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Compared to... Pentax Optio A10

Below you will find a studio comparison between the Casio EX-Z850 and the similarly specified Pentax Optio A10 at ISO 400.

Studio scene comparison (@ ISO 400)

  • Casio EX-Z850 : Aperture priority mode, ISO 400, Default Image Parameters,
    Manual white balance, +0.67 EV compensation
  • Pentax Optio A10: Program mode, ISO 400, Default Image Parameters,
    Manual white balance, +1.0 EV compensation
     
  • Lighting: Daylight simulation, >98% CRI
Casio EX-Z850
Pentax Optio A10
ISO 400, 1/800 sec, F4.0
ISO 400, 1/125 sec, F7.6
4,580 KB JPEG
2,523 KB JPEG

I'd certainly take the Pentax A10's slightly softer ISO 400 result over the smudgy over-processed Z850's. Note that the A10 has no manual aperture control, and it seems likely that some of the softness can be attributed to diffraction (F7.6 is a very small aperture on a lens this size).

What is interesting is that the EX-Z850 (like the Z750 before it) is almost a stop more sensitive at 'ISO 400' than the A10. By our measurements the A10 is closer to 'true' ISO 400 than the EX-Z850 (which more like ISO 600), so Casio is doing itself no favors by understating its ISO values.

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