X-E4 will have no IBIS.. so what!

Started 3 months ago | Discussions thread
norjens Regular Member • Posts: 403
IBIS and energy

SpeedyNeo wrote:

norjens wrote:

No doubt IBIS is a major feature. The battery argument is invalid; just turn it off and you have a non-IBIS camera. They proved with X-S10 that they can make it small enough as well.


It will almost certainly be less expensive than the X-S10.

Re: battery, no, IBIS can't realistically be turned off. It does need battery when it's "off" to stay in place and not move against the camera motion direction which is its normal behavior. [snipped]

IBIS takes energy to operate because it performs work (force*distance) on the sensor package relative to the camera body's frame of reference.
Physics 101: Energy used in a reference frame = Work done in that frame.

Turning IBIS off makes it rigid with the body, meaning no travel distance relative to the body meaning no work and no need to use energy. That's what we have before IBIS; sensor attached to the sensor as a rigid body, no energy use.

One way they can make it rigid when turned off is to have some of the IBIS actuators take on a 'lock-out' position, like you do with your elbow to push without using your arm muscles, and have the opposite actuators push against that brace with a static force. Electromotors can apply a static force with a static charge from the battery, which pulls no power after startup except for a tiny amount of current leak. Alternatively some other part of the housing may take the role of brace, or the sensor could simply be held impinged by some pins or clamps that protrude from the housing around. Or a dozen other ways that all follow from the physical basis that no movement = no work = no energy use, all with respect to the reference frame (camera body) that the working parts are attached to. Whichever method they use is probably the same thing they do when the camera is switched off and battery removed; to avoid the sensor bonking around in there with no IBIS to keep it steady. It's not draining the battery when there is no battery.

Now, it is still possible that the IBIS system somehow manages to use energy. For example the actuators may be vibrating against each other at a high frequency, but too low amplitude to show up in images as softness. There can be some current leak, but that's almost never significant. The acceleration sensors and other subsystems may still be powered on and sipping power. Or the actuators could be doing exercise in there, working against each other in pairs while holding the sensor still.

- Mechanical Engineer.

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