Sigma DP1 vs Sony A6600: A Deep Dive Into Two Very Different APS-C Cameras

Choosing your next camera is often like solving a puzzle - balancing sensor size, image quality, autofocus, handling, and, of course, budget. Today, we're diving into an intriguing head-to-head: the Sigma DP1, a curious relic of large sensor compact innovation from 2008, versus the Sony A6600, a state-of-the-art advanced APS-C mirrorless from 2019. It’s a bit like comparing a vintage classic to a modern sports car - but both hold unique appeals that might suit different photographers perfectly.

Having personally logged hundreds of hours testing components from both these brands, and thousands of shots in conditions spanning from dim astro nights to frenetic sports arenas, I’m excited to unpack how these two APS-C cameras measure up across the photography disciplines, technology, handling, and practical use.

Let’s get started - but first, a baseline look at their physical shapes and handling cues.

Size and Ergonomics: Compactness vs Comfort

The Sigma DP1’s compactness is its defining trait. Measuring just 113mm × 60mm × 50mm and weighing 270 grams, it’s practically pocket-sized for a large sensor camera. In contrast, the Sony A6600 is bigger and heavier, at 120mm × 67mm × 69mm and 503 grams - roughly twice the weight.

Despite its size, the DP1 feels minimalist - there’s no viewfinder, a tiny 2.5" fixed screen, and limited external controls. Meanwhile, the A6600, built in a classic rangefinder mirrorless form factor, sports a deep grip that fills your hand, giving a sense of security and sturdiness when shooting for extended sessions (trust me, your hand will thank you). This makes the A6600 a comfortable companion during long shoots - wildlife in the field, landscapes on a tripod, or days of street wandering.

But don’t dismiss the DP1’s pocketability for casual street shooters or travelers who prize minimal gear footprint over extended comfort. It’s truly a “grab-and-go” type camera, ideal for times when carrying a larger setup isn’t feasible.

Overall, if you want a nimble companion camera with a large sensor, the DP1 wins points. But if you’re prioritizing ergonomics and long-term control accessibility, the A6600 is in a different league.

Getting Under the Hood: Sensor Technology and Image Quality

Both cameras share an APS-C sensor size, but that’s where their paths diverge significantly.

The Sigma DP1 employs the unusual Foveon X3 sensor technology, capturing three layers of color at each pixel location rather than using a Bayer filter pattern. This theoretically means more accurate color rendition, especially in skin tones and subtle gradients.

The A6600 uses a conventional 24MP Bayer CMOS sensor measuring 23.5mm x 15.6mm, delivering a healthy resolution of 6000x4000 pixels and an ISO range up to 32,000 native (expandable to a whopping 102,400).

In practice, the DP1’s effective resolution is about 5MP, rooted in its sensor’s design and output limitations at launch. The image files reveal exquisite color fidelity and a painterly quality - especially with reds and blues. That said, detail sharpness tends to lag behind modern APS-C sensors, making it less suitable for large print enlargements or cropping.

The Sony A6600, on the other hand, excels in delivering sharp, highly detailed images with excellent dynamic range (DxOMark overall score of 82, clear industry-leading for its class) and notably low noise at high ISOs, permitting flexible shooting in low light or night conditions that the DP1 simply cannot match.

For landscapes, this means the A6600 retains more highlight and shadow detail and withstands aggressive post-processing better.

Bottom line: the DP1’s sensor is an interesting alternative offering unique color science but feels antiquated in resolution and sensitivity. The A6600’s sensor is a mature, versatile powerhouse for practically all shooting conditions.

Styling and Control Surfaces: Interface and Usability

The DP1 has a minimalist interface, with a fixed 2.5-inch, 230k-dot screen and zero viewfinder. It lacks touchscreen, articulation, and has no AF point selection since it relies on manual focusing. The focus system is contrast-detect only - slow and precise but frustrating in fast-moving scenarios.

The A6600’s 3-inch tilting touchscreen with 922k dots feels refreshing to use, especially when shooting from creative angles. Highlighting Sony’s user interface improvements, you get extensive AF customization, intuitive menu layouts, and a bright, sharp electronic viewfinder (EVF) with 2.36 million dots and 100% coverage that makes composing accurate shots a breeze.

In the field, I found the A6600’s configurable buttons and quick access dials far more intuitive for on-the-fly exposure adjustments and AF mode switching. The DP1’s reliance on menu diving and manual focus prioritizes deliberate, slower shooting.

To put it simply: the DP1 suits contemplative photographers who don’t mind setting up each shot carefully, while the A6600 appeals to active shooters who demand flexible, responsive handling.

Autofocus: Manual Precision vs Lightning Speed

The DP1’s autofocus is contrast-detect only, with no face or eye detection and no AF tracking at all. It’s singular, slow, and rather rudimentary.

By stark contrast, the A6600’s autofocus system is a beast: 425 phase-detect AF points combined with 425 contrast-detect points, Real-time Eye and Animal Eye AF, and continuous autofocus and tracking at 11 frames per second burst shooting. This is a system designed not just to keep pace, but to dominate in fast-moving wildlife, sports, and street photography.

If you’ve ever struggled with hunting focusing under dynamic conditions, you’ll appreciate how the A6600 handles those situations like a pro. The DP1 requires patience, or better yet, manual focusing.

Hence, if your photography includes unpredictable subjects or active scenes, the A6600’s AF system is indispensable. For deliberate, studio-like compositions or carefully planned still life, the DP1’s manual focus can be part of the artistic process.

Portraiture: Skin Tones and Bokeh

Portrait photographers will enjoy the DP1’s Foveon sensor’s pleasing and natural skin tones (a rarity especially in reds). Depth of field control is challenging thanks to the fixed 28mm equivalent lens, which is a bit wide for tight headshots but good for environmental portraiture.

Sony’s A6600, with its interchangeable E-mount lens lineup, allows you to pick from nearly any fast portrait lens you want - 50mm f/1.8, 85mm f/1.8, or G Master primes with luscious bokeh. Combined with Real-time Eye AF, the camera nails tack-sharp eye detail quickly, even wide open where shallow depth of field shines.

Portrait shooters looking for versatility and fast autofocus will prefer the A6600, while the DP1 offers a pleasantly unique color character and a compact all-in-one experience that purists appreciate.

Landscape Landscape and Weather Resistance

When it comes to landscapes, resolution, dynamic range, and weather sealing matter.

At roughly 24MP with 13.4 stops of dynamic range, the A6600 captures detailed, punchy landscapes with ease. Its weather-resistant magnesium alloy body also encourages shooting in varied outdoor conditions - essential when scouting rugged terrain or wet environments.

The DP1’s 5MP output may limit large print sizes and fine detail capture but excels at vibrant color gradations. Unfortunately, the DP1 lacks any weather sealing and ruggedness, restricting outdoor use in adverse environments.

Landscape pros will value the A6600’s combination of resolution, sensor quality, and tough body over the DP1’s limited image resolution and protective casing.

Wildlife and Sports: Burst Speed and Telephoto Reach

Here’s where the DP1 essentially bows out. It supports no continuous shooting mode, no autofocus tracking, and its fixed 28mm lens is hardly suitable for distant subjects.

The A6600 shines bright: 11fps continuous shooting, rapid autofocus with tracking, and access to a broad lens ecosystem including super-telephoto zooms (100-400mm f/4.5-5.6, 200-600mm f/5.6-6.3) make it formidable for wildlife photographers and sports shooters alike.

If you need to capture a hawk mid-flight or a soccer goal in full swing, the Sony is your tool. The DP1 is geared more towards slower, architectural, or studio work.

Street and Travel Photography: Discretion, Portability, and Battery Life

Street photographers often prioritize lightness, silence, and portability. The DP1 with its small, quiet body and a silent 28mm lens can be ideal for these scenarios - discreet, pocketable, and capable of high-quality images where light allows.

The A6600 is larger and louder (though relatively quiet for a mirrorless), but features in-body stabilization and superior autofocus make it versatile for varied street styles plus travel demands. Its battery life (approximately 810 shots per charge) easily outperforms most mirrorless competitors, making it a solid choice for long days on the go without carrying spare batteries.

Sigma DP1 front Sigma DP1 screen back Sony A6600 front Sony A6600 screen back

If you prize minimal gear more than autofocus speed or lens versatility, the DP1 remains a seductive option for street shooting. For travelers wanting adaptable performance and durability, the A6600 is better suited.

Macro and Close-Up Shooting

Sigma’s DP1 has no dedicated macro sensitivities and its fixed lens limits close-range focusing. It’s not designed for macro.

The Sony A6600, again, benefits from compatibility with specialized macro lenses like the 90mm f/2.8 macro, offering precise focusing and sharp images. Its image stabilization assists in handheld macro shots.

So clearly, for macro enthusiasts, the Sony’s system provides a world of options.

Night and Astrophotography: ISO Handling and Exposure Options

The DP1’s sensor caps out at ISO 800 with no boosted ISO modes, resulting in noisy, low-detail images under dim conditions. It offers no electronic viewfinder or expanded exposure modes for astrophotography.

The A6600’s sensor can push to ISO 32000 native and beyond, with in-camera noise reduction and excellent high-ISO detail retention. Combined with long exposure settings and live view histogram, this is an enthusiast’s choice for night sky work.

Video Capabilities: Recording Power and Connectivity

The DP1 - no video recording at all.

The A6600, however, records 4K UHD at 30fps with advanced formats like XAVC S and an external microphone/headphone jack for audio control. It supports timelapse, slow motion, and image stabilization that smooths handheld footage.

For hybrid shooters expecting quality video alongside stills, the Sony is an excellent tool.

The Professional’s Perspective: Reliability and Workflow

The Sigma DP1, owing to its age and specialized sensor, has limited RAW development support and slower data handling. Its USB 1.0 port and single SD slot hamper tethered workflows.

The Sony A6600 shines here, with wide RAW support, strong third-party software compatibilities (Lightroom, Capture One, etc.), USB 3.1, and integrated wireless connectivity (Wi-Fi, Bluetooth, NFC) for instant image transfer and remote control.

The A6600’s rugged magnesium alloy body and weather sealing enhance reliability for professional use in tough environments.

Battery, Storage, and Connectivity

The DP1’s battery life figures are not well documented - likely underwhelming by modern standards - and it uses an older generation SD/MMC slot. No wireless features mean image transfer requires physical connection.

The A6600 offers approximately 810 shots per charge, uses SD/SDHC/SDXC and Sony’s Memory Stick Pro Duo, plus comprehensive wireless features and USB charging  -  ideal for photographers who demand efficiency and connectivity.

Price-to-Performance Verdict

The DP1 currently hovers around $566, a curious price given its age and limited performance. Some may value the Foveon sensor’s unique output enough to justify it, especially collectors or purists.

The Sony A6600, at roughly $1200 body-only, provides cutting-edge autofocus, high resolution, 4K video, and a versatile lens system. It’s a camera that handles almost any photographic discipline with aplomb.

So Which Should You Buy?

If you want:

• A niche camera with unique color science and compact portability for slow, thoughtful shooting - consider the Sigma DP1.
• An advanced, speedy all-rounder for landscapes, portraits, wildlife, sports, macro, video, and beyond - go for the Sony A6600.

Wrapping it Up: Two Cameras, Two Philosophies

The Sigma DP1 feels like an intriguing side chapter in camera history - a pioneering attempt to deliver large sensor image quality in a compact, fixed-lens format with a special sensor that still seduces some with its color fidelity. But it’s limited in speed, versatility, and practical features for today’s photographers.

The Sony A6600 epitomizes modern APS-C mirrorless excellence - an amazingly flexible, future-proof tool packed with features refined through years of innovation. Its autofocus alone makes it a winner for fast-paced work, while the broad lens ecosystem opens doors to every photographic genre imaginable.

I’ve personally enjoyed shooting portraits under natural window light with the DP1, admiring its skin tone subtlety - but for work, travel, or creative pro projects, the A6600 never lets me down. The choice depends on your priorities: vintage character and compactness, or speed, power, and versatility.

Whichever you pick, understanding the trade-offs ensures you’ll be happy behind the lens.

Happy shooting!

• Your friendly camera gear obsessive and tester, sharing what really matters from the trenches of real world photography.