OM SYSTEM Olympus OM-3 Silver Micro Four Thirds vs Sony Alpha 7 III Full Frame Mirrorless Camera Kit with 28-
Updated August 2026 — OM SYSTEM Olympus OM-3 Silver Micro Four Thirds wins on build quality, Sony Alpha 7 III Full Frame Mirrorless Camera Kit with 28- wins on autofocus and battery life.
The Sony Alpha 7 III offers superior image quality and advanced features, making it the better choice for serious photographers and videographers.
Why OM SYSTEM Olympus OM-3 Silver Micro Four Thirds is better
Price
The Olympus OM-3 is about 10% cheaper than the Sony.
Weather Sealing
The Olympus has an IP53 rating for dust and water resistance.
Design
The Olympus features a vintage-styled, premium metal body.
Why Sony Alpha 7 III Full Frame Mirrorless Camera Kit with 28- is better
Image Quality
The Sony has a 24.2 MP full-frame sensor for better detail.
Autofocus
The Sony features advanced autofocus with 693 points.
Video Capabilities
The Sony excels in 4K video recording and color grading options.
Overall score
Specifications
| Spec | OM SYSTEM Olympus OM-3 Silver Micro Four Thirds | Sony Alpha 7 III Full Frame Mirrorless Camera Kit with 28- |
|---|---|---|
| Sensor Type | Micro Four Thirds | Full Frame |
| Megapixels | 20 MP | 24.2 MP |
| Image Stabilization | 5-axis | 5-axis |
| Autofocus Points | N/A | 693 |
| Video Resolution | N/A | 4K |
| Weather Sealing | IP53 | N/A |
Dimension comparison
Overview
The OM SYSTEM Olympus OM-3 Silver Micro Four Thirds System Camera and the Sony Alpha 7 III Full Frame Mirrorless Camera are two excellent options for photographers and videographers alike. Priced at $1,699.99 and $1,898.00 respectively, the Olympus camera is about 10% cheaper than the Sony. Both cameras come with impressive features tailored for different types of photography, making them appealing choices for various users.
Design and Build Quality
The OM SYSTEM Olympus OM-3 features a vintage-styled, premium metal body, enhancing its aesthetic appeal while ensuring durability. With an IP53 rating, it is dustproof, splashproof, and freezeproof, making it an excellent choice for outdoor photographers. In contrast, the Sony Alpha 7 III is designed for versatility and reliability, with a sleek, modern design that is equally robust. While both cameras are well-built, the Olympus offers added weather sealing, which could be crucial for adventurous photographers.
Sensor and Image Quality
The OM SYSTEM Olympus OM-3 is equipped with a 20 MP Stacked BSI Live MOS sensor, which provides excellent image quality for various shooting conditions. On the other hand, the Sony Alpha 7 III features a more powerful 24.2 MP full-frame Exmor R CMOS sensor, renowned for its remarkable clarity and dynamic range. The difference in megapixels and sensor technology makes the Sony a better option for those seeking the highest level of detail and performance in their images.
Autofocus System
For fast and accurate focusing, the Sony Alpha 7 III stands out with its advanced autofocus system, featuring 693 phase-detection and 425 contrast-detection points. This system excels in capturing sharp images, especially in challenging lighting conditions. The OM SYSTEM Olympus OM-3, while it offers computational photography features, does not specify an advanced autofocus system comparable to the Sony. For photographers who prioritize quick and reliable autofocus, the Sony is likely the superior choice.
Image Stabilization
The OM SYSTEM Olympus OM-3 comes with a 5-axis image stabilization system, which is essential for reducing camera shake during handheld shooting. The Sony Alpha 7 III also features a similar 5-axis in-body image stabilization, allowing for smooth video capture and clear handheld photos. Both cameras perform exceptionally well in this regard, providing users with the tools needed for stable shots, whether in still photography or video.
Video Capabilities
When it comes to video, the Sony Alpha 7 III excels with its ability to record oversampled 4K video with exceptional detail and cinematic depth. It also supports S-Log3 and HLG for advanced color grading, making it a preferred choice for videographers. The OM SYSTEM Olympus OM-3 does not emphasize its video capabilities to the same extent, focusing instead on still photography features. For those who plan to shoot video regularly, the Sony appears to be the more robust option.
Accessories and Bundles
The Sony Alpha 7 III comes with a comprehensive kit that includes a 28-70mm lens, a 64GB Extreme PRO SD card, and various accessories such as a padded case, cleaning kit, and more. This bundle adds significant value for users who need everything to get started. In contrast, the OM SYSTEM Olympus OM-3 does not mention any included accessories in the same detail. The added value of the accessories in the Sony kit makes it a more attractive option for buyers seeking a complete solution.
Price Comparison
The price difference between the two cameras is notable. The OM SYSTEM Olympus OM-3 is priced at $1,699.99, while the Sony Alpha 7 III is listed at $1,898.00, making the Olympus about 10% cheaper. While price is a critical factor, it is essential to consider the features and capabilities each camera offers. The Olympus provides excellent value for outdoor photographers, while the Sony justifies its higher price with superior image quality and video performance.
Which should you buy?
Choosing between the OM SYSTEM Olympus OM-3 and the Sony Alpha 7 III ultimately depends on your specific needs and preferences. If you prioritize a weather-sealed design and a vintage aesthetic, along with a more budget-friendly option, the Olympus OM-3 may be the right fit for you. However, if you seek higher image quality, advanced autofocus, and superior video capabilities, the Sony Alpha 7 III is worth the investment. Each camera excels in its own right, catering to different types of photographers and their unique requirements.

