OM SYSTEM Olympus OM-3 Silver Micro Four Thirds vs Sony a7 IV Full Frame Mirrorless
Updated August 2026 — OM SYSTEM Olympus OM-3 Silver Micro Four Thirds wins on build quality, Sony a7 IV Full Frame Mirrorless wins on video features and autofocus.
The OM SYSTEM Olympus OM-3 is a budget-friendly option with creative features, while the Sony a7 IV excels in image quality and advanced technology.
Why OM SYSTEM Olympus OM-3 Silver Micro Four Thirds is better
Price
The Olympus is $349.01 cheaper.
Weather Sealing
The Olympus has an IP53 rating.
Creative Features
The Olympus offers unique computational photography options.
Why Sony a7 IV Full Frame Mirrorless is better
Image Quality
The Sony has a 33MP sensor.
Autofocus
The Sony features 759 AF points.
Video Capabilities
The Sony supports 4K at 60p.
Overall score
Specifications
| Spec | OM SYSTEM Olympus OM-3 Silver Micro Four Thirds | Sony a7 IV Full Frame Mirrorless |
|---|---|---|
| Sensor | 20MP BSI | 33MP Exmor R |
| Stabilization | 5-axis | 5-axis |
| Viewfinder | 2.36m-Dot OLED | 3.68m-Dot OLED |
| ISO Range | 200-6400 | 100-204800 |
| Video Resolution | 1080p | 4K 60p |
Dimension comparison
Price Comparison
The OM SYSTEM Olympus OM-3 is priced at $1,699.99, while the Sony a7 IV is listed at $2,049.00. This makes the Olympus about 17% cheaper than the Sony model. If budget is your primary concern, the Olympus could be the more attractive option. The price difference of $349.01 could be significant for photographers looking to save while still obtaining a quality mirrorless camera.
Build Quality
The OM SYSTEM Olympus OM-3 features a vintage-styled premium metal body, designed for durability and aesthetics. It carries an IP53 rating, which ensures it is dustproof and splashproof, making it suitable for various outdoor conditions. In contrast, the Sony a7 IV lacks specific weather sealing details but is also designed with high-quality materials to withstand heavy use. While both cameras are built to last, the Olympus offers a distinct advantage with its weather-sealed design, appealing to outdoor photographers.
Image Quality
In terms of image quality, the Sony a7 IV boasts a 33MP Exmor R back-illuminated CMOS sensor, designed for high-resolution images and excellent dynamic range. The Olympus OM-3, while lower at 20MP, utilizes a stacked BSI Live MOS sensor, which enhances low-light performance. This means that while the Sony provides higher resolution, the Olympus offers features that can produce stunning results in challenging conditions. If resolution is your priority, the Sony is the clear winner, but the Olympus holds its own with its unique capabilities.
Autofocus Performance
The autofocus system is where the Sony a7 IV excels significantly, featuring 759 phase detection AF points with 94% coverage for remarkable tracking and focus accuracy. This is particularly useful for fast-moving subjects, making it a great choice for action photography. The OM SYSTEM Olympus OM-3 does not provide specific autofocus details but includes computational photography features that enhance focus capabilities. For those who prioritize fast and precise autofocus, the Sony a7 IV is clearly superior.
Video Capabilities
When it comes to video performance, the Sony a7 IV again stands out with its ability to shoot 4K at 60p with full pixel readout and advanced features like S-Cinetone and HLG. These capabilities make it an excellent choice for filmmakers and content creators. On the other hand, the OM SYSTEM Olympus OM-3 includes S&Q Mode for slow and quick motion video, but lacks the comprehensive 4K features found in the Sony. For serious videographers, the Sony a7 IV is the better option due to its advanced video functionalities.
User Experience
The OM SYSTEM Olympus OM-3 emphasizes creative freedom through its range of computational photography features, allowing users to explore different artistic styles and effects. Features like the Creative Dial offer various profile controls and art filters. The Sony a7 IV, with its 3.68 mega-dot Quad-VGA OLED viewfinder and high refresh rate, provides a smooth and responsive shooting experience. While both cameras are user-friendly, the Olympus caters more to those who prioritize creativity, while the Sony focuses on advanced technical performance.
Accessories and Bundles
The Sony a7 IV comes bundled with a Deco Gear camera bag, tripod, extra battery, dual charger, and software, providing a comprehensive starter kit for new users. This bundle adds significant value, especially for those who may not already own camera accessories. The OM SYSTEM Olympus OM-3 does not have a bundle listed, which may require additional purchases for essential accessories. If you're looking for an all-in-one package, the Sony a7 IV offers better initial value.
Which should you buy?
Choosing between the OM SYSTEM Olympus OM-3 and the Sony a7 IV ultimately boils down to your specific needs as a photographer or videographer. The Olympus is more budget-friendly, offers a robust weather-sealed design, and excels in creative features, making it ideal for those who prioritize creativity and outdoor photography. Conversely, the Sony a7 IV provides superior image resolution, advanced autofocus, and exceptional video capabilities, making it perfect for professionals seeking top-tier performance. If price is a major factor, the Olympus offers excellent value, but for those looking for cutting-edge technology, the Sony is worth the investment.

