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Estimating Power Consumption: Olympus E-1 Scott Kirkpatrick Where does the power go? Major components Imager (analog + A2D), compression asic, DSP, memory and memory management, USB LCD for viewing pictures, histogram, etc. Lens controls – autofocus, autoexposure

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Estimating power consumption olympus e 1 l.jpg

Estimating Power Consumption:Olympus E-1

Scott Kirkpatrick


Where does the power go l.jpg
Where does the power go?

  • Major components

    • Imager (analog + A2D), compression asic,

      DSP, memory and memory management, USB

    • LCD for viewing pictures, histogram, etc.

    • Lens controls – autofocus, autoexposure

    • Shutter and mirror mechanisms

    • Startup stuff – e.g., the dust-buster

  • Controls available to the photographer

    • Manual operation

    • Use of standby power-down

    • The “half-press”

    • Choice of Tif, RAW, JPG and quality level of output

  • Emphasise maximizing the number of pictures

    per battery charge


How to measure this l.jpg
How to measure this

  • Use a computerized external power supply

  • Operate with battery out of camera

    • (does this make it operate differently

      • For example, it won’t go into standby state

  • Fix voltage at 9V, monitor current used on a PC through GPIB card, connection to power supply




Taking and saving pictures of various sizes l.jpg
Taking and saving picturesof various sizes

From left: TIFF, SHQ, HQ, SQ, Raw file



Effect of most available controls l.jpg
Effect of most available controls

  • Matter less than the basic cost of operation

  • Battery is 1.5 A-hr (4X what a cellphone has). This covers 7.5 hr of operation with no pictures taken. Basic cost of operation is 0.2 A.

  • Taking a picture, focusing the lens, momentarily increases workload to .25 or .3 A. Still 5 to 7.5 hrs of operation.


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