μm | 3.79 μm |
| Pixel Density | 8.96 MP/cm2 | 6.97 MP/cm2 |
| Moiré control | no AA filter | Anti-Alias filter |
| Movie Capability | 4K/60p Video | 4K/30p Video |
| ISO Setting | 80 - 25,600 ISO | 100 - 25,600 ISO |
| ISO Boost | 80 - 102,400 ISO | 6 - 102,400 ISO |
| Screen Specs | OM System OM-3 | Sigma fp L |
| 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 | 3.2inch |
| LCD Resolution | 1640k dots | 2100k dots |
| LCD Attachment | Swivel screen | Fixed screen |
| Touch Input | Touchscreen | Touchscreen |
| Shooting Specs | OM System OM-3 | Sigma fp L |
| Focus System | On-Sensor Phase-detect | Contrast-detect AF |
| Manual Focusing Aid | Focus Peaking | Focus Peaking |
| Max Shutter Speed (mechanical) | 1/8000s | 1/8000s |
| Continuous Shooting | 6 shutter flaps/s | 10 shutter flaps/s |
| Electronic Shutter | up to 1/32000s | up to 1/8000s |
| Time-Lapse Photography | Intervalometer built-in | Intervalometer built-in |
| Image Stabilization | In-body stabilization | Lens stabilization only |
| 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-II |
| Connectivity Specs | OM System OM-3 | Sigma fp L |
| External Flash | Hotshoe | Hotshoe |
| USB Connector | USB 3.0 | USB 3.2 |
| HDMI Port | micro HDMI | micro HDMI |
| Microphone Port | External MIC port | External MIC port |
| Headphone Socket | Headphone port | Headphone port |
| Wifi Support | Wifi built-in | Wifi built-in |
| Bluetooth Support | Bluetooth built-in | no Bluetooth |
| Body Specs | OM System OM-3 | Sigma fp L |
| Environmental Sealing | Weathersealed body | Weathersealed body |
| Battery Type | OM System BLX-1 | Sigma BP-51 |
| Battery Life (CIPA) | 590 shots per charge | 240 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) |
113 x 70 x 45 mm (4.4 x 2.8 x 1.8 in) |
| Camera Weight | 496 g (17.5 oz) | 427 g (15.1 oz) |

Check OM-3 price at
amazon.com

Check fp L price at
amazon.com
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