[seszett]

It also does track the revolution of the Earth around the Sun, and that of the Sun around the Milky Way, as well as the various influences over the Milky Way that make it go less than straight on its way towards the Great Attractor.

Those movements just happen to be slow enough that they don't limit image stabilization to 6.3 stops.

[thrdbndndn]

I still don't quite get it.

Under what definition the Earth's revolution is "slower" than its rotation?

Why can the camera's stabilization system detect the rotation and correct it (and causes undesirable result) but not the revolution?

[_ph_]

The relevant "speed" is the change of the direction you are pointing at. The Earth rotates around itself in 24 hours, but around the Sun in 365 days, so the daily rotation is 365x as fast. We also rotate around the center of the Milky Way every couple of hundreds of millions of years.

[thrdbndndn]

Ah, so the angle (orientation?) is what actually matters? It makes sense now.

Thanks!

[_ph_]

At least with respect to the influence of the Earths rotation. With respect to compensating actual camera shake, the modern systems correct 5 axis's. 3 for rotation around the 3 space axis's, and 2 translational, which leaves only motion towards or away from the motive uncorrected for (which usually only expresses itself in the need of refocussing, but that usually is far beyond camera shake, except for macro photography).