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Estimating Power Consumption: Olympus E-1

This document provides an in-depth analysis of the power consumption of the Olympus E-1 camera. It outlines the major components responsible for power usage including the imager, compression ASIC, DSP, and various mechanisms such as autofocus and shutter. We examine factors like standby power management and the impact of operating without a battery in the camera. Guidance is provided on measuring power consumption, optimizing battery life during photography sessions, and understanding how settings affect output quality, ultimately aiming to maximize the number of images taken per battery charge.

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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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