5-axis IBIS in a P&S

Started Aug 8, 2013 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: 5-axis IBIS in a P&S

tt321 wrote:

Anders W wrote:

tt321 wrote:

Anders W wrote:

ntsan wrote:

Panasonic and Canon also have "5-axis" IS too on their DC, but their one is combining Lens IS + Electronic IS, where else Olympus one is full mechanical 5 axis IS

As it sounds, the Casio does what Panasonic and Canon have already done: Ordinary lens-based IS combined with bursts of underexposed shots at high shutter speeds which are then merged and aligned via in-body processing. The latter technique is of course available to MFT users as well, on top of what regular IBIS/OIS can do. It's only that the body won't do it for us. We have to shoot a burst and then merge/align in PP by means of software like LR/Enfuse or PhotoAcute.

One might add that correction for at least one of the five axes, roll, is in all likelihood electronic only in these compacts. To my knowledge, lens-based IS can't correct for roll. Possibly, correction for vertical and horizontal shift is purely electronic is well. While it is not impossible to correct for that via lens-based IS, I know of only one lens that does it (Canon 100/2.8L IS USM Macro).

How does the E-M5/E-P5 roll correction work? Does it work differently for horizontally and vertically held shots?

It works the same way in horizontally and vertically held shots: By rotating the sensor around the optical axis. You can't rotate a lens and achieve the same effect. If you do, nothing happens to the image since the lens is radially symmetric.

The four other "axes" of the five-axis IBIS are accomplished by by only two sensor movements. Pitch requires the same up-down sensor movement as vertical shift and yaw the same left-right sensor movement as horizontal shift. So in this case, all you have to do in order to add vertical and horizontal shift to the two axes any IS system already has is a) add additional movement sensors and b) make sure the processing has information on focus distance since correction for vertical and horizontal shift requires that info.

By the way, what does this rotational compensation deal with any movements of the rotational axis? The camera holder is not obliged to rotate around the centre of the sensor, or even around a point within the sensor's boundaries. Is this axis position shift dealt with by the shifting parts of the IS?

Yes. Unless my geometric intuition fails me, the three kinds of movement of which the sensor is capable (up-down, left-right, and rotation about the optical axis) should jointly be able to cope with the scenario you describe.

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