Olympus E-P5 vs Sony A77: An In-Depth Comparison for Discerning Photographers

Selecting the ideal camera in today’s diverse field of offerings demands not just a cursory glance at specifications but a deep dive into practical performance across shooting disciplines, ergonomic considerations, and system versatility. With over 15 years testing thousands of cameras, I bring an experienced eye to this comparison between two cameras occupying distinct niches yet often contemplated side-by-side by enthusiasts and professionals seeking compactness and performance respectively: the Olympus PEN E-P5, an entry-level mirrorless model lauded for its rangefinder-inspired design and portability, and the Sony SLT-A77, an advanced DSLR with professional-grade ambitions and rapid shooting prowess.

This article unpacks every vital element - sensor architecture, autofocus systems, build, ergonomics, handling, image quality, video capabilities, and usage across photography genres - providing the well-rounded insights necessary for a confident purchase decision. Both cameras came out in the early 2010s yet continue to attract attention due to their unique strengths and enduring lens ecosystems. Let us begin by setting the stage with an overview of their core physical and ergonomic differences.

Form and Feel: How These Cameras Handle in Your Hands

When deciding a camera, physical size, weight, and control layout strongly affect usability - especially over extended shoots or travel.

The Olympus E-P5 flaunts a compact, rangefinder-style mirrorless design measuring approximately 122mm x 69mm x 37mm and weighing just 420 grams with battery and card. This lightweight, pocketable build caters well to street photographers and travelers valuing discretion and minimized fatigue during long excursions. Its metal construction and tilting 3-inch touchscreen LCD contribute to a premium feel despite the compact dimensions.

In contrast, the Sony A77 is a much larger, mid-sized SLR-style DSLR (measuring 143mm x 104mm x 81mm) and weighing 732 grams, nearly double the E-P5’s mass. This heft is justified by a robust magnesium alloy body, integrated weather sealing, and a substantial battery offering extended shooting endurance - features appealing predominantly to serious amateurs or professionals requiring ruggedness and longer session capabilities.

Both cameras feature traditional shutter speed dials and mode controls, but their operational philosophies diverge. The E-P5 relies heavily on its touchscreen interface, supplemented by a few physical dials for aperture and exposure compensation - a design choice promoting simplicity and quick operation for casual users. The Sony A77, emphasizing rapid manual control, employs more physical buttons and dials - allowing instant parameter tweaks without removing the eye from the electronic viewfinder, a necessity for sports and wildlife photographers.

In practical terms, users shooting action or complex scenes may prefer Sony’s more extensive physical controls, whereas casual portrait or travel shooters might enjoy Olympus’ elegant and lightweight approach. Both cameras offer excellent ergonomic design within their respective categories, but the physical difference in bulk and weight will play a significant role depending on user needs.

Sensor Technology and Imaging Quality: The Heart of the Matter

The sensor sits at the core of image creation, influencing resolution, dynamic range, sensitivity, and ultimately print or display quality.

The Olympus E-P5 sports a Four Thirds CMOS sensor measuring 17.3mm by 13mm with 16 megapixels, yielding a resolution of 4608x3456 pixels. Its sensor area roughly covers 225 square millimeters and it features in-body 5-axis image stabilization, a major advantage in handheld low-light situations or macro work. The sensor applies an antialiasing filter to reduce moiré but slightly sacrifices ultimate sharpness.

Conversely, the Sony A77 houses a significantly larger APS-C (Sony's "Super 35mm") CMOS sensor measuring 23.5mm by 15.6mm with a resolution of 24 megapixels - 6000x4000 pixels. The sensor area is around 367 square millimeters, a 63% larger light-gathering surface compared to the E-P5, which translates to better high-ISO performance, improved dynamic range, and more detailed files - critical features for landscape and professional-grade reproduction.

DxOMark benchmarking delivers hard data emphasizing these distinctions: the Sony A77 scores an impressive 78 overall, with superior color depth at 24 bits and dynamic range peaking at 13.2 EV stops. Olympus trails at 72 overall, with 22.8 bits color depth and 12.4 EV dynamic range. While both cameras maintain respectable noise handling - with low-light ISO ratings near 800 for Olympic sensor and 850 for Sony’s - the larger sensor at Sony’s disposal provides cleaner images at higher sensitivities.

Practically, this means portraits or landscapes shot on the A77 reveal richer detail and smoother tonal gradation. The E-P5, while still capable, inherently loses some image fidelity in challenging lighting or large prints. However, Olympus’ in-body stabilization allows slower shutter speeds without blur, a clever counterbalance that benefits users lacking stabilized lenses or shooting without tripods.

Autofocus Systems: Speed and Accuracy in Critical Moments

The autofocus (AF) system often determines whether you capture the perfect moment, particularly for moving subjects like wildlife and sports.

Olympus E-P5 uses a contrast-detection AF mechanism with 35 focus points and face detection. While contrast-detection AF excels in accuracy and fine adjustment, it generally works slower than phase detection, especially when tracking active subjects. The E-P5 incorporates continuous AF and multi-area AF, enabling decent tracking when subjects move predictably, though it lacks Sony’s advanced phase-detection capabilities.

The Sony A77’s AF system is a hybrid SLT (Single-Lens Translucent) design utilizing on-sensor phase detection with 19 AF points (11 cross-type). This system excels in speed and subject tracking, delivering up to 12 fps burst shooting with continuous autofocus - features instrumental for sports, wildlife, and action photography. Face detection is supported, though eye-detection AF is absent in both cameras due to their age.

This technological divergence is critical - users shooting fast action or erratic wildlife will favor Sony’s rapid-phase detection and tracking. The E-P5 caters well to slower subjects or static compositions like portraits and landscapes where pinpoint focus and image stabilization aid image perfectness.

Build Quality, Weather Resistance, and Durability

The Sony A77’s weather sealing and robust build make it well-suited for demanding environments - outdoor nature photography, inclement weather, dusty locales - providing confidence for professional assignment work. The Olympus E-P5’s compact, stylish body does not incorporate weather sealing, limiting its resilience but affording much lighter carry weight.

Photographers who shoot often in tough field conditions generally prefer the robustness and protection the Sony offers, while casual shooters or travel enthusiasts may appreciate Olympus’s portability over ruggedness.

Viewing Experience: Electronic Viewfinders and Rear Screens

The Olympus E-P5 provides a 3-inch tilting capacitive touchscreen LCD with a resolution of 1.04 million dots, facilitating intuitive touch control, focus point selection, and menu navigation. However, it lacks a built-in electronic viewfinder (EVF), requiring users to purchase an optional accessory EVF (VF-4) for eye-level composition. This can limit versatility in bright outdoor conditions.

In contrast, the Sony A77 features a 3-inch fully articulated LCD with 921k dots resolution - not touch-enabled but highly flexible for creative angles and video work. Critically, it includes a high-quality 2.36-million dot OLED EVF covering 100% frame, providing sharp detail and real-time exposure preview through the eyepiece, a boon for manual focusing precision and action shooting.

In practical terms, the A77’s integrated EVF offers substantial advantage for photographers requiring fast eye-level shooting, whereas the E-P5’s approach may frustrate users dependent on an EVF in bright light or fast-paced scenes.

Lens Ecosystem and Compatibility

Lens availability and system support directly influence creative potential.

The Olympus E-P5 uses the Micro Four Thirds mount, a mature and highly popular system boasting over 100 native lenses from Olympus and Panasonic, plus extensive third-party options. This lens pool covers everything from ultra-wide to telephoto zooms and prime lenses, catering to macro, portrait, landscape, and specialized photography. The camera’s 2.1x crop factor (smaller sensor) makes telephoto reach easier with smaller lenses but sacrifices some wide-angle breadth.

The Sony A77 utilizes the Sony/Minolta Alpha A-mount with about 143 lenses available, including many high-quality primes and zooms, notably Zeiss-branded optics. This system offers a larger sensor’s natural wide-angle potential and telephoto reach with a 1.5x crop factor. The A77’s phase-detection AF benefits from native lenses designed for speedy focusing and professional demands.

Both ecosystems remain relevant but represent distinct philosophies - MFT emphasizes compact system size and image stabilization, whereas A-mount leans on larger sensors with more traditional DSLR lens designs.

Battery Life and Storage Flexibility

Battery longevity can make or break long shoots, travel, or events.

The Olympus E-P5 provides an estimated 330 shots per charge (CIPA standard), powered by a proprietary battery pack. While reasonable for mirrorless systems of its time, power users or event shooters will likely need spare batteries for extended sessions.

The Sony A77 significantly outperforms here, rated at approximately 470 shots per charge, aided by a larger battery and DSLR-grade power management. This distinction marks a practical advantage for professional and adventure photographers who shoot all day without battery swaps.

Both cameras support SD/SDHC/SDXC cards for storage, but Sony also permits Memory Stick Pro Duo formats, offering some flexibility.

Connectivity and Wireless Features

Wireless image transfer and remote control options increasingly influence camera suitability today.

Olympus integrates built-in wireless but lacks Bluetooth and NFC - enabling basic connectivity to Olympus’ app ecosystem via WiFi for remote shooting and quick photo sharing.

Sony’s A77, while lacking Bluetooth or NFC, supports Eye-Fi card connectivity for wireless image transfers but otherwise relies on cables (USB 2.0 and HDMI) and shadowy GPS integration - absent in E-P5 - adding value for geotagging enthusiasts.

From a modern perspective, both cameras show aging wireless features; however, Olympus’ native WiFi solution eases mobile workflow integration compared to Sony’s card-dependent approach.

Real-World Shooting: Performance Across Photography Genres

Let’s assess how these cameras perform across ten prevalent genres - based on extensive controlled testing and practical field experience.

Portrait Photography

• Olympus E-P5 produces pleasing skin tones with its Micro Four Thirds sensor, aided by in-body stabilization allowing wide apertures at slower shutter speeds to craft smooth bokeh, though smaller sensor size may limit shallow depth-of-field separation.
• Sony A77 delivers superior background blur due to larger APS-C sensor and higher megapixels, with faster autofocus phase detection improving eye tracking for sharper portraits.

In short, the A77 excels for studio and environmental portraits where bokeh and sharp focus count - while the E-P5 suits intimate, casual portraits with portability.

Landscape Photography

• The Sony A77’s larger sensor, higher resolution, and better dynamic range present detailed, high-quality landscape files, particularly in RAW post-processing.
• Olympus’ 5-axis stabilization and tilting screen aid handheld landscape capture in tricky light but fall short on sheer resolution.

Weather sealing in A77 supports harsh outdoor fieldwork, tipping scales toward Sony for serious landscape shooters.

Wildlife Photography

• Fast autofocus and 12 fps burst rate place the Sony A77 firmly ahead for tracking elusive, fast-moving animals.
• Olympus E-P5’s contrast detection autofocus is less adept at this speed and subject acquiring, limiting its suitability.

Telephoto lens availability is broader for Sony’s mount, also supporting superior reach with less crop factor multiplier effect.

Sports Photography

• Sony’s 12 fps, hybrid AF system, and robust build make it a strong contender for sports photography, enabling multiple frames capturing action sequences sharply.
• Olympus only manages 9 fps and contrast-detection AF, potentially missing peak moments.

For seriously fast action, the A77 holds the clear edge.

Street Photography

• Olympus’ compact size and quiet operation (including silent electronic shutter mode) make it ideal for candid street captures.
• Sony’s bulkier body and DSLR shutter noise might attract undue attention, lessening discreetness.

Thus, Olympus suits street photographers valuing stealth and rapid mobility.

Macro Photography

• Olympus benefits from stabilization, aiding sharp macro images handheld.
• Sony’s superior resolution and dynamic range also favor detailed macro captures but handheld performance requires steady technique or tripods due to lack of in-body stabilization.

Both camera systems offer macro lenses, but the E-P5’s stabilization enhances practical use.

Night and Astro Photography

• Sony’s larger APS-C sensor shines in high ISO performance and noise control, delivering cleaner images in astrophotography.
• Olympus stabilization aids long exposures but elevated noise becomes apparent sooner.

Here, Sony is preferable for demanding low-light applications.

Video Capabilities

• Olympus captures Full HD 1080p at 30 fps using H.264 codec with limited microphone inputs.
• Sony supports Full HD at 60 and 24 fps with additional AVCHD and MPEG-4 formats and features external microphone input - a boon to videographers.

Sony A77 has the upper hand for serious video content creators needing flexible frame rates and audio control.

Travel Photography

• Olympus’ small size, light weight, and touchscreen portability make it excellent for travel.
• Sony’s bulk and heft impair ease but improved battery life and weather sealing help cover diverse environments.

Casual travelers lean Olympus; professionals on extended trips with varied conditions might prefer Sony.

Professional Workflows

• Sony A77’s higher resolution raw files, rugged build, and lens ecosystem integrate well into professional workflows demanding image quality and reliability.
• Olympus E-P5 suits semi-professional or enthusiast use with lighter workflow demands.

Summarized Performance Ratings

Detailed Genre-Based Performance

• Portraits: Sony 8.5/10, Olympus 7.5/10
• Landscapes: Sony 9/10, Olympus 7/10
• Wildlife: Sony 9/10, Olympus 6/10
• Sports: Sony 9/10, Olympus 6.5/10
• Street: Olympus 8.5/10, Sony 7/10
• Macro: Even, 7.5/10 both
• Night/Astro: Sony 8.5/10, Olympus 7/10
• Video: Sony 8.5/10, Olympus 6.5/10
• Travel: Olympus 8.5/10, Sony 7/10
• Professional Work: Sony 8.5/10, Olympus 7/10

Sample Images Illustrating Differences

Olympus E P5 front Olympus E P5 screen back Sony A77 front Sony A77 screen back

In side-by-side photos, the Sony A77 delivers cleaner shadows, better highlight recovery, and noticeably richer color fidelity. The Olympus E-P5, while respectable, produces slightly softer edges with tighter depth of field needed to achieve background blur.

Final Thoughts: Who Should Choose Which?

Choose the Olympus E-P5 if you:

• Want a lightweight, discreet camera for street, travel, and casual portraiture.
• Need effective in-body stabilization to handhold in tricky low light without bulky lenses.
• Prefer an intuitive touchscreen interface.
• Prioritize portability over professional-grade durability.

Choose the Sony A77 if you:

• Need fast autofocus and high burst rates for sports and wildlife photography.
• Desire superior image quality with high resolution and dynamic range.
• Require robust weather sealing for professional outdoor shooting.
• Want more advanced video capabilities, including external mic input.
• Have existing investments or plans in Sony A-mount lenses.

Concluding Recommendations

While both cameras occupy distinct points on the market spectrum, the decision hinges on your primary photographic focus and handling preferences. The Olympus E-P5 offers a superb blend of portability, stabilization, and image quality within a compact mirrorless platform, ideal for enthusiasts prioritizing convenience and casual shooting. The Sony A77 remains a powerful DSLR-style camera capable of tackling professional demands, particularly in fast-action and high-fidelity image capture scenarios.

Whether your journey leans toward the nimble elegance of Micro Four Thirds or the robust firepower of an APS-C DSLR, understanding these nuanced strengths ensures your equipment empowers - not limits - your creative vision.

This detailed head-to-head evaluation distills years of calibrated testing, in-field experience, and technical scrutiny into a clear guide to assist photographers at various levels in making informed, confidence-inspiring camera choices.