Sigma DP1 vs Sony A37: A Hands-On Comparison for the Discerning Photographer

Choosing the right camera is always a blend of art and science, especially when comparing two very different beasts like the Sigma DP1 and Sony SLT-A37. With over 15 years testing cameras from flashy mirrorless to budget DSLRs, I’m here to break down exactly what you get from these two models - both relics in their own right, but each with unique qualities that deserve a fresh look even years after release.

If you’re a photography enthusiast or a working pro researching cameras on a budget, this deep dive will help you understand not only specs on paper but real-world performance, usability, and value. Spoiler alert: they cater to wildly different users, and only one will likely fit your style and needs - let’s see who that is.

Setting the Stage: Sigma DP1 and Sony A37 at a Glance

Before we roll up sleeves and get into the nitty-gritty, a quick size-and-type rundown paints an immediate picture of how these cameras position themselves:

• Sigma DP1: Launched in 2008 as a large sensor compact camera featuring an APS-C sized Foveon X3 sensor and a fixed 28mm equivalent lens. It’s all about image quality in a compact form with limited autofocus and shooting flexibility.
• Sony A37: Released in 2012 as an entry-level APS-C DSLR alternative, sporting a traditional Bayer CMOS sensor, fast continuous shooting, and a versatile lens mount supporting a wide ecosystem.

By sheer size and ergonomics (above), the Sigma DP1 is svelte and pocket-friendly, a true compact, while the Sony A37 stands taller, heavier at 506g, and feels like a proper DSLR in your hands.

Build and Handling: Comfort Meets Convenience

Both cameras rely on solid construction - but with crucial differences that affect day-to-day use.

Sigma DP1

• Small body: 113 x 60 x 50mm, weighs only 270g
• Fixed 28mm lens keeps you honest but limits versatility
• Lack of viewfinder can make shooting in bright sunlight challenging
• Control layout is minimalist; no touchscreen or physical focus aids beyond manual focus ring
• A fixed 2.5" LCD with 230k-dot resolution, lacking articulation and touch (more on this later)
• No image stabilization, no weather sealing, no video mode; everything is still-photo focused
• Manual focus only, with contrast-detection AF for live view
• Limited storage via SD/MMC cards, USB 1.0 (ouch) connectivity

Sony A37

• Larger body: 124 x 92 x 85mm; heftier presence in hand but still compact for a DSLR
• Tilting 2.6" LCD with same 230k-dot resolution, but with articulation for creative angles
• Electronic viewfinder with 1440-dot resolution and 100% coverage, a big plus for composition under bright light
• 15 phase-detection autofocus points with 3 cross-type points offer reliable and fast focusing
• Sensor-based image stabilization: critical for handheld shooting versatility
• Robust built-in flash with multiple modes and compatibility with external flash guns
• 500 shot battery life, plenty for a day out or event shooting
• USB 2.0, HDMI out for tethering and playback, Eye-Fi WiFi connectivity support for wireless transfers

From the top views above, you’ll notice the Sony’s more complex button and dial arrangement tailored to faster, manual control, while the Sigma favors minimalism - intuitive in its simplicity, but frustrating if you want to tweak settings quickly.

Sensor Technology and Image Quality: The Heart of the Matter

Now for the crux. The Sigma DP1’s signature weapon is its Foveon X3 APS-C sensor (20.7 x 13.8 mm), which captures full color information on each pixel site, rather than the Bayer pattern used in typical sensors. This unique design lends itself to rich color depth and sharpness but at a meager resolution.

The DP1 outputs images at about 5 megapixels (2640 x 1760), which might make purists wince, but the color fidelity and detail in JPEGs and RAW files are surprisingly punchy at normal web/print sizes.

In contrast, the Sony A37 uses a 16MP Bayer CMOS sensor measuring 23.5 x 15.6 mm, giving you a higher native resolution of 4912 x 3264 pixels. This directly translates to more cropping ability and larger prints without quality loss.

Here's a visual sensor size and resolution comparison:

What This Means in Practice

• Sigma DP1: Ideal for photographers prioritizing color accuracy, detail in midtones, and sharpness over sheer megapixel counts. Its unique sensor excels in controlled lighting conditions (think portraits, still life, landscapes with stable tripod use) but falters in low light due to a max ISO of 800 and no image stabilization.
• Sony A37: Provides more overall flexibility with higher resolution, excellent dynamic range (~13 stops on DxOMark), and usable high-ISO performance up to 25600 (rough in practice, but decent up to 3200). This makes it better suited for fast-paced photography, low light, and cropping flexibility.

Autofocus Performance: Precision vs Speed

Autofocus is an area where the Sony A37 absolutely leaves the Sigma DP1 in the dust.

• Sigma DP1: Contrast-detection AF only, single autofocus mode, no face or eye detection. Sluggish and sometimes frustrating, especially for moving subjects.
• Sony A37: 15 point phase-detection autofocus system with 3 cross-type points. Offers continuous AF tracking and face detection, which aids in shooting dynamic scenes such as sports or wildlife.

This difference is fundamental for genres requiring tracking:

• Wildlife photographers: The A37’s burst mode at 6 frames per second paired with quick phase AF helps capture fleeting moments.
• Sports and action: A37’s quick autofocus and drive speed give it a robust edge.
• Portraits/Still life: While DP1 autofocus is slow, manual focus with peaking (albeit limited) allows for critical focusing in stable situations.

Handling Across Photography Genres

Let’s tackle how both cameras fare in popular photography disciplines.

Portraits

• DP1: The 28mm lens translates to a moderate wide angle on APS-C (28mm x 1.7 = ~47.6mm equivalent). This is decent for environmental portraits but not ideal for flattering close-ups which benefit from longer focal lengths. The Foveon sensor’s color reproduction of skin tones is exceptional, lending a smooth, natural look to portraits. However, lack of eye detection AF and slow focusing is a hurdle.
• A37: The Sony’s AF system supports face detection and works well with a range of portrait lenses. Combined with higher resolution, you get the flexibility of beautiful bokeh on faster prime lenses from the Alpha lineup.

Landscape

The Sigma DP1, with its fixed 28mm lens and Foveon sensor, excels in landscapes when you can set up carefully:

• Incredible fine detail and color depth captured on tripod
• Limited dynamic range relative to modern sensors but very usable in well-lit scenes
• No weather sealing to speak of, so be cautious outdoors

Sony A37 ups the ante with:

• Larger sensor area and greater megapixels for large prints and cropping
• Tilting screen is handy for low angle shots
• Image stabilization makes handheld landscape shots easier
• Lack of environmental sealing is a drawback for rugged conditions

Wildlife

Simply put - avoid the Sigma DP1 for wildlife unless you’re very patient:

• Slow AF, no continuous mode, low burst rate
• Fixed lens precludes telephoto reach

The Sony A37’s 6fps burst and phase-detect AF shine here, especially paired with telephoto Alpha lenses.

Sports

Sony A37’s autofocus prowess and frame rate make it a decent entry-level sports camera. The DP1 offers no chance here.

Street Photography

Here, size and discreteness matter:

• Sigma DP1 is far smaller and quieter. The lack of a viewfinder actually helps in some street situations where keeping your camera low-profile is preferable.
• Fixed lens limits framing flexibility but can be a boon for creativity.
• Sony A37 is bulkier and noisy with the translucent mirror design - less discreet.

Macro

Neither camera excels in macro photography out of the box due to fixed or no dedicated macro focus features, but:

• DP1’s manual focus precision can help in static macro subjects.
• A37 with specialized lenses and stabilization outperforms for handheld macro shooting.

Night & Astro Photography

• Sigma DP1’s lackluster ISO 800 max and noise issues make it a weak contender.
• Sony A37’s higher ISO range, stabilization, and manual controls are a definite plus under night skies.

Video Capabilities

DP1 offers no video recording at all.

Sony A37 provides:

• Full HD 1080p video at 60/30fps with decent quality for casual use
• External mic input for improved sound recording
• Limited manual control but still functional for enthusiasts

Travel Photography

• The Sigma DP1’s compact size and image quality shine if you shoot landscapes and portraits, but you’re locked into a single focal length and limited ISO.
• Sony A37 offers immense versatility with interchangeable lenses and support for varied shooting scenarios but comes with bulk and weight penalties.

Screen, Viewfinder, and Usability

Let’s peek at the rear displays and find out which camera lets you see better while you shoot.

Sigma DP1’s fixed 2.5” screen lacks touch and articulation, with low 230k-dot resolution making it hard to check fine details or focus confirmation. No viewfinder means composing in bright light can be challenging.

Sony A37 includes a tilting 2.6” LCD and an electronic viewfinder with 1440-dot resolution and 100% coverage - essential for framing accurately outdoors and shooting at odd angles.

Lens Ecosystem and Expandability

• DP1’s fixed lens design means no lens changes, which is a relief for simplicity but limiting for growth or creative experimentation.
• Sony A37 supports Sony Alpha mount lenses, including over 140 native lenses plus third-party options - from wide angle primes to massive telephotos and macro lenses. This offers massive growth potential as your skills develop.

Connectivity, Storage, and Battery Life

• Sigma DP1 has a very basic setup: SD/MMC card slot and pathetic USB 1.0 transfer speeds. No WiFi or HDMI.
• Sony A37 supports SD/SDHC/SDXC cards plus Memory Stick formats, USB 2.0, HDMI out, and even Eye-Fi wireless card support, allowing easy photo transfer.
• Battery life swings heavily in Sony’s favor, rated for 500 shots versus Sigma’s unspecified (likely under 300 shots).

Real-World Picture Quality Samples

Experience matters more than specs alone. Here, side-by-side sample images from both cameras reveal their character.

Sigma DP1 front Sigma DP1 screen back Sony A37 front Sony A37 screen back

Note how the Sigma’s images offer exquisite color gradations and crisp detail at base ISO, whereas the Sony’s higher resolution files capture more fine detail and handle shadows and highlights better.

Performance Scores and Value Assessment

Below are overall rating scores based on sensor performance, autofocus, handling, and versatility gleaned from lab tests and user experiences.

In breakdown by photography type, Sony A37 consistently leads in fast-paced and versatile use cases, while Sigma DP1 commands a niche in image quality and compactness.

Pros and Cons Summarized

Sigma DP1

Pros:

• Compact, lightweight, sleek design
• Unique Foveon sensor delivers stunning color fidelity and sharp images at low ISO
• Simple controls, well-suited for deliberate, slow shooting

Cons:

• Fixed lens limits framing freedom
• Slow AF, no continuous focus, unsuitable for action
• No image stabilization or video
• Basic connectivity and screen
• Limited ISO range, poor low-light performance

Sony A37

Pros:

• Versatile, fast autofocus with continuous modes
• 16MP APS-C sensor with great dynamic range and high ISO flexibility
• Interchangeable lens system with huge selection
• Effective in many photography genres, including sports and wildlife
• Full HD video with microphone input
• Tilting LCD and EVF for compositional control
• Good battery life and connectivity

Cons:

• Larger and heavier
• No weather sealing
• Viewfinder brightness can drain battery
• Aging model; newer alternatives offer better autofocus tracking

So, Which Camera Is Right For You?

Choose Sigma DP1 If…

• You want a portable, high-quality compact camera for landscapes and portraits
• You prioritize color accuracy and detail over megapixels
• You are a patient, deliberate shooter who likes manual focus and slow shooting
• You don’t care about video or fast autofocus
• Size and simplicity are king

Choose Sony A37 If…

• You seek a budget-friendly DSLR alternative with versatility for sports, wildlife, macro, and travel
• Fast autofocus, burst shooting, and interchangeable lenses matter
• You want decent video capabilities and better connectivity
• You frequently shoot in varying light conditions and need stabilization
• You care about battery life and viewfinder convenience

Final Thoughts

Despite being early 2000s and early 2010s cameras, Sigma DP1 and Sony A37 both carry niche strengths. The DP1 is a cult favorite among color and detail obsessed photographers, almost a unique tool rather than a daily workhorse. The Sony A37, meanwhile, represents the classic entry-level APS-C DSLR alternative - versatile, capable, and solid when you need reliable autofocus and speedy shooting.

If I were to recommend for most amateur or semi-pro enthusiasts today, especially with a budget near $500, the Sony A37 offers way more bang for your buck in 2024’s world - just be prepared for some bulk and older technology steps. The Sigma DP1 remains a gem for artists who love image purity and minimal gear.

Whichever you pick, bring your passion, and these cameras will reward you with timeless images.

Happy shooting, and remember - the best camera is always the one you have in your hands.

Appendix: Quick Reference Specs Table

Thanks for reading - if you’d like me to compare other cameras or discuss lenses for these mounts specifically, just say the word!