Samsung ST100 vs Sony A9 II: A Deep Dive Into Ultraportable Simplicity and Professional Mirrorless Power

When you explore the world of digital cameras, it quickly becomes clear that no two models play in the same league - or with the same players. Today, we take a hard look at two very different cameras: the Samsung ST100, a compact ultracompact shooter aimed at casual users seeking portability, and the Sony Alpha A9 II, a flagship professional mirrorless powerhouse designed for sports photographers, photojournalists, and pro-level content creators.

This isn’t just about specs - you’ll get hands-on insights based on years of practical testing and real-world photography across multiple disciplines. Whether you’re choosing your first camera or upgrading to high-end pro gear, this detailed comparison will guide you through the strengths and compromises of each to find the best fit for your creative journey.

Design and Handling: Pocket-Friendly Versus Professional Grip

Right off the bat, these cameras could not be more different physically.

• Samsung ST100: Lightweight at just 155 grams and measuring a pocket-friendly 100 x 60 x 20 mm, the ST100 is made for slipping into a purse or jacket pocket. Its fixed 35-175mm equivalent lens extends confidence to casual photographers who want effortless shooting anytime.
• Sony A9 II: At 678 grams and a robust 129 x 96 x 76 mm body, the A9 II demands a substantial handgrip. The SLR-style mirrorless design balances weight well with larger lenses and includes weather sealing for demanding conditions.

The ergonomics contrast sharply. The ST100 offers a minimalist control set with a touchscreen interface, suitable for beginners or travelers who prioritize ease of use and compactness. Conversely, the A9 II boasts a plethora of customizable buttons, dials, and intuitive menus tailored for professionals needing rapid access to every vital setting.

If your photography often involves fast-paced scenarios or manual controls, the Sony’s robust layout provides significant advantages, while the Samsung’s basic design comforts casual snaps.

Sensor and Image Quality: Tiny CCD vs Full-Frame BSI-CMOS

The heart of any camera is its sensor, and here the gulf is vast.

The Samsung’s 1/2.3" CCD sensor, common in compact cameras of its time, limits dynamic range and low-light performance. Outputs are acceptable in bright light, but image noise quickly degrades quality as ISO rises above 400-800. RAW is unsupported, restricting post-processing flexibility.

By contrast, Sony’s full-frame back-illuminated CMOS sensor delivers exceptional image quality with wide dynamic range, superb low-light results, and the capacity to capture in RAW for professional editing workflows. This sensor is a major reason why the A9 II excels in demanding fields like sports and wedding photography.

Autofocus Systems: Contrast-Only vs Hybrid, with Face and Animal Eye Tracking

Autofocus is a decisive factor in many photography categories.

• Samsung ST100 employs a contrast-detection AF system with face detection as its peak capability. It has no phase-detection or subject tracking features, and focuses single-shot only.
• Sony A9 II features a sophisticated hybrid AF system with 693 phase-detection points covering approximately 93% of the frame, including real-time Eye AF for humans and animals, continuous tracking, and selectable AF areas.

The practical effect? The Sony locks focus lightning fast on moving subjects, maintaining focus through challenging scenarios from sports to wildlife. The Samsung may suffice for still subjects and quick casual shots but struggles with moving subjects or low light focusing.

Screen and Viewfinder: Fixed Touchscreen vs Tilting, Vibrant EVF

Display and viewfinder quality heavily influence usability.

Without any viewfinder, the Samsung relies solely on its 3.5" touchscreen for composing and reviewing images, which works well in bright indoor or shade conditions but can be challenging in direct sunlight.

The Sony A9 II’s high-resolution electronic viewfinder offers a crystal-clear preview with 100% frame coverage and real-time exposure simulation - essential for precision framing and exposure decisions in professional workflows.

Burst Shooting and Video: Casual Clips vs Pro-level Performance

Fast continuous shooting and video capabilities are key for action and content creators.

Samsung’s video capabilities are modest with only 720p 30fps quality and no mic inputs, limiting usability beyond casual footage. Burst rates are unspecified but generally slow, constraining capture of fast action.

Sony’s A9 II excels with 20fps silent shooting, 4K video with professional codecs, and built-in microphone and headphone jacks for audio monitoring. This balance is critical for hybrid shooters needing seamless stills and video performance.

Samsung ST100 screen back Sony A9 II front Sony A9 II screen back

Here are sample images from both to illustrate image quality differences in various lighting conditions and subject matter - from daylight landscapes to low-light events.

Build Quality and Weather Resistance: Made for Adventure vs Everyday Portability

The Sony A9 II features robust weather sealing against moisture and dust, built for professional fieldwork in unpredictable environments.

Samsung ST100 lacks environmental sealing and protective features, emphasizing portability and casual use rather than durability.

This has real implications: you can confidently use the Sony outdoors in rain or dusty conditions; the Samsung requires more care and gentle environments.

Lens Ecosystem and Expandability

The fixed lens on the ST100 is convenient but restrictive, especially if you want specialized glass for macro, wide-angle, or professional portraits.

The Sony E mount opens amazing possibilities, from ultra-wide primes to super-telephoto zooms, and specialty lenses for macro or tilt-shift applications.

Battery Life and Storage: Long-Lasting vs Basic

• Samsung ST100: Battery life details aren't listed, but ultracompacts typically offer limited endurance due to small batteries. Storage relies on microSD cards plus internal memory.
• Sony A9 II: Uses the large-capacity NP-FZ100 battery with approximately 690 shots per charge (CIPA standard) and dual SD card slots supporting high-speed UHS-II cards for overflow and backup.

Dual card slots and significant battery life are critical for professionals shooting all-day events, while the Samsung aims for casual intermittent use.

Connectivity and Wireless Features: Simple vs Comprehensive

Samsung ST100 includes basic USB 2.0 and HDMI ports but lacks wireless, Bluetooth, or NFC connectivity. The Sony A9 II embraces wireless Wi-Fi, Bluetooth, NFC, and USB 3.1, enabling rapid image transfer, remote operation, and advanced tethering.

Specialized Photography Use Cases: Who Excels Where?

Portrait Photography

• Sony A9 II: Advanced face and animal eye AF with 693 focus points delivers tack-sharp portraits with beautiful bokeh thanks to full-frame sensors and fast lenses.
• Samsung ST100: Face detection AF exists but is rudimentary; fixed small sensor limits background blur and image quality.

Landscape Photography

• Sony A9 II: Full-frame sensor offers superior dynamic range, detail, and low noise for landscapes. Weather sealing means you can shoot in harsh conditions.
• Samsung ST100: Limited dynamic range and lower resolution restrict landscape potential. No weather sealing.

Wildlife & Sports Photography

• Sony A9 II: 20 fps burst, vast AF coverage and eye tracking make it a dream camera for fast action.
• Samsung ST100: Slow focus and no tracking; slow or no burst mode limits usability for action.

Street Photography

• Samsung ST100 excels here with discretion, light weight, and quick startup.
• Sony A9 II is larger and heavier but offers silent shutter mode for quiet shooting.

Macro Photography

• Samsung ST100 has close-focus down to 5cm, usable for casual macro.
• Sony A9 II depends on lens choice for macro; excellent AF and stabilization available.

Night and Astro Photography

• Sony A9 II: Outstanding high ISO, long shutter speeds, great sensor technology.
• Samsung ST100: Limited ISO and sensor noise restrict night shots.

Video Use

• Sony A9 II wins with professional-grade 4K, good codecs, audio inputs, and stabilization.

Travel Photography

• Samsung ST100 offers pocketability and simplicity.
• Sony A9 II offers versatility but requires more packing.

Professional Workflows

• Sony A9 II supports full RAW, tethering, bracketing, and robust system integration.
• Samsung ST100 suits casual users only.

Strengths and Weaknesses Summarized

Who Should Consider the Samsung ST100?

• Casual photographers who want a stylish, pocket-sized camera for travel and everyday snapshots without fuss.
• Beginners who prefer easy automatic modes and a touch interface.
• Budget-conscious buyers seeking convenience over premium image quality.
• Users prioritizing portability over manual controls and professional features.

Who Will Benefit Most From the Sony A9 II?

• Professional photographers specializing in sports, wildlife, events, or portrait work requiring top-tier speed, accuracy, and quality.
• Enthusiasts ready to invest in a serious system with interchangeable lenses, extensive customization, and reliable weather sealing.
• Hybrid shooters needing pro-level video and audio features.
• Anyone wanting future-proof technology and seamless professional workflow integration.

Final Thoughts: Choosing Your Creative Companion

Choosing between the Samsung ST100 and Sony A9 II is really like comparing apples to super high-performance sports cars. The ST100 offers portability and simplicity for casual and beginner photographers. In contrast, the A9 II delivers cutting-edge technology designed to meet and exceed the demands of professional photography and videography.

We recommend you start by defining your shooting needs, budget, and growth ambitions. For those just beginning or wanting a second point-and-shoot camera, the Samsung ST100 fits the bill neatly. However, if you require industry-leading autofocus, image quality, burst shooting, and professional-grade video - all wrapped in a durable body - then the Sony A9 II will more than satisfy your requirements.

Try Before You Buy

If possible, spend time handling both cameras. The feel of a camera in your hands frequently determines your comfort and creative confidence. Testing lenses on the Sony system can also reveal how each option matches your personal shooting style.

Complement Your Gear

Don’t forget to explore accessories that enhance each system:

• For the Samsung ST100, consider microSD cards with higher write speeds and screen protectors.
• For the Sony A9 II, invest in fast UHS-II cards, extra batteries, external flashes, and prime lenses to unlock the camera’s full potential.

The photography world is vast and filled with incredible tools. Your camera is the doorway to your creative vision - choose one that invites you to take that next step confidently, whether you prefer the simplicity of the Samsung ST100 or the professional prowess of the Sony Alpha A9 II.

Happy shooting!

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