Samsung SL720 vs Sony Alpha A6400: A Thorough Comparison from an Experienced Photographer’s Lens

Choosing the right camera can be a challenging process, especially when comparing two drastically different models like the Samsung SL720 ultracompact and the Sony Alpha A6400 advanced mirrorless. I’ve personally tested thousands of cameras over the past 15 years, examining everything from sensor performance to ergonomics, autofocus systems, and real-world usability. In this detailed comparison, we’ll explore how these two cameras stack up across multiple photography disciplines and use cases, helping you decide which is the better fit for you.

Understanding the Cameras at a Glance

Before diving deeper, let's first put both cameras on the home stretch for the raw physical and technical comparison:

• Samsung SL720: Announced in 2009, an ultracompact fixed-lens point-and-shoot with a 12MP 1/2.3" CCD sensor.
• Sony A6400: A 2019 flagship APS-C mirrorless camera designed for advanced enthusiasts and professionals, offering 24MP CMOS sensor and Sony’s sophisticated autofocus.

This size and build contrast alone foreshadows many performance differences. The SL720’s pocketable, lightweight form factor suits casual shooting and everyday portability. The A6400, while much larger and heavier, caters to those seeking high performance and system expandability.

Design, Build Quality, and User Interface

Ergonomics dictate how naturally a camera feels in hand during real shooting sessions. I assessed their handling and button layout carefully.

• Samsung SL720
  • Ultra compact dimensions (92x61x23mm) weighing just 168g.
  • Fixed lens and minimal manual controls; no dedicated dials for exposure or ISO.
  • Non-articulating 2.7-inch, 230k-dot fixed LCD. No viewfinder.
  • Simple menu system designed for beginners, but limited in customization.
• Sony A6400
  • Rangefinder-style mirrorless body at 120x67x50mm, 403g weight.
  • Extensive manual controls including top dials for shutter speed, exposure compensation.
  • 3-inch tilting touchscreen LCD with 922k-dot resolution.
  • High-resolution electronic viewfinder with 0.7x magnification, 100% coverage.
  • Customizable buttons and intuitive menu designed for pro workflows.

The SL720’s fixed, small LCD limits composition flexibility and makes outdoor viewing difficult. The A6400’s articulating touchscreen and high-res EVF greatly enhance composing in varied lighting and shooting angles. I found the Sony much more comfortable for extended use and complex shooting scenarios.

Sensor Technology and Image Quality

Image quality is ultimately paramount. Sensor type, size, and resolution dictate resolution, low-light ability, dynamic range, and color fidelity.

• Samsung SL720
  • 12MP 1/2.3” CCD sensor measuring 6.08x4.56mm (sensor area ~27.7mm²).
  • Max ISO 1600 (no booster ISO), limited noise control by today’s standards.
  • CCD sensors generally produce good color but limited dynamic range and high noise above ISO 400.
  • No raw format support; only JPEG output.
• Sony A6400
  • 24MP APS-C CMOS sensor measuring 23.5x15.6mm (sensor area ~366.6mm²) - more than 13x bigger sensor area.
  • Wide native ISO range 100-32000 (expandable to 102400).
  • Excellent dynamic range (~13.6 EV), color depth (~24 bits), and low-light performance.
  • Full raw support offering post-processing flexibility.

In my extensive lab testing and field use, the A6400’s sensor delivers vastly superior image quality - cleaner files at high ISO, exceptional detail retention, and smoother gradations suitable for professional use. The Samsung, using older CCD tech and smaller sensor, produces softer images with limited dynamic range, more suited for casual snapshots.

Autofocus System: Speed, Accuracy, and Versatility

AF system responsiveness can make or break photography in fast or unpredictable environments like wildlife or sports.

• Samsung SL720
  • Contrast-detection AF with no phase detection.
  • Single AF point, no tracking, no face or eye detection.
  • Relatively slow acquisition and frequent hunting, especially in low light.
  • No continuous or predictive AF capabilities.
• Sony A6400
  • Hybrid AF system with 425 phase-detection and 425 contrast-detection points.
  • Real-time Eye AF for humans and animals, plus face detection.
  • Continuous AF and tracking at up to 11fps burst rates.
  • Reliable performance even in dim conditions down to -2 EV.

I tested autofocus under challenging wildlife and street shooting scenarios with the A6400. It consistently nailed subject tracking and focus acquisition while the SL720 lagged noticeably and was frustrating for fast-moving subjects.

Image Stabilization and Shutter Performance

• Samsung SL720
  • No built-in image stabilization.
  • Mechanical shutter speeds from 8sec to 1/1500 sec.
• Sony A6400
  • No in-body stabilization but benefits from optically stabilized E-mount lenses.
  • Shutter speeds range from 30sec to 1/4000 sec.
  • Up to 11fps with continuous autofocus and exposure tracking.

I found the lack of IBIS on the A6400 occasionally noticeable with slower lenses, but versatile lens options mitigate this. The SL720’s slower max shutter speed and lack of stabilization limit low-light or motion freezing capability.

Video Capabilities: Quality and Features

Videographers will find a staggeringly different proposition between these two.

• Samsung SL720
  • Limited video: 640x480 max resolution at 30fps, saved as Motion JPEG.
  • No 4K, no advanced codecs, no mic input.
• Sony A6400
  • 4K UHD (3840×2160) at 30fps with full pixel readout, no pixel binning.
  • Full HD 1080p up to 120fps for slow motion.
  • Supports mic input but lacks headphone jack.
  • Advanced H.264 XAVC-S codec, suitable for professional editing.

The A6400 excels as a hybrid camera for video - delivering clean, high-resolution footage with decent codec choices. The Samsung, designed before 4K video adoption, is merely an entry-level snapshot device with weak video output.

Battery Life and Storage

• Samsung SL720
  • Uses rechargeable SLB-10A battery, capacity and longevity not officially specified.
  • Uses SD/SDHC/MMC cards.
• Sony A6400
  • NP-FW50 battery, rated for approx 410 shots per charge (CIPA).
  • Supports SD/SDHC/SDXC and Memory Stick DUO (UHS-I).

While both cameras have a single card slot, the Sony’s longer battery life confirmed in my field use and extensive menu power-saving options offer greater endurance for extended shooting days.

Lens Ecosystem and Expandability

This is where system cameras, like the Sony A6400, truly shine.

• Samsung SL720
  • Fixed 28-102mm equivalent lens (3.6x zoom, f/2.8-5.7).
  • No lens changing or upgrades.
• Sony A6400
  • Compatible with 121+ native Sony E-mount lenses.
  • Wide range from ultra-fast primes to super-telephoto zooms for wildlife and sports.
  • Accessory ecosystem includes flashes, microphones, grips, and remote controls.

If you prioritize versatility, especially across genres like macro, wildlife, or portraiture, the A6400 stands apart with its lens flexibility.

Connectivity and Wireless Features

• Samsung SL720
  • No wireless connectivity.
  • USB 2.0 port only.
• Sony A6400
  • Built-in Wi-Fi, Bluetooth, NFC for instant image transfer and remote control.
  • HDMI output for external monitors/recorders.

The connectivity feature gap clearly favors the Sony - enabling modern workflows such as fast social media sharing or tethered shooting.

Performance for Different Photography Disciplines

To bring our comparison full circle, I evaluated both cameras on key photography genres using a systematic approach that focuses on the factors most important in each.

Samsung SL720 front Samsung SL720 screen back Sony A6400 front Sony A6400 screen back

Portrait Photography

• Samsung SL720
  • Decent skin tone reproduction but limited by small sensor dynamic range.
  • Background blur limited by fixed lens aperture and small sensor.
  • No eye detection AF means less accurate focus on eyes.
• Sony A6400
  • Large APS-C sensor captures fine skin texture and smooth tonality.
  • Lens options enable creamy bokeh from fast primes.
  • Real-time Eye AF ensures tack-sharp eyes even on moving subjects.

Portrait shooters seeking sharp eye focus and pleasing background separation won’t find serious competition to the A6400 in this segment.

Landscape Photography

• Samsung SL720
  • Lower dynamic range restricts highlight and shadow detail retrieval.
  • Limited resolution (12MP) reduces large print potential.
  • No weather sealing for harsh conditions.
• Sony A6400
  • 24MP resolution captures landscapes in impressive detail.
  • 13.6 EV dynamic range preserves both highlights and shadows.
  • Weather-sealed body improves durability outdoors.

The A6400 is clearly the more suitable tool for serious landscape photography, especially in challenging environments.

Wildlife and Sports Photography

• Samsung SL720
  • Slower, contrast-only AF hinders capturing fast-moving wildlife.
  • Limited zoom and no telephoto lens options.
• Sony A6400
  • Fast hybrid AF with tracking and eye-detection ideal for active subjects.
  • Compatible with powerful telephoto zooms.
  • Burst shooting at 11fps locks action fluidly.

Wildlife and sports photographers will appreciate the A6400’s responsiveness and lens flexibility, which the SL720 simply cannot match.

Street and Travel Photography

• Samsung SL720
  • Compact size and lightweight make it easy to carry all day.
  • Fixed lens may limit creative framing but also simplifies operation.
• Sony A6400
  • Larger than the SL720 but still pocketable with small primes.
  • Tilting touchscreen and silent shutter add discretion.
  • Longer battery life suits day-long shoots.

For casual travel or street photographers prioritizing portability over advanced controls, the SL720 remains an option. The A6400, however, balances performance and compactness well for enthusiasts.

Macro and Night/Astro Photography

• Samsung SL720
  • Macro focusing down to 5cm is decent for casual close-ups.
  • Limited low-light performance hampers night photography.
• Sony A6400
  • Superior manual focus aids macro precision.
  • High ISO and long exposure capabilities excel for astrophotography.

I found the A6400 much more reliable for low-light and macro work due to its advanced sensor and manual focus support.

Professional Workflow and Reliability

• Samsung SL720
  • JPEG-only output limits post-processing.
  • Modest build quality and no environmental sealing.
• Sony A6400
  • Supports raw files for professional editing.
  • Robust build with some weather resistance.
  • Wide accessory compatibility integrates smoothly into pro workflows.

For professionals requiring reliability and flexibility, the A6400 is far preferable.

Final Performance Scores and Recommendations

These charts summarize the Samsung SL720 and Sony A6400’s ratings across technical and genre-specific tests - clearly showing the A6400’s superiority in nearly all areas except size and simplicity.

Pros and Cons Summarized

Samsung SL720
Pros:

• Ultra compact and lightweight
• Easy to use for beginners
• Affordable price point (~$119)

Cons:

• Limited image quality and dynamic range
• No raw support or advanced controls
• Poor autofocus performance
• No video or wireless features

Sony A6400
Pros:

• Excellent APS-C sensor performance
• Industry-leading autofocus with real-time Eye AF
• 4K video with microphone input
• Robust build with weather sealing
• Extensive lens and accessory ecosystem
• Built-in Wi-Fi and Bluetooth

Cons:

• Larger and heavier than compacts
• No in-body stabilization
• Pricey (~$898 body only)

Who Should Buy Which?

• Choose Samsung SL720 if:

  • You want a straightforward, pocket-sized camera for casual snapshots.
  • Budget is a primary concern.
  • You do not require advanced image quality or manual controls.

• Choose Sony A6400 if:

  • You’re a serious enthusiast or professional seeking high image quality and performance.
  • You require fast, reliable autofocus for portraits, sports, wildlife, or street.
  • You want a hybrid stills/video camera with professional features.
  • You value a large lens ecosystem for creative flexibility.
  • You need a camera capable of handling diverse and demanding shooting conditions.

Conclusion: Modern Versatility vs. Classic Convenience

Having tested both cameras extensively, the decision comes down to your photographic ambitions and budget. The Samsung SL720 was an appealing option back in 2009 for its simplicity and compactness but is now vastly outclassed by modern mirrorless cameras like the Sony A6400.

The A6400 offers a compelling mix of performance, technological innovation, and system expandability that serves photographers across every genre and scenario. While it requires a larger upfront investment and learning curve, its image quality, autofocus accuracy, video prowess, and professional integration remain stellar standards even years after release.

In my hands-on experience, the Sony A6400 earns my strong recommendation for anyone serious about photography and video who wants one camera system to grow with their skills and creative vision.

If you’re still undecided or have specific needs not covered here, feel free to ask - as always, I’m here to help you pick the best gear for your photographic journey.