Sony A33 vs Sony A57: An Expert Comparison of Two Entry-Level APS-C DSLRs

Choosing the right camera can be a daunting task, especially when the models come from the same brand and category but are released a couple of years apart. Today, I’m digging deep into a hands-on comparison between two Sony entry-level DSLRs - the Sony A33, launched in 2010, and the slightly newer Sony A57 from 2012. Both cameras use Sony's translucent mirror technology and sit at approachable price points for enthusiasts seeking solid performance with a compact Leica-inspired SLR design.

Having tested these cameras extensively across multiple photography disciplines, I’ll unpack their detailed specs, real-world usability, image quality, autofocus, video capabilities, and lens ecosystems. My goal is to give you a thorough, balanced analysis enabling you to decide which camera suits your style, budget, and photographic ambitions.

Sony A33 (left) and Sony A57 (right): Size and ergonomics contrast

Classic Sony SLT Design and Ergonomics: Handling Two Generations

First impressions matter - and while both the A33 and A57 maintain the familiar compact SLR silhouette typical of Sony’s SLT (Single Lens Translucent) series, handling one next to the other clearly reveals their iterative evolution.

The Sony A33, lighter at 500 grams, feels nimble in hand. Its grip is modest yet comfortable enough for extended handheld use. The compact chassis offers intuitive access to controls but occasionally demands menu diving for advanced adjustments. The fully articulated 3-inch LCD at 921k dots lends considerable flexibility for creative shooting angles, supporting live view and video without fuss.

In comparison, the Sony A57 is noticeably bulkier and heavier at 618 grams, reflecting Sony’s refinement towards a more robust professional feel without sacrificing portability. The grip is deeper and firmer, lending confidence when pairing with larger telephoto lenses - something wildlife or sports shooters might appreciate. The 3-inch articulated LCD keeps the same resolution but benefits from TruBlack technology for better contrast and outdoor visibility.

Physically, the A57 is taller and slightly wider, offering a more substantial body that some photographers might find more comfortable, especially for long shoots. The button layout and top plate controls see subtle tweaks as well, introducing additional customizability and improving quick access:

Sony A33 vs A57 top control layout differences

Sensor and Image Quality: Catching the Details and Dynamic Range

Now, sensor performance is where these cameras start diverging significantly. Both employ Sony’s APS-C size sensors (23.5 x 15.6 mm), with a 1.5x crop factor and sensor cleaning mechanisms. However, the A33 sports a 14-megapixel CMOS sensor while the A57 bumps the resolution to 16 megapixels, providing a subtle but tangible difference in large print quality or cropping flexibility.

Sony A33 (14MP) vs Sony A57 (16MP) sensor resolution and technical specs

Sony’s Bionz image processor powers the A33, while the A57 likely employs an upgraded variant (unconfirmed officially), resulting in better noise handling and image processing in the newer model. This shows in DXO Mark test scores: the A33’s overall score is 70, and the A57 climbs to 75, with notable gains in low-light ISO performance (591 for A33 vs 785 for A57) and dynamic range (12.6 vs 13 stops approximate).

In practical terms, this translates to:

• Portraits: Both produce pleasing skin tones with minimal color cast, but the A57 has slightly better color depth and less noise at ISO 1600+. The sensor’s 16MP resolution enhances small detail capture and smoother tonal gradation.

• Landscape: The increased dynamic range on the A57 better protects highlights and shadows - particularly beneficial in high contrast scenes like sunrises or forest interiors. I’ve preferred the A57 for landscapes by a hair due to better detail retention and richer file latitude.

Overall, while both deliver solid JPEGs and capable RAW output, the A57’s sensor advantages are noticeable, though subtle enough that photographers on a budget might still be happy with the A33’s 14MP files.

Autofocus Systems: Speed, Accuracy, and Tracking Evolution

Sony’s pioneering translucent mirror system enables phase-detection autofocus (PDAF) even in live view mode - a huge advantage in this entry-level DSLR category. The A33 and A57 both feature 15 autofocus points with 3 cross-type sensors, but the A57 introduces refined algorithms and improves tracking capabilities.

In my tests:

• Portraiture: Both cameras lock focus quickly on faces using the face detection system. However, the A57’s improved tracking better maintains sharp focus when subjects move slightly side to side or towards the camera.

• Wildlife and Sports: The 12 fps burst rate on the A57 (vs 7 fps on A33) combined with reliable autofocus tracking makes the A57 a superior choice for action shooters. I successfully tracked moving birds and athletes with fewer missed frames or focus hunting on the A57.

• Macro: Both cameras benefit equally from phase detection’s speed during close focusing, although neither offers dedicated focus stack assistance or post-focus modes.

While both autofocus systems are competitive for their era, the A57’s improvements are clear in demanding scenarios such as fast-action or erratic subject movement.

Display and Viewfinder: Upgrading the Shooting Experience

Both models feature electronic viewfinders (EVF), a hallmark of Sony’s translucent mirror tech.

• Sony A33 EVF: 1.15 million-dot OLED panel, 100% coverage, 0.73x magnification.
• Sony A57 EVF: Higher resolution 1.44 million-dot OLED, 100% coverage, 0.7x magnification.

The A57’s EVF upgrade offers a brighter, more detailed view with reduced eye strain, which I found helpful in tricky lighting conditions and when manually focusing.

Their LCD screens share the same size (3 inches) and resolution (921k dots), but the A57 includes Sony’s TruBlack technology, which reduces reflections and improves contrast outdoors - a noteworthy advantage for travel and street shooters working in sunlight.

Sony A33 vs A57 articulated rear screen comparison

Build Quality and Weather Resistance

Both the A33 and A57 are compact SLR-style bodies aimed at entry-level photographers, so neither includes advanced weather sealing or toughened chassis materials. Neither is waterproof, dustproof, or freezeproof, so care is required in extreme environments.

However, the A57’s slightly larger, sturdier build invites larger lenses without rocking and integrates a better handgrip design for endurance during longer shoots. For casual travel or street photography in mild conditions, both cameras hold up well, but professional outdoor use requires additional protection like camera rain covers.

Lens Ecosystem and Compatibility

Sony’s adoption of the Sony/Minolta Alpha lens mount (A-mount) means both cameras enjoy access to an extensive catalogue of over 140 native lenses across f/2.8 primes, zooms, and super-telephoto options.

This rich lens ecosystem remains a huge asset for both bodies - whether you want a fast portrait prime, a versatile all-purpose zoom, or specialized macro and telephoto lenses for wildlife. I tested both with the Sony 18-55mm f/3.5-5.6 kit zoom and a Sigma 70-300mm telephoto zoom - autofocus performance and image stabilization were consistent across both models.

That said, the A57’s improved autofocus and burst rate make pairing with fast prime lenses and telephotos more rewarding when shooting action or wildlife.

Battery Life and Storage

Sony’s proprietary batteries differ between the two models:

• A33 uses the NP-FW50 battery, rated for approximately 340 shots per charge.
• A57 uses a larger NP-FM500H battery, rated for 550 shots per charge.

In real-world use, the A57’s superior battery life significantly benefits travel and event photographers, reducing downtime between charges. Both cameras support SD, SDHC, SDXC, and Sony’s proprietary Memory Stick Pro Duo cards, but only a single slot on each limits redundancy or overflow use.

Connectivity and Extras

Neither camera offers Wi-Fi, Bluetooth, or GPS natively. However, both support Eye-Fi SD cards for wireless image transfer, which was innovative at the time but generally slower and less seamless than modern built-in wireless.

HDMI output for live streaming or external monitor connection is available on both, along with microphone input ports - reaffirming their appeal to hybrid shooters.

Video Capabilities: Full HD in Handheld Packages

Video has become an essential feature even in entry-level DSLRs. Both models support:

• Full HD 1080p recording.
• Variable frame rates - A33 offering 60p and 29.97p, A57 60p and 24p.
• Formats include MPEG-4, AVCHD, and H.264.

The A57’s slightly refreshed video mode with 24p gives a more cinematic frame rate, and the increased processing power reduces noise and compression artifacts. Sensor-based image stabilization works for video on both models, although handheld footage is still best captured with steady support.

Microphone ports allow external audio capture, though a headphone jack for monitoring is absent on both.

Sony A33 screen back Sony A57 front Sony A57 screen back

Photography Genre Suitability

The strengths and weaknesses of these two cameras lend themselves differently across photography styles. Here’s how they stack up:

Overall Performance Breakdown and Scorecard

Using a weighted evaluation of sensor quality, autofocus, ergonomics, video, and value, the A57 emerges as the standout, but the A33 remains a compelling choice for budget-conscious beginners or casual shooters wanting the SLT experience.

Who Should Buy the Sony A33?

• Budget-conscious beginners drawn to an easy-to-use SLT system.
• Photographers mostly shooting portraits, casual landscapes, and family events.
• Those valuing a lighter, more compact body with a fully articulated screen.
• Users who shoot mostly JPEGs and moderate ISO ranges.
• Hobbyists happy with a 7 fps burst rate and solid but not top-tier autofocus.

The A33 packs enough punch in image quality and usability for most amateurs and social shooters willing to live with fewer advanced features.

Who Should Opt for the Sony A57?

• Enthusiasts seeking faster continuous shooting and responsive autofocus.
• Wildlife and sports photographers needing reliable tracking and more burst frames.
• Videographers wanting cinematic 24p and better video processing.
• Travelers needing longer battery life, a more visible display, and a robust grip.
• Anyone willing to spend extra for incremental but impactful performance gains.

Although pricier, the Sony A57 justifies its price with enhanced image quality, speed, and ergonomic improvements that can make a tangible difference for demanding work.

Final Thoughts: Past Meets Progress in Sony’s SLT Lineup

Working hands-on with the Sony A33 and A57 is like witnessing early and mid-generation snapshots of Sony’s ambitious translucent mirror system. While the A33 introduced compact, versatile SLT imaging with respectable image quality, the A57 built upon that foundation, refining autofocus, boosting resolution, and enhancing ergonomics.

Both offer excellent gateway cameras to entry-level DSLR photography with a broad lens ecosystem. The A33 represents smart value but shows its age in speed and sensor tech, whereas the A57 feels like a more mature platform, catering better to those aiming to grow their skills or shoot more aggressive genres.

Choosing between these two revolves around your budget, shooting preferences, and performance needs. Whichever you pick, you’re stepping into a crafted system backed by Sony’s optical heritage and innovative technology that is still appreciated by enthusiasts today.

Happy shooting! If you want more real-world insights or lens recommendations for either model, feel free to ask - I’ve spent plenty of hours behind both viewfinders and am here to help you get the most from your gear.