OM SYSTEM Olympus OM-3 Silver Micro Four Thirds vs Sony a5100 16-
Updated August 2026 — OM SYSTEM Olympus OM-3 Silver Micro Four Thirds wins on stabilization and features, Sony a5100 16- wins on autofocus and portability.
The OM SYSTEM Olympus OM-3 offers superior build quality and creative features, while the Sony a5100 excels in affordability and connectivity.
Why OM SYSTEM Olympus OM-3 Silver Micro Four Thirds is better
Build Quality
Premium metal body with weather sealing
Creative Features
Advanced computational photography capabilities
Viewfinder
High-resolution OLED electronic viewfinder
Why Sony a5100 16- is better
Price
Significantly lower price point
Autofocus Speed
Ultra-fast autofocus with 179 AF points
Video Capabilities
Full HD recording at higher frame rates
Overall score
Specifications
| Spec | OM SYSTEM Olympus OM-3 Silver Micro Four Thirds | Sony a5100 16- |
|---|---|---|
| Build Quality | Premium metal, weather-sealed | Plastic, no weather sealing |
| Sensor Type | BSI Live MOS | APS-C |
| Video Resolution | Not emphasized | Full HD 1080p |
| Connectivity | Limited | Wi-Fi and NFC |
| Creative Features | Advanced options | Basic settings |
Dimension comparison
Price Comparison
The OM SYSTEM Olympus OM-3 is priced at $1,699.99, while the Sony a5100 is significantly cheaper at $777.48, making it about 54% less expensive. This price difference is substantial and can be a deciding factor for many consumers. The OM-3's premium features and build quality reflect its higher price point, but for those on a budget, the a5100 offers a compelling package without breaking the bank. The decision on which camera to purchase may hinge on whether the additional features of the OM-3 justify its higher cost for your specific needs.
Design and Build Quality
The OM SYSTEM Olympus OM-3 boasts a vintage-styled, premium metal body, giving it a robust and sophisticated feel. This camera is also weather-sealed with an IP53 rating, making it dustproof, splashproof, and freezeproof, ideal for adventurers and outdoor enthusiasts. In contrast, the Sony a5100, while still stylish, has a more modern, plastic design and lacks weather sealing. Those who prioritize durability and a classic aesthetic may prefer the OM-3, while those looking for a lightweight, compact option might lean towards the a5100.
Sensor and Image Quality
The OM-3 features a 20 MP Stacked BSI Live MOS sensor, which delivers excellent image quality, particularly in low-light situations. This is complemented by advanced computational photography features, such as Live ND and Focus Stacking. On the other hand, the Sony a5100 comes with a 24 MP APS-C sensor, capturing high-resolution images with impressive detail. While the a5100 has a slight edge in megapixels, the OM-3's sensor and processing capabilities may appeal to photographers seeking versatility in various shooting conditions.
Autofocus and Performance
For fast-paced photography, the a5100 excels with its ultra-fast autofocus system, which includes 179 AF points and can shoot at 6 frames per second. This makes it a great choice for capturing action shots or spontaneous moments. Conversely, the OM-3 focuses on creative capabilities with its advanced TruePic X Processor and various computational photography features, but it may not match the speed of the a5100 in terms of autofocus. Depending on your shooting style, if speed is crucial, the a5100 may be the better option.
Video Capabilities
When it comes to video, the Sony a5100 supports Full HD 1080p recording at up to 60 frames per second, allowing for smooth and high-quality video capture. The OM-3, while it offers video capabilities, is more focused on still photography features and doesn’t emphasize video in its specifications. For vloggers or those who prioritize video, the a5100 presents a more appealing option due to its higher frame rates and user-friendly video features.
Connectivity Features
The Sony a5100 offers instant sharing via Wi-Fi and NFC, making it easy for users to connect to their smartphones and share images on social media. This is an important feature for those who enjoy sharing their photography immediately. The OM-3 does not mention similar connectivity options, suggesting it may not cater as effectively to the needs of socially connected photographers. If connectivity is a priority for you, the a5100's features may be more appealing.
Creative Features and Usability
The OM SYSTEM Olympus OM-3 stands out with its creative features such as the Creative Dial, which allows control over color profiles and art filters, enhancing the user's creative potential. Its 2.36 million-dot OLED electronic viewfinder provides a clear and detailed view, aiding in composition and shooting. While the a5100 has a 3-inch flip-up LCD, which is great for selfies and vlogging, it lacks the depth of creative options found in the OM-3. For those who enjoy experimenting with their photography, the OM-3 may provide a richer experience.
Which should you buy?
Choosing between the OM SYSTEM Olympus OM-3 and the Sony a5100 ultimately depends on your specific needs and preferences. The OM-3, priced at $1,699.99, offers premium build quality, advanced features, and enhanced creative capabilities, making it ideal for serious photographers. In contrast, the a5100, at $777.48, offers great value with its impressive autofocus, video capabilities, and connectivity features, making it suitable for casual users and vloggers. If budget is a key concern and you prioritize ease of use and connectivity, the a5100 is the way to go. However, if you're looking for a camera that excels in creative photography and durability, the OM-3 is worth the investment.

