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Estimating Power Consumption: Olympus E-1

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

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  1. Estimating Power Consumption:Olympus E-1 Scott Kirkpatrick

  2. 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

  3. 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

  4. Startup, half-press, shutdown (AE,AF)

  5. Startup, focus, shutdown (MF)

  6. Taking and saving picturesof various sizes From left: TIFF, SHQ, HQ, SQ, Raw file

  7. Focusing my heaviest lens (200 mm)

  8. 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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