OM SYSTEM Olympus OM-3 Silver Micro Four Thirds vs Sony Alpha a6400 Mirrorless Camera: Compact APS-C
Updated August 2026 — OM SYSTEM Olympus OM-3 Silver Micro Four Thirds wins on build quality, Sony Alpha a6400 Mirrorless Camera: Compact APS-C wins on features and battery life.
The OM SYSTEM Olympus OM-3 offers superior build quality and creative features, while the Sony Alpha a6400 excels in affordability and video capabilities.
Why OM SYSTEM Olympus OM-3 Silver Micro Four Thirds is better
Build Quality
Rugged, weather-sealed design
Creative Features
Advanced computational photography options
Viewfinder
High-resolution OLED electronic viewfinder
Why Sony Alpha a6400 Mirrorless Camera: Compact APS-C is better
Price
Significantly cheaper at $835.90
Video Capabilities
Supports 4K video recording
Portability
Compact and lightweight design
Overall score
Specifications
| Spec | OM SYSTEM Olympus OM-3 Silver Micro Four Thirds | Sony Alpha a6400 Mirrorless Camera: Compact APS-C |
|---|---|---|
| Sensor | 20 MP BSI | 20.1 MP BSI |
| Continuous Shooting | 5 fps | 11 fps |
| Video Resolution | 1080p | 4K |
| Viewfinder | 2.36m OLED | Tiltable LCD |
| Weather Sealing | Yes | No |
Dimension comparison
Overview of the Cameras
The OM SYSTEM Olympus OM-3 is priced at $1,699.99, while the Sony Alpha a6400 is significantly cheaper at $835.90, making it about 51% less expensive. This substantial price difference can influence purchasing decisions, especially for those on a budget. Both cameras are designed for different user needs and preferences, which will be explored in more detail throughout this comparison.
Design and Build Quality
The OM SYSTEM Olympus OM-3 boasts a vintage-styled, premium metal body that is not only aesthetically pleasing but also rugged, featuring an IP53 rating for dustproof, splashproof, and freezeproof capabilities. This makes it ideal for outdoor photography in various weather conditions. In contrast, the Sony Alpha a6400, while compact and lightweight, lacks the same level of weather sealing, making it less suited for extreme conditions. The solid build of the OM-3 gives it an edge for those who prioritize durability in their photography gear.
Image Quality
Both cameras deliver impressive image quality, but they cater to different user preferences. The OM SYSTEM Olympus OM-3 features a 20 MP Stacked BSI Live MOS sensor, which is designed to perform well in a variety of lighting conditions and offers advanced computational photography features. The Sony Alpha a6400, on the other hand, comes with a 20.1MP stacked back-illuminated sensor that excels in fast-paced situations, providing enhanced subject capture with 425 phase and 425 contrast detection points. While both cameras offer great resolution, the choice may come down to how each sensor performs in specific shooting scenarios.
Photography Features
The OM SYSTEM Olympus OM-3 includes a range of computational photography features such as Live ND, Live Composite, and High Res Shot, which appeal to creative photographers looking to experiment with their shots. Additionally, the Creative Dial allows for various color profile controls and art filters. On the other hand, the Sony Alpha a6400 focuses on speed and accuracy, offering continuous shooting at up to 11 frames per second and features like real-time eye autofocus. Each camera's features cater to different styles of photography, making them appealing to distinct user bases.
Video Capabilities
Video enthusiasts may gravitate towards the Sony Alpha a6400, as it supports 4K video recording and includes multiple movie functions for time-lapse and slow/quick motion videos without post-processing. This flexibility is particularly attractive for content creators and vloggers. The OM SYSTEM Olympus OM-3, while offering high-quality video capabilities, does not specifically highlight 4K support in its features, which may be a drawback for those focused on video work. The a6400's versatility in video production gives it a considerable advantage in this category.
User Experience and Usability
With a 2.36m-dot OLED electronic viewfinder, the OM SYSTEM Olympus OM-3 provides a high-resolution display for composing shots. The camera's user interface is designed with creative controls, appealing to those who enjoy hands-on adjustments. Conversely, the Sony Alpha a6400 features a tiltable LCD screen, making it convenient for vlogging and photography from different angles. The ease of use and accessibility of features may sway users depending on whether they prioritize creative control or versatility in shooting angles.
Portability and Convenience
The Sony Alpha a6400 is compact and lightweight, making it a great option for travel and everyday use. Weighing in at a much lower price and size, it appeals to those who need a camera that is easy to carry around. The OM SYSTEM Olympus OM-3, being more robust and weather-sealed, may be slightly bulkier but offers the trade-off of durability. For travelers and casual photographers, the a6400 provides the convenience of portability without sacrificing essential features.
Price Comparison
The OM SYSTEM Olympus OM-3 is priced at $1,699.99, while the Sony Alpha a6400 is available for $835.90, making it about 51% cheaper. This significant price gap could influence budget-conscious buyers or those who are just starting their photography journey. While the OM-3 offers advanced features and robust build quality, the a6400 provides excellent value for those looking for high performance at a lower cost. The decision may ultimately depend on one's budget and specific photography needs.
Which should you buy?
Choosing between the OM SYSTEM Olympus OM-3 and the Sony Alpha a6400 ultimately depends on your individual preferences and photography needs. If you value a rugged, weather-sealed design with advanced creative features and are willing to invest more, the OM-3 is the better choice. However, if you are looking for an affordable, lightweight camera that excels in video capabilities and fast shooting, the a6400 is hard to beat. Consider your priorities—whether it's durability and creativity or portability and value—before making a decision.

