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OM SYSTEM OM-5 Mark II Body Black Compact Light vs Sony a5100 16-

Updated August 2026 — OM SYSTEM OM-5 Mark II Body Black Compact Light wins on video and build, Sony a5100 16- wins on price.

The OM SYSTEM OM-5 Mark II excels in outdoor performance and video capabilities, making it the better choice for serious photographers. However, the Sony a5100 offers a more budget-friendly option.

Why OM SYSTEM OM-5 Mark II Body Black Compact Light is better

Weather Sealing

OM-5 Mark II is weather-sealed for outdoor use.

Video Quality

OM-5 Mark II supports unlimited 4K video recording.

Image Quality

OM-5 Mark II delivers unmatched image quality.

Why Sony a5100 16- is better

Price

Sony a5100 is significantly cheaper.

Portability

Sony a5100 is lightweight and compact.

User-Friendly

Sony a5100 is designed for casual photographers.

Overall score

OM SYSTEM OM-5 Mark II Body Black Compact Light
85
Sony a5100 16-
70

Specifications

SpecOM SYSTEM OM-5 Mark II Body Black Compact LightSony a5100 16-
SensorMicro Four Thirds24MP APS-C
Video4KFull HD
AutofocusHigh Performance179 AF Points
Weight370g256g
Weather SealingYesNo

Dimension comparison

OM SYSTEM OM-5 Mark II Body Black Compact LightSony a5100 16-

Design and Build Quality

The OM SYSTEM OM-5 Mark II is designed for outdoor enthusiasts and has a compact and lightweight build, weighing only 370g. In contrast, the Sony a5100, while also portable, features a slightly bulkier design due to its interchangeable lens system. The OM-5 Mark II is weather-sealed, making it more suitable for various outdoor conditions, a key factor for adventurers who require durability. The a5100 does not specify weather resistance, which could be a drawback for those who often shoot in unpredictable environments.

Image Quality

The OM SYSTEM OM-5 Mark II offers unmatched image quality, delivering sharp, stable, and vibrant shots. This camera excels in outdoor settings, providing robust performance for capturing the beauty of nature. On the other hand, the Sony a5100 features a 24MP APS-C sensor that captures life in high resolution, which is impressive for a mirrorless camera. However, the emphasis on outdoor photography makes the OM-5 Mark II a more compelling choice for users prioritizing image quality in varied conditions.

Autofocus Performance

The OM SYSTEM OM-5 Mark II boasts high autofocus performance, allowing photographers to capture every split second with precision. In comparison, the Sony a5100 includes an ultra-fast autofocus system with 179 AF points and a continuous shooting speed of 6 frames per second. While both cameras excel in this area, the OM-5 Mark II's emphasis on outdoor shooting may provide an edge in dynamic environments where quick focus adjustments are essential.

Video Capabilities

The OM SYSTEM OM-5 Mark II supports unlimited 4K video recording, making it an excellent choice for videographers looking to tell their stories in motion. In contrast, the Sony a5100 can record Full HD 1080p video at up to 60 frames per second, which is decent for most casual users but lacks the 4K option. The OM-5 Mark II's superior video capabilities make it a better fit for content creators who require high-quality video production.

Price Comparison

The OM SYSTEM OM-5 Mark II is priced at $1,199.99, while the Sony a5100 is significantly cheaper at $777.48, making it about 35% less expensive. This substantial price difference may appeal to budget-conscious consumers or those who do not require the advanced features of the OM-5 Mark II. However, for photographers and videographers who prioritize performance and image quality, the investment in the OM-5 Mark II could be justified.

Target Audience

The OM SYSTEM OM-5 Mark II is best suited for outdoor enthusiasts and travelers seeking a lightweight, durable camera that excels in various weather conditions. It is tailored for individuals who prioritize image and video quality during their adventures. Conversely, the Sony a5100 targets casual photographers and vloggers who desire a versatile, easy-to-use camera without needing the rugged features of the OM-5 Mark II. Each model appeals to different user needs based on lifestyle and shooting preferences.

Popularity and Sales Rank

The OM SYSTEM OM-5 Mark II holds a sales rank of 30,336, while the Sony a5100 ranks slightly lower at 41,658. This suggests that the OM-5 Mark II may have a stronger appeal among consumers seeking high-performance outdoor cameras. The better sales rank of the OM-5 Mark II could indicate its features resonate more with serious photographers, whereas the a5100 might attract users looking for a budget-friendly option.

Which should you buy?

Choosing between the OM SYSTEM OM-5 Mark II and the Sony a5100 ultimately depends on your specific needs as a photographer or videographer. If you require a compact, weather-sealed camera with exceptional image and video quality designed for outdoor adventures, the OM-5 Mark II is the clear winner despite its higher price tag. However, if you are looking for a more budget-friendly option that still offers solid performance for casual photography and video, the Sony a5100 would serve you well. Consider your shooting style, the environments you frequently capture, and your budget when making your decision.