• APS-C 369.7mm2
  • 10.1 megapixels
  • ISO 100 - 1600
  • APS-C 369.0mm2
  • 14.8 megapixels
  • ISO 100 - 6400

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Differences

Canon 40D advantages over Sigma SD1 Merrill

  • Lens selection
    Excellent vs Limited
    Better lens selection gives you more options
  • Less expensive
    $1299 vs $2299 (MSRP)
    Save money for lenses or accessories
  • Bigger pixels
    ~ 6.10 vs 5.00 microns
    Better low-light and dynamic range (all else equal)
  • Fast startup
    ~0.40 vs 4.5 sec
    Faster startup lets you catch the moment
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • More cross-type AF points
    9 vs 1
    Cross-type AF points improve autofocus performance
  • Less shutter lag
    0.13 vs 0.38 sec
    Focus and take a photo quickly (wide angle)
  • Faster JPEG shooting
    6.4 fps vs 4.1 fps
    Faster JPEG shooting (burst mode)
  • Bigger JPEG buffer
    Unlimited vs 7 shots
    Take more JPEG shots before waiting (burst mode)

Sigma SD1 Merrill advantages over Canon 40D

  • More dots on screen
    460k vs 230k dots
    Can mean greater resolution or a brighter screen
  • More pixels
    14.8 vs 10.1 megapixels
    Higher resolution photos
  • Doesn't require an AA filter
    Yes vs No
    A unique sensor design provides sharp photos without moiré
  • Higher extended ISO
    6400 vs 3200 ISO
    Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

  • Eye-level viewfinder
    Both provide
    You'll be able to frame photos even when the sun is out
  • Internal flash
    Both provide
    Useful in a pinch for fill flash
  • Pentaprism viewfinder
    Both provide
    Much better viewfinder picture fidelity
  • Hot shoe
    Both provide
    Off-camera flashes open new possibilities
  • Bulb shutter
    Both provide
    Hold the shutter open manually for long exposures

Common Weaknesses

  • Focus peaking
    Neither provide
    Your camera will highlight what's in focus
  • Tilt-swivel screen
    Neither provide
    Tilt and swivel the screen for maximum shooting flexibility
  • In-Camera Image Stabilization
    Neither provide
    Reduces the effects of camera shake at slower shutter speeds
  • Touchscreen
    Neither provide
    Interact with your camera just like your smartphone
  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • Tiltable Screen
    Neither provide
    Tilt the screen for shooting flexbility
  • Built-in Wi-Fi
    Neither provide
    Share your photos wirelessly
  • NFC
    Neither provide
    Simplifies pairing your camera with supported phones
  • Built-in Bluetooth
    Neither provide
    Always-on wireless connectivity
  • Built-in GPS
    Neither provide
    Geotag your photos
  • On-sensor phase detect
    Neither provide
    Usually improves live view and video AF performance
  • External Mic Jack
    Neither provide
    Improved sound fidelity when shooting video
  • HDMI out
    Neither provide
    Use HDMI output to monitor or review video
  • Dual card slots
    Neither provide
    Gives you more storage flexibility
  • Headphone jack
    Neither provide
    Monitor audio recording while you shoot video
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

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Kit with 18-200mm lens
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  • Kit with 17-50mm lens
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Review Excerpt

The Competition

Compared to Canon 50D

Canon 40D
Canon 50D
  • $1299
  • APS-C
  • Bigger pixels
  • Longer stills battery life
  • $1000
  • APS-C
  • Fast startup
  • HDMI out

Compare Canon 40D vs Canon 50D

Sigma SD1 Merrill
Canon 50D
  • $8492
  • APS-C
  • Doesn't require an AA filter
  • Wider angle kit lens
  • $1000
  • APS-C
  • Lens selection
  • Less expensive

Compare Sigma SD1 Merrill vs Canon 50D

Compared to Nikon D300S

Canon 40D
Nikon D300S
  • $1299
  • APS-C
  • Less shutter lag
  • Bigger JPEG buffer
  • $1697
  • APS-C
  • Fast startup
  • Higher effective ISO

Compare Canon 40D vs Nikon D300S

Sigma SD1 Merrill
Nikon D300S
  • $8492
  • APS-C
  • More pixels
  • Doesn't require an AA filter
  • $1697
  • APS-C
  • Lens selection
  • Fast startup

Compare Sigma SD1 Merrill vs Nikon D300S

Compared to Sony DSLR-A550

Canon 40D
Sony DSLR-A550
  • $1299
  • APS-C
  • Lens selection
  • Bigger pixels
  • $859
  • APS-C
  • Less expensive
  • In-Camera Image Stabilization

Compare Canon 40D vs Sony DSLR-A550

Sigma SD1 Merrill
Sony DSLR-A550
  • $8492
  • APS-C
  • Pentaprism viewfinder
  • More viewfinder magnification
  • $859
  • APS-C
  • Lens selection
  • Less expensive

Compare Sigma SD1 Merrill vs Sony DSLR-A550

Compared to Sony A77

Canon 40D
Sony A77
  • $1299
  • APS-C
  • Lens selection
  • Less expensive
  • $1899
  • APS-C
  • Tilt-swivel screen
  • Focus peaking

Compare Canon 40D vs Sony A77

Sigma SD1 Merrill
Sony A77
  • $8492
  • APS-C
  • Bigger pixels
  • Doesn't require an AA filter
  • $1899
  • APS-C
  • Tilt-swivel screen
  • Lens selection

Compare Sigma SD1 Merrill vs Sony A77

Compared to Nikon D500

Canon 40D
Nikon D500
  • $1299
  • APS-C
  • Bigger pixels
  • Internal flash
  • $1598
  • APS-C
  • Shoot 4K video
  • Touchscreen

Compare Canon 40D vs Nikon D500

Sigma SD1 Merrill
Nikon D500
  • $8492
  • APS-C
  • Bigger pixels
  • Internal flash
  • $1598
  • APS-C
  • Lens selection
  • Shoot 4K video

Compare Sigma SD1 Merrill vs Nikon D500

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