om-d sound even when IBIS off??

Started Apr 16, 2013 | Discussions thread
Ron Outdoors
Contributing MemberPosts: 567
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Re: om-d sound even when IBIS off??
In reply to hindesite, Apr 17, 2013

hindesite wrote:

Ron Outdoors wrote:


I had googled older posts. One of the big theories originally was fan noise.

Yes, that was my theory - the noise was from the cooling fan for the jpg engine. (It was a joke, BTW).

I don't see where the gyro theory was disproved. If it sounds like a gyro and acts like a gyro, I would suspect it's a gyro. Maybe someone will take the camera apart and prove otherwise.

Oh come on, you are not serious about there being a spinning gyro in the camera? Is this the same kind of gyro used in the iPhone, and just about every tablet and phone now available?

Spinning gyros are not practical for mass-market applications, these are often solid state (MEMS) vibrating pendulums, which operate far outside human hearing range, and some have no moving parts at all.

The noise is more likely to be produced by the drive motors for the sensor, than the gyros themselves.

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I didn't say they spun. Here is one common technology that does vibrate. As I said, the IS is clearly audible on many Canon lenses, and there are no "drive motors for sensors" to explain the sound.

Almost all reported micromachined gyroscopes use
vibrating mechanical elements (proof-mass) to
sense rotation. They have no rotating parts that
require bearings, and hence they can be easily
miniaturized and batch fabricated using micromachining techniques."

"Gyroscopes are employed in IS systems to sense pitch and yaw with low noise and high sensitivity in order to resolve the small movements associated with hand jitter. Typically, these systems require a full-scale range of +/-30 degrees per second, with at least 10-bit resolution.

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www.ronhartman.net

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