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IBIS not working with new Samyang AF 12mm?

Started Jan 14, 2022 | Discussions thread
OP Noracsa New Member • Posts: 13
Re: A bit off-topic: IBIS capabilities, relative and absolute (?)

Rightsaidfred wrote:

lewiedude2 wrote:

What Truman said, but before doing so, I’d love to see some 1/2 and 1 second images that are tack sharp. It would enlighten me to the IBIS capabilities of the X-S10.

Is it really as simple that IBIS does prolong by x f-stops (relative gain), or is there also an 'absolute' limit?

A shaky person will need a shorter ss w/o stabilization as well as with stabilization activated. But is it really a parallel shift in the gain of stabilization? Is a gain of 4 stops starting from 1/500 s ending up at 1/30 s technically the same challenge for the IBIS as a gain of 4 stops starting from 1/60 s ending up at 1/2 s?

I think that it's a parallel shift for a wide range of shutter speeds, but with a limit that's determined by the steadiness of the hand an the (slow) shutter speeds.

My reasoning for there being a limit goes like this:

IBIS has to compensate for any movement of the camera body by moving the sensor, so that the sensor stays at a fix point in space.

The range of motion of the IBIS within the body is limited to only some milimeters.

Whenever the camera body is moved farther than IBIS can counter move, IBIS will fail.

This limitation is no problem for fast shutter speeds. But with very slow shutter speeds, the amount of camera movement can exceed the working range of the IBIS, which leads to IBIS failing.

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