Pentax 645Z vs Pentax K-3 II

Pentax 645Z advantages over Pentax K-3 II

• Larger sensor
  Medium format vs APS-C
  More sensor area. Bigger is (generally) better.
• Bigger pixels
  ~ 5.31 vs 3.91 microns
  Better low-light and dynamic range (all else equal)
• Tiltable Screen
  Tiltable vs Fixed
  Tilt the screen for shooting flexbility
• Better color depth

  Better color depth

  Color depth refers to the number of unique colors that a sensor can faithfully capture. Cameras with better color depth will demonstrate smoother transitions from one color to the next, and avoid "banding" in areas with subtle shading. (Blue skies are an example of where you might see color banding.)

  More color depth is generally better, but you'll struggle to notice a difference between two cameras with less than 1 bit of difference. Color depth above 22 bits is considered excellent.

  Want to learn more? Head over to our full glossary entry on color depth

  Color depth test data courtesy of DxO Mark.

  645Z test data on DxO Mark K-3 II test data on DxO Mark
  26.0 vs 23.6 bits
  Capture richer, more accurate colors
• 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.

  645Z test data on DxO Mark K-3 II test data on DxO Mark
  4,505 vs 1,106 iso
  Take photos in low light with less noise
• More viewfinder magnification
  0.78x vs 0.63x
  Get a bigger view of the scene through the eye-level viewfinder
• More pixels
  51.4 vs 24.4 megapixels
  Higher resolution photos
• Higher extended ISO
  204800 vs 51200 ISO
  Higher extended ISO can give more low-light flexibility