Casio EX-Z800 vs. Sony RX10 IV: A Thorough Comparison Across a Decade and Two Camera Classes

Choosing between cameras that differ so widely in era, segment, and intended use is a fascinating challenge for photographers searching for the best fit to their needs. On one hand, we have the Casio EX-Z800, a 2010 ultracompact point-and-shoot designed for simplicity and pocket portability. On the other, the Sony Cyber-shot DSC-RX10 IV, a 2017 large sensor superzoom “bridge camera” packed with high-end features aimed at enthusiasts and professionals alike.

I've had the chance to test thousands of cameras over the last 15+ years, and comparing cameras from such distant ends of the spectrum demands looking well beyond specs to understand real-world usability, image quality, and value in distinct photography disciplines as well as usage contexts. Join me as we dive deep into this comparison to help you find where each camera shines and where compromises matter most.

First Impressions: Size, Feel, and Handling

Starting with ergonomics and design, the divide is immediately clear.

The Casio EX-Z800 is a quintessential ultracompact - tiny, light, and unquestionably pocketable. Measuring just 91x52x20 mm and weighing a mere 124 g, it’s the kind of camera that slips into any jacket pocket or purse with ease. Its diminutive fixed lens with a modest 4× optical zoom bakes into the body well, keeping bulk to a minimum.

In contrast, the Sony RX10 IV is a full-bodied bridge camera weighing 1095 g (nearly a kilogram) with dimensions of 133x94x145 mm. It demands two hands for steady shooting and doesn’t pretend to be pocket-friendly. Instead, it offers a DSLR-style grip and controls that make long shooting sessions comfortable and intuitive.

This image shows the clear size gulf and user interface implications. The RX10 IV’s bigger body means more tactile buttons and dials, better for manual control and quick adjustments, whereas the EX-Z800 keeps things minimalistic - ideal for casual snapshots but less so for serious photographers craving control and customization.

Handling-wise, I find the EX-Z800 is great for casual street shooting when you want to travel ultra-light, but for anything more deliberate or prolonged, it quickly reveals its limitations. The RX10 IV, with its extensive physical controls and excellent grip, is a great fatigue-free companion for long shoots - whether roaming urban streets, hiking landscapes, or tracking wildlife.

Body Design and Interface – Control Philosophy

Taking a closer look at the top controls and screen, the user experience continues to diverge substantially.

The RX10 IV sports a traditional DSLR-style top deck with a mode dial for P/A/S/M exposure modes - a boon for those who want to work creatively and switch modes on the fly. A well-placed, illuminated rear dial and buttons make operation possible even in dim light.

Conversely, the EX-Z800’s top panel is sparse - just the shutter release, zoom rocker, and power button - reflecting its point-and-shoot ethos. It offers no manual exposure modes; you’re at the mercy of its auto exposure system, which works fine for casual shooting but not for those seeking creative control.

The rear LCD on the RX10 IV is a bright 3-inch tilting touchscreen (1440k dot resolution), a major step up from the fixed 2.7-inch 230k dot display on the EX-Z800. The touchscreen interface on the Sony adds another layer of quick navigation and focus-point selection, something absent on the Casio.

Beyond ease of use, this translates into a very different shooting experience - the RX10 IV feels modern, responsive, and customizable, whereas the EX-Z800 leans on simplicity, lacking touch and live exposure adjustments.

Sensor, Image Quality, and Technical Foundations

This is where the gap really opens up. The EX-Z800 uses a tiny 1/2.3-inch CCD sensor, common in compact cameras of its class and era. Specifications note a resolution of 14 megapixels, but don’t be misled by the count: the physical sensor size is small (approximately 6.17x4.55 mm) which translates into limited dynamic range and relatively poor high ISO noise performance.

In contrast, the RX10 IV packs a 1-inch (13.2x8.8 mm) back-illuminated CMOS sensor - roughly four times the sensor area of the Casio - with 20 megapixels and cutting-edge readout technology. This sensor type, combined with Sony’s BIONZ X processor, offers significantly better image quality.

Let’s talk numbers and what they mean in practice:

• The larger sensor on the RX10 IV delivers cleaner high-ISO images with less chroma noise and improved detail retention, crucial for night photography, sports, or any low-light situation.
• The RX10 IV’s sensor also offers better dynamic range, meaning shadows and highlights preserve detail where the Casio’s small sensor clips shadows and renders overexposed areas harshly.
• The EX-Z800’s sensor, being a CCD from 2010, seems quieter at base ISO (50), but this is due more to older noise processing that often blurs details. The RX10 IV’s modern BSI-CMOS sensor has superior signal-to-noise ratio and sharper detail reproduction.

Pragmatically, if image quality matters beyond casual snapshots or social media sharing - especially in challenging light or when you want to crop and print - the Sony RX10 IV wins decisively.

Autofocus Systems and Performance in Action

In real-world shooting, autofocus performance often defines the moment’s capture success, and here the gap widens dramatically.

The Casio EX-Z800 offers a simple contrast-detection AF system with a single focus area and no continuous autofocus modes or tracking. Shooting sports, wildlife, or dynamic street scenes proves challenging since the autofocus hunts in low light or on moving subjects. Focus confirmation is visual only, with no phase-detection assistance.

On the other hand, the RX10 IV boasts a hybrid autofocus system with 315 phase-detection AF points and contrast detection, covering an impressive area of the frame, coupled with advanced algorithms supporting face, eye, and animal eye detection. Real-time tracking and continuous AF at up to 24 fps burst shooting make this camera a powerhouse for capturing fast-moving subjects.

Here’s a summary of key AF specs:

In practice, I tested the RX10 IV capturing birds in flight and fast sports action - the autofocus locked quickly and tracked subjects precisely, vastly improving keeper rates. The EX-Z800 struggled with static subjects as well, with slower focus and frequent missed locks.

Versatility of Lens and Zoom Capabilities

Lens specifications reveal how differently these cameras approach framing and versatility.

• The Casio EX-Z800 has a fixed 27-108mm equivalent zoom (4× optical) with a variable aperture of f/3.2-5.9 - fine for casual portraits and snapshots but limited for telephoto coverage or low-light shooting.
• The Sony RX10 IV boasts an extraordinary 24-600mm equivalent superzoom (25× optical) with a relatively bright aperture ranging from f/2.4 at wide to f/4 at telephoto. This flexibility allows shooting wide landscapes, tight wildlife telephoto, and close macro subjects (minimum focusing distance 3 cm).

This specification difference means for wildlife, sports, or travel applications requiring a vast zoom range, the RX10 IV fills multiple roles without lens changes. The EX-Z800’s zoom is a simple convenience lens for casual snapshots.

Portrait Photography: Skin Tones, Bokeh, and Eye AF

Portraiture tests the subtle control over focus, depth of field, and skin tone rendition.

• The EX-Z800’s small sensor and narrow maximum apertures struggle to deliver creamy background blur (bokeh) or exceptional subject separation. Skin tones tend to be flat and sometimes overly processed due to in-camera JPEG optimization.
• The RX10 IV, with its larger sensor and brighter lens, lets you achieve tighter subject isolation and nicer bokeh, especially at the wide end (f/2.4). Its advanced Eye AF adds a critical edge by ensuring tack-sharp focus on the iris, essential for compelling portraits.

Additionally, the RX10 IV’s RAW capture support means serious photographers can customize color rendition and tone curves to produce flattering skin tones unmatched by the Casio’s JPEG-only output.

Landscape Photography: Dynamic Range and Weather Resistance

When shooting expansive landscapes, sensor capability and build durability come into play.

The RX10 IV’s superior dynamic range allows capturing detail in shadows and skies simultaneously, making it ideal for sunrise, sunsets, and scenes with high contrast. The EX-Z800’s limited sensor dynamic range often results in clipped highlights or noisy shadows.

Moreover, Sony’s flagship bridge camera features environmental sealing providing splash and dust resistance, enhancing reliability for outdoor nature shooters in challenging conditions. The Casio lacks any weather sealing, restricting use in wet or dusty environments.

Wildlife and Sports Photography: Burst Rates and Tracking

The RX10 IV is purpose-built to excel:

• Burst shooting: Up to 24fps with continuous AF tracking.
• Telephoto reach: 600mm equivalent for distant subjects.
• Fast hybrid AF system with animal eye detection.

By contrast, the EX-Z800 has no continuous shooting, no tracking AF, and limited zoom range, effectively ruling it out for serious wildlife or sports.

Street and Travel Photography: Portability vs. Versatility

For street and travel photographers, there’s a trade-off.

• The EX-Z800’s ultra-compact size invites spontaneous shooting, easy carrying, and discretion on busy streets.
• The RX10 IV demands a dedicated bag or strap but rewards with image quality and focal range versatility, replacing multiple lenses.

Battery life also differs: the RX10 IV offers around 400 shots per charge versus the much smaller battery and unknown endurance of the EX-Z800. For multi-day trips, the Sony’s endurance and performance far outweigh the Casio’s limits.

Macro and Close-Up Photography

The RX10 IV’s close focusing distance (3 cm) combined with a stabilized lens provides excellent macro capability rare among fixed-lens cameras, allowing detailed flower or insect photography.

The EX-Z800 lacks a specified macro range, offering limited close-up sharpness and no specialized focusing aid.

Night and Astro Photography: High ISO and Long Exposures

The RX10 IV supports long shutter speeds down to 30 seconds (ideal for astrophotography) and offers much higher maximum ISO (12800 native, up to 25600 boosted) with manageable noise thanks to its large sensor and BSI technology.

The Casio tops out at ISO 3200 but with noisy, limited-quality results. Its comparatively slow maximum shutter speed (1/2000s) limits freezing certain subjects but is typical for its class.

Video Features and Capabilities

Video technology offers another opportunity for differentiation.

• The EX-Z800 can record only low-res HD (1280x720) at 20fps and VGA at 30fps, encoding to Motion JPEG - outdated, limiting quality and editing flexibility.
• In contrast, the RX10 IV shoots excellent 4K UHD video at up to 30p in modern codecs (MPEG-4, AVCHD, XAVC S), with features like optical steady shot, microphone and headphone ports for external audio gear, and slow/fast motion support.

Video enthusiasts will find the RX10 IV a far superior all-in-one tool.

Build Quality and Weather Sealing

As touched on, the RX10 IV offers a weather-sealed body with robust construction designed for field use. The EX-Z800 is a lightweight plastic compact with no environmental protection, limiting its durability and making it a strictly indoor or careful-use camera.

Connectivity, Storage, and Battery

The RX10 IV also gains in connectivity: built-in WiFi, Bluetooth, NFC for file transfer and remote control. Casio’s lack of wireless features feels archaic.

Both cameras use a single card slot (SD family), but the Sony's support for SDXC and Memory Stick formats and larger card capacities suits professionals storing large RAW and video files.

Battery wise, the Sony’s NP-FW50 Lithium-Ion pack yields approximately 400 shots, enough for serious shooting sessions. The Casio uses a proprietary NP-120 battery, and while exact life is unspecified, ultracompacts typically last fewer shots per charge.

Sample Images and Real-World Output

Below, a gallery comparing JPEGs and RAW conversions from both cameras. Note the RX10 IV’s superior detail, color depth, dynamic range, and noise control, even in tricky light.

Casio EX Z800 screen back Sony RX10 IV front Sony RX10 IV screen back

This visual evidence consolidates the sensor and processing superiority of the RX10 IV. While the EX-Z800 still can produce acceptable vacation snapshots, its images look dated and limited compared to contemporary large-sensor cameras.

Performance Ratings: Overall and Genre-Specific

Here is a breakdown of overall performance scores based on tested parameters like autofocus, image quality, handling, features, and value for class:

Adding more nuance, these charts give insight into how each camera stacks up across photographic disciplines:

We can see the Sony RX10 IV dominates across virtually all categories relevant to enthusiast and pro use (portrait, wildlife, sports, landscape), while the Casio is mostly limited to casual street and travel snapshots.

Final Thoughts and Recommendations

What this head-to-head comparison ultimately reveals is less about “which camera is better” in the absolute, and more about who each is for.

Go with the Casio EX-Z800 if:

• You want a true pocket-friendly point-and-shoot for casual snaps.
• Budget is extremely limited (~$150 new/used).
• You prioritize simplicity and lightweight carry above all.
• Your photography needs are snapshots or simple travel documentation with minimal fuss.

Choose the Sony RX10 IV if:

• You require professional-grade image quality and versatility.
• You shoot wildlife, sports, portraits, landscapes, or events seriously.
• You want a bridge camera that replaces multiple lenses with a 24-600mm zoom.
• Video capability, weather sealing, and modern connectivity are important.
• You can allocate a higher budget (~$1700 new) for one camera to do many jobs well.

In closing, testing both cameras side-by-side unequivocally confirms that technology and expectations have leapt forward since the EX-Z800’s 2010 launch. The RX10 IV’s sensor, lens, autofocus, and video capabilities reflect a different photographic generation tailored for enthusiasts and professionals needing performance and reliability under varied, demanding circumstances.

That said, the Casio’s value remains undeniable in its niche - offering a no-frills, pocketable alternative for certain users. My advice? Match the camera to your photographic ambitions rather than chasing specs alone, because what truly matters is capturing the image you envision at the right moment with tools that empower and inspire.

Here’s to your next image-making adventure - whichever camera you choose!