Pentax 645D vs Sony A58

Pentax 645D advantages over Sony A58

• Larger sensor
  Medium format vs APS-C
  More sensor area. Bigger is (generally) better.
• Bigger pixels
  ~ 6.06 vs 4.31 microns
  Better low-light and dynamic range (all else equal)
• Fast startup
  ~0.70 vs 1.9 sec
  Faster startup lets you catch the moment
• Higher effective ISO

  Higher effective ISO

  Maximum effective ISO is an estimate of the highest sensitivity at which a camera can capture excellent quality photos.

  Cameras with higher effective ISO will be better choices for indoor photography, night shooting, and indoor sports photography, especially if you intend to make large prints.

  You can learn more at our glossary entry.

  Maximum effective ISO test data courtesy of DxO Mark.

  645D test data on DxO Mark A58 test data on DxO Mark
  1,262 vs 753 iso
  Take photos in low light with less noise
• Top deck display
  Yes vs No
  Check settings with a screen on top of the camera
• More cross-type AF points
  11 vs 3
  Cross-type AF points improve autofocus performance
• Higher-res screen
  307k vs 154k pixels
  More detail on the screen lets you judge focus and composition
• More viewfinder magnification
  0.78x vs 0.57x
  Get a bigger view of the scene through the eye-level viewfinder
• More pixels
  40.0 vs 20.1 megapixels
  Higher resolution photos
• Dual card slots
  Yes vs No
  Gives you more storage flexibility
• Lacks anti-aliasing filter
  No Filter vs Filter
  Enjoy sharper photos
• Bigger JPEG buffer
  19 vs 8 shots
  Take more JPEG shots before waiting (burst mode)
• Bigger RAW buffer
  16 vs 6 shots
  Larger buffer for RAW shots (burst mode)