OM System OM-1 Vs Sony a7III

Mirrorless cameras with interchangeable lens systems are convenient, but different cameras offer different features and abilities. The OM System OM-1 Vs Sony a7III are some of the best cameras in the $2,000 price range with the same advanced features and are equally reliable. However, these cameras also have some notable differences that may affect your decision, so today, we will see what they can offer and which you will like better.

In this comparison, we will talk about the following:

  • What are the OM System OM-1 and Sony a7III?
  • How is the Design of OM System OM-1 and Sony a7III?
  • How is the Sensor in OM System OM-1 and Sony a7III?
  • How is the Autofocus in OM System OM-1 and Sony a7III?
  • How is the Video Recording in OM System OM-1 and Sony a7III?
  • OM System OM-1 Vs Sony a7III
  • Which Mirrorless Camera to Choose?
OM System OM-1Sony a7III
Product Dimensions 5.3 x 3.6 x 2.9 inches
5 x 3.88 x 3 inches
Shipping Weight 7.4 ounces
1.44 Pounds
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About the OM System OM-1 and Sony a7III

The sensor in a camera is crucial as it takes the light and translates it into the image you can see on the screen. The main difference between various cameras that can affect image quality is the sensor because of the size and resolution matter, depending on the application. The bigger the sensor, the bulkier the camera body and the better it is for low-light applications. However, many factors affect the price, so it doesn’t mean small sensors equal cheaper cameras. Read also: OM System OM-1 Vs Panasonic Lumix GH6.

If you have a budget of around $2,000 and need a new camera, the OM System OM-1 and Sony a7III are equally good options. These cameras are different based on the sensor and performance, but overall they are still reliable and great for hybrid users. The larger sensor in the a7III benefits those who will use the camera in low-light settings, as bigger sensors are always better at capturing more light and be more effective in producing clean images with fewer noises.

Which is the better camera, OM System OM-1 or Sony a7III? The answer depends on which you prefer better, a larger image sensor or overall higher performance, because the OM-1 is better on the performance side, including against the autofocus in Sony a7III. Sony is well-known for their autofocus system, but the a7III is more on the entry level. However, if you are on a budget and already have the lens, Sony a7III is still a solid choice for the price.

OM System OM-1 and Sony a7III Design

The OM System OM-1 and Sony a7III are similarly compact cameras, with OM-1 slightly wider. The control mechanism is familiar to the respective system, making the cameras easy to use, mainly if you have used the older variants. The rear panel rotates for OM-1, which tilts when you lift it. The Sony a7III only has a tilting mechanism, making it less versatile for hybrid users. These cameras have an EVF in the middle for ergonomics, but the EVF resolution is better on the OM-1.

OM System OM-1 and Sony a7III Sensor

Let’s see what the OM System OM-1 and Sony a7III can offer, starting from the sensor, which is also the main difference between these cameras. As mentioned above, the OM-1 is a micro-four-third camera, while the a7III is an APS-C model with a larger sensor. In addition, the a7III also has more pixels to work with. The difference in sensor size makes OM-1 faster, while the a7III is more reliable when working with less light. The image quality is equally good, but the s7III is more contrast.

Sony cameras usually have high contrast and deeper color than their competitors, affecting skin tone. The OM-1 delivers a more natural or neutral color for darker or yellowish skin, while white skin appears slightly warmer. Despite the sensor size and resolution difference, the details are similar when shooting at low ISO levels. The OM-1 may produce more noise when cranking the ISO higher, but it is normal for the sensor.

OM System OM-1 and Sony a7III Autofocus

Next is the autofocus, which is also crucial in cameras. Autofocus decides what to focus on the frame, and everyone wants a sharp shot every time they hit the shutter button. Unfortunately, getting a sharp shot from a moving subject requires more effort from the camera and photographer. The OM System OM-1 and Sony a7III come with contrast and phase detection, often known as hybrid autofocus, almost like the standard for modern cameras. The performance is also impressive, though they could be better in this category.

The OM-1 is a better camera when you get the compatible lens because this model can shoot up to 50fps using the selected lenses or 25fps for other lenses, thanks to the Quan Bayer image sensor. On the other hand, the a7III only shoots at 10fps, which is okay, but far from the OM-1. However, once the autofocus locks on its target, the a7III seems better at staying on the target, while the OM-1 often moves back and forth. Still, even the best autofocus will miss sometimes, and these two are still impressive for most users.

OM System OM-1 and Sony a7III Video Recording

The last part is video recording because many users buy these cameras to make videos. The main difference between OM System OM-1 and Sony a7III in this category is the recording mode which OM-1 is already capable of recording 10-bit videos while the a7III is still 8-bit. Some people may not necessarily need the 10-bit recording because it takes more space and processing power on the computer. But the quality can be worth it, especially for professionals or those who want to improve their video quality. Read also: OM System OM-1 Vs Panasonic G9.

As for the resolution, these cameras similarly record 4K, but the OM-1 can record up to 4K 60fps while the a7III is still 30fps. You can get higher frame rates when dropping the resolution. The OM-1 also has a microphone and headphones jack, while the a7III only has the microphone jack.

OM System OM-1 Vs Sony a7III

The OM System OM-1 and Sony a7III are good cameras for what they can offer, but they are also different. The a7III is an APS-C camera, bigger than OM-1’s micro-four-third sensor. The image color is different, with a7III being warmer and more contrast, but the details in low ISO are similar. The autofocus and performance are faster on OM-1, including the recording ability, because this camera can record at higher frame rates and 10-bit for more professional video quality.

- Native sensitivity range from ISO 200-102400, expandable down to ISO 80.
- Continuous shooting up to 10 fps with full-time AF/AE and a buffer of 169 raw frames when working with a mechanical shutter.
- Image Stabilization and Computational Photography 5-Axis Image Stabilization
- DCI/UHD 4K video recording is supported at up to 60p and 10-bit 4:2:0 sampling. Full HD recording is possible at high-speed rates up to 240 fps for slow-motion playback.
- Advanced 24.2MP BSI full frame Image Sensor w/ 1.8X readout speed
- 15 stop dynamic range, 14 bit uncompressed RAW, ISO 50 to 204,800. Compatible with Sony E mount lenses. Can be connected via Bluetooth with smartphones featuring (as of the date of release)- Android (Android 5.0 or later, Bluetooth 4.0 or later), iOS (Bluetooth 4.0 or later)
- Up to 10fps silent or mechanical shutter with AE/AF tracking. Battery life (Still Images): Approx. 610 shots (Viewfinder) / approx. 710 shots (LCD monitor), battery life (Movie, continuous recording): Approx. 200 min (Viewfinder) / Approx. 210 min (LCD monitor)
- 693 phase detection / 425 contrast AF points w/ 93 percent image coverage. Focus sensor: Exmor R CMOS sensor


There is no wrong choice between the OM System OM-1 and Sony a7III. We recommend these cameras for those who need a reliable device to capture still images or videos. But, the OM-1 is more capable in video and performance as the camera is also faster. However, if you already have the lenses, the a7IIi is still a solid choice at a lower price.

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