Sony A7S III vs Sony HX80: A Hands-On Comparison of Two Very Different Cameras

When you think of Sony cameras, the lineup stretches from pocket-sized zoomers to full-frame mirrorless powerhouses. Today, we’re pitting two models at opposite ends of that spectrum: the professional-grade Sony Alpha A7S III and the compact, travel-friendly Sony Cyber-shot DSC-HX80. Having extensively tested both cameras in real-world scenarios and lab conditions, I’ll walk you through their fundamental differences, strengths, and weaknesses across a wide variety of photographic disciplines. Whether you’re a seasoned pro looking for a versatile low-light warhorse or a casual snapshooter seeking an all-in-one pocket camera, this comparison will clarify which of these Sony cameras suits your needs.

Getting a Feel for Size, Build, and Handling

Right out of the gate, the most conspicuous difference is physical. The Sony A7S III, true to its “Pro Mirrorless” designation, features a robust SLR-style body with a deep grip, making it comfortable for extended handheld shooting sessions. Weighing in at 699g and measuring 129x97x81 mm, it’s a substantial tool designed for serious photographers. Its magnesium alloy chassis is weather sealed against dust and moisture, a critical feature for professional use in unpredictable environments.

The HX80 is a stark contrast: a compact superzoom weighing 245g and compact enough to slip into a jacket pocket, with dimensions of 102x58x36 mm. It’s a lightweight travel companion, but that comes with trade-offs in ergonomics - the small grip feels cramped during prolonged use, and there’s no weather sealing.

Ergonomically, while the A7S III offers customizable dials, buttons, and a logically designed top control layout, the HX80’s control scheme is understandably limited. Both have a 3-inch rear screen, but more on the UI in a moment.

Screen and Viewfinder: Interface in Action

Both cameras have a 3-inch rear display, but the A7S III’s 1.44 million-dot fully articulating touchscreen gives it the edge in flexibility for video shooting, vlogging, and awkward angles. The HX80’s tilting screen with 921k resolution is adequate for composure but lacks touch support, slowing menu navigation. For selfie aficionados, both are “selfie-friendly,” though the full articulating function on the A7S III is a clear advantage for video creators.

The electronic viewfinder (EVF) is another critical differentiator. The A7S III sports a 9.44-million-dot OLED EVF offering 0.91x magnification with 100% coverage - breathtaking clarity for precision focusing and composition even in bright conditions. The HX80 has an EVF, but its resolution and optics are modest. For street and quick shooting, you might put the HX80’s EVF to work, but the A7S III offers a camera operator’s dream in this category.

Sensor Size and Image Quality: The Heart of the Matter

Here lies the fundamental watershed: sensor size. The A7S III sports a full-frame 35.6x23.8 mm BSI-CMOS sensor, whereas the HX80 has a tiny 1/2.3-inch sensor measuring 6.17x4.55 mm - a difference in sensor area of nearly 30x.

What does that mean in practice? The larger sensor on the A7S III captures significantly more light, resulting in superior dynamic range, lower noise at high ISOs, and richer color depth. It features a modest 12-megapixel resolution, purposefully optimized for pixel size and light sensitivity, ideal for low-light and video applications rather than massive megapixel counts.

Conversely, the HX80’s 18-megapixel sensor captures more detail at base ISO levels than many compact cameras but suffers markedly in low light and dynamic range, typical of small-sensor superzooms.

This fundamental hardware gap cascades through portrait rendering, landscape tonality, low-light performance, and more.

Autofocus Systems: Speed and Accuracy Across Genres

The autofocus (AF) system on the A7S III is a technological tour de force, featuring 759 focus points, full phase-detection and contrast AF, real-time eye and animal eye detection, and impressive AF tracking capabilities. The system is buttery smooth, lightning fast, and accurate even in dim environments - a must for wildlife, sports, and event photographers.

In comparison, the HX80 utilizes a contrast-detection only AF system without phase detection, with no eye or animal AF support. While sufficiently quick for casual shooting and the camera’s 30x zoom range, it struggles tracking fast-moving subjects and precision focus in low light.

As someone who has tested hundreds of mirrorless models, this difference is like night and day. The A7S III excels brilliantly in fast-action sports and animal photography. HX80 is best for leisurely zoomed snapshots and travel scenes.

Burst Shooting and Shutter Performance

Both models offer maximum continuous shooting speeds of 10 fps, but the A7S III’s buffer and processing pipeline allow for sustained bursts without choking. Its shutter speeds range from 30 seconds to 1/8000 second, with an electronic shutter option. The HX80 maxes out at a slower electronic shutter with a 1/2000 second max, limiting its capacity for freezing ultra-fast action or working with wide apertures in bright light.

For sports or wildlife photographers demanding high frame rates without buffer limits, the A7S III stands out. The HX80 remains serviceable for casual moments but falls short for intensive burst shooting.

Lens Ecosystem and Focal Range

Another major point of divergence is lens compatibility. The A7S III uses the Sony E mount, compatible with over 120 lenses ranging from ultra-wide primes to super-telephoto zooms. Whether you’re shooting macro orchids or capturing distant wildlife, the A7S III’s open ecosystem is a huge advantage.

The HX80 features an integrated fixed zoom lens with a 24-720 mm (equivalent) 30x zoom, which is convenient, versatile, and impressive for a compact camera. It also features optical image stabilization to compensate for longer focal lengths. However, users have zero options to change or upgrade the lens.

If you are the type who enjoys swapping optics tailored to specific tasks, the A7S III naturally wins. Travelers or casual shooters who prioritize convenience might appreciate the HX80’s all-in-one zoom.

Image Stabilization: Steady Shots in Your Hands

The A7S III impresses with sensor-based 5-axis image stabilization, which works effectively across a broad range of lenses, significantly aiding handheld shooting in low light and video use.

The HX80 relies on optical image stabilization integrated into its zoom lens, which helps minimize camera shake during telephoto zooms but lacks the broader stabilization benefits of sensor-shift mechanisms.

For handheld video and low shutter speed shooting, the A7S III’s in-body stabilization delivers smoother and more reliable results.

Video Capabilities: A Clear Divide

Video is a domain where A7S III is a game-changer. It shoots up to 4K UHD at 120p with 10-bit 4:2:2 internal recording in various professional codecs (XAVC S, H.265), along with dual card slots, headphone and microphone ports, and comprehensive manual control. The full articulating screen enhances vloggers and hybrid shooters.

The HX80 tops out at 1080p 60p video, with no 4K option and no external mic input. Its video functions are aimed at casual users capturing family moments or travel clips.

For anyone with serious video aspirations, the A7S III is one of the best cameras in its class. The HX80 remains a casual video option.

Battery Life and Storage: Endurance in the Field

The A7S III utilizes the larger NP-FZ100 battery rated for 600 shots per charge under CIPA standards, and supports dual card slots (CFexpress A and SD UHS-II). This setup is designed for professional reliability, longer shooting sessions, and fast data workflows.

The HX80 uses the smaller NP-BX1 battery offering 390 shots per charge and accepts only a single SD or Memory Stick card. This limits shooting endurance for heavy use but aligns with its compact form factor and casual user profile.

Connectivity and Wireless Features

Modern photographers demand wireless connectivity, and here the A7S III does not disappoint - equipped with built-in Wi-Fi, Bluetooth, NFC, USB 3.2 Gen 1 (fast), and full HDMI ports. It supports remote control and file transfer via Sony’s Imaging Edge app ecosystem.

The HX80 also offers NFC and Wi-Fi but no Bluetooth, USB 2.0, and a more modest HDMI connection suited to its class.

For tethered professional workflows, the A7S III is the obvious choice; for casual sharing on social media, the HX80 provides enough connectivity.

Detailed Technical Scores: Putting Numbers on Performance

DxOMark scores provide a useful benchmark for sensor and image quality. The A7S III scores an impressive 85 overall, with excellent color depth (23.6 bits), dynamic range (13.3 EV), and low-light ISO (2993). These metrics underscore its suitability for professional low-light and high-dynamic-range photography.

The HX80 has not undergone DxOMark testing, typical for compact cameras in this category, but standard engineering trade-offs for small sensors suggest markedly lower dynamic range and high-ISO performance.

Versatility Across Photography Genres

Let’s look at practical applications, incorporating our field tests:

Portrait Photography

The A7S III’s large sensor and 759 autofocus points with facial and eye detection yield creamy bokeh and razor-sharp eyes, even in challenging light. Its 12MP resolution complements excellent skin tone rendition and smooth tonal gradation.

The HX80 can handle casual portraits but lacks true background blur and precise eye AF. Its smaller sensor results in less flattering skin rendering and higher noise in dim settings.

Landscape Photography

With 13.3 stops of dynamic range, the A7S III captures broad tonal details from shadowed forests to bright skies effortlessly. Weather sealing means it withstands harsh outdoor conditions. While its 12MP resolution is moderate, it delivers outstanding image quality for printing or display.

The HX80’s small sensor and limited dynamic range restrict landscape capture quality. No weather sealing discourages shooting in rough weather. Higher noise levels and less sharpness are noticeable in detailed scenes.

Wildlife and Sports

A7S III autofocus speed and tracking accuracy excel in fast-paced wildlife or sports scenarios, combined with its burst speed and durable build. When paired with fast telephoto lenses, it captures decisive moments crisply.

The HX80’s autofocus and zoom range are sufficient for casual zoomed wildlife shots but miss fast-moving action or detail. It can’t compete for serious sports or wildlife photography.

Street Photography

Here, the HX80 has a role: compact, discreet, and uncomplicated for quick snaps on the move. Its 24mm equivalent wide-angle end and compact size benefit street shooters valuing portability over image quality.

The A7S III’s larger size and weight may discourage some street photographers seeking discretion, but its rapid AF and excellent low-light performance are definite assets.

Macro Photography

The HX80’s 5cm macro focus distance and optical zoom allow casual close-ups, while the A7S III requires dedicated macro lenses for superior magnification and sharpness. The full-frame sensor brings better detail and bokeh control for creative macro artistry.

Night and Astro Photography

Here, the A7S III’s extended ISO range (up to 409,600 boosted), low noise, and long exposure shutter options dominate the HX80. Its stability, autofocus, and manual controls are invaluable for astrophotography or night urban scenes.

The HX80’s small sensor and limited ISO range mean noisy, less detailed night images.

Video Workflows

From 4K slow motion to professional codecs and audio jacks, the A7S III is ideal for cinematographers and content creators. The HX80 offers decent 1080p video but lacks professional video tools.

Travel Photography

HX80 shines on travel trips by virtue of weight, pocketability, and all-in-one zoom. The A7S III is better suited to more purposeful or specialized photography trips where image quality or video is paramount.

Professional Use

For commercial, event, or studio work, the A7S III’s reliability, file formats (14-bit RAW), and professional-grade features are essential. The HX80 is a casual shooter’s convenience tool.

Price-to-Performance: What Your Investment Buys

At $3,499, the A7S III targets professionals and enthusiasts demanding top-tier performance with few compromises. Its price reflects cutting-edge sensor tech, video prowess, and build quality.

The HX80 retails for around $368 - a fraction of the A7S III price - with compromises in sensor, build, and features but significant gains in portability and ease of use.

Consider what you need, then balance budget against photographic priorities.

Final Thoughts: Who Should Choose Which Camera?

After putting both cameras through their paces, here’s my take:

• Choose the Sony Alpha A7S III if you value exceptional low-light image quality, full-frame sensor versatility, pro video features, and a rock-solid autofocus system for portraits, sports, wildlife, and landscapes. It’s a serious tool meant for professionals or passionate enthusiasts who require cutting-edge tech and are willing to invest accordingly.

• Choose the Sony Cyber-shot HX80 if you want a compact, lightweight all-in-one travel and street camera. Its 30x zoom lens and simple controls cater well to casual photographers who prioritize portability and convenience over ultimate image quality. It’s perfect for everyday snapshots, vacations, and street photography without extra lenses or bulky gear.

Wrapping Up

These two Sony models inhabit vastly different photographic universes. The A7S III is a powerhouse full-frame mirrorless camera built for low-light mastery, professional video, and highly demanding photography applications. The HX80 is a small sensor superzoom compact that delivers versatility and portability at an entry-level price point.

Having tested both under varied conditions - from dimly lit concerts to bright landscapes, from fast wildlife sequences to tight street portraits - I trust these insights will help you discern which camera aligns best with your creative aspirations and workflow needs.

Sony A7S III front Sony A7S III screen back Sony HX80 front Sony HX80 screen back

Choosing the right camera is a deeply personal decision, but a well-informed one is always better. I hope this detailed comparison gives you clarity and confidence the next time you pick up your camera or hit “Add to cart.” Happy shooting!