• APS-C 328.6mm2
  • 10.1 megapixels
  • ISO 100 - 1600
  • Medium format 1,436.6mm2
  • 51.4 megapixels
  • ISO 100 - 204,800

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Differences

Canon XTi advantages over Pentax 645Z

  • Lens selection
    Excellent vs Limited
    Better lens selection gives you more options
  • Fast startup
    ~0.40 vs 1.5 sec
    Faster startup lets you catch the moment
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Thinner
    65 mm vs 123 mm
    Thinner
  • Higher max flash sync
    1/200 vs 1/125 sec
    Reduce the effect of ambient light in flash shots
  • Lighter weight
    510g vs 1555g
    Lighter weight
  • Has anti-aliasing filter
    Filter vs No Filter
    Reduces unsightly moiré in photos

Pentax 645Z advantages over Canon XTi

  • Focus peaking
    Peaker vs Non-peaker
    Your camera will highlight what's in focus
  • Larger sensor
    Medium format vs APS-C
    More sensor area. Bigger is (generally) better.
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • Better color depth
    26.0 vs 22.1 bits
    Capture richer, more accurate colors
  • Higher effective ISO
    4,505 vs 664 iso
    Take photos in low light with less noise
  • More dynamic range
    14.7 vs 10.9 evs
    Retain detail in highlight and shadows
  • Longer stills battery life
    More info 650 vs 370 shots
    Capture more photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • More cross-type AF points
    25 vs 1
    Cross-type AF points improve autofocus performance
  • Newer
    4 years vs 12 years old
    Newer cameras often support more advanced features
  • HDMI out
    HDMI out vs None
    Use an external screen to monitor or review video
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • More dots on screen
    1037k vs 230k dots
    Can mean greater resolution or a brighter screen
  • Shoots 1080p video
    Yes vs No
    You'll want this if you shoot video
  • More pixels
    51.4 vs 10.1 megapixels
    Higher resolution photos
  • Shoots 60p video
    Yes vs No
    A faster framerate can give you more editing options
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • More AF points
    27 vs 9
    More AF points improve autofocus
  • Lacks anti-aliasing filter
    No Filter vs Filter
    Enjoy sharper photos
  • Bigger JPEG buffer
    12 vs 8 shots
    Take more JPEG shots before waiting (burst mode)
  • Higher extended ISO
    204800 vs 1600 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
  • Hot shoe
    Both provide
    Off-camera flashes open new possibilities
  • Bulb shutter
    Both provide
    Hold the shutter open manually for long exposures

Common Weaknesses

  • 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
  • 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
  • Headphone jack
    Neither provide
    Monitor audio recording while you shoot video
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

Buy From

Review Excerpt

  • Phenomenal resolution and detail; Great high ISO performance; Rugged, weather-sealed body; Huge, bright viewfinder; Fast autofocus works well in low light; Swift performance for a medium-format camera; Good battery life; Shoots Full HD video

  • Quite bulky compared to an APS-C or full-frame DSLR; Autofocus points clustered near center of frame; Most lenses aren't weather-sealed or optimized for digital; Prone to aliasing artifacts (but so are most high-end cameras these days); Attracts a lot of attention from passers-by

The Competition

Compared to Pentax 645D

Canon XTi
Pentax 645D
  • $522
  • APS-C
  • Lens selection
  • Less expensive
  • $3599
  • Medium format
  • Larger sensor
  • Better color depth
Pentax 645Z
Pentax 645D
  • $5998
  • Medium format
  • Focus peaking
  • Tiltable Screen
  • $3599
  • Medium format
  • Fast startup
  • Longer stills battery life

Compared to Leica S (Typ 006)

Canon XTi
Leica S (Typ 006)
  • $522
  • APS-C
  • Less expensive
  • Lens selection
  • $21950
  • Medium format
  • Larger sensor
  • Higher effective ISO
Pentax 645Z
Leica S (Typ 006)
  • $5998
  • Medium format
  • Focus peaking
  • Tiltable Screen
  • $21950
  • Medium format
  • Thinner
  • More viewfinder magnification

Compared to Leica S (Typ 007)

Canon XTi
Leica S (Typ 007)
  • $522
  • APS-C
  • Lens selection
  • Internal flash
  • $19995
  • Medium format
  • Focus peaking
  • Larger sensor
Pentax 645Z
Leica S (Typ 007)
  • $5998
  • Medium format
  • Less expensive
  • Tiltable Screen
  • $19995
  • Medium format
  • Shoot 4K video
  • Built-in Wi-Fi

Compared to Leica S-E (Typ 006)

Canon XTi
Leica S-E (Typ 006)
  • $522
  • APS-C
  • Less expensive
  • Lens selection
  • $16900
  • Medium format
  • Larger sensor
  • Built-in GPS
Pentax 645Z
Leica S-E (Typ 006)
  • $5998
  • Medium format
  • Focus peaking
  • Tiltable Screen
  • $16900
  • Medium format
  • Built-in GPS
  • Thinner

Compared to Canon 5DS R

Canon XTi
Canon 5DS R
  • $522
  • APS-C
  • Bigger pixels
  • Internal flash
  • $3699
  • 35mm
  • Larger sensor
  • Better color depth
Pentax 645Z
Canon 5DS R
  • $5998
  • Medium format
  • Focus peaking
  • Larger sensor
  • $3699
  • 35mm
  • Lens selection
  • Less expensive
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