Can Fuji XT-4 IBIS correct stabilize wide lens without warped edges?

Started 3 months ago | Questions
ZOXEXIVO New Member • Posts: 2
Can Fuji XT-4 IBIS correct stabilize wide lens without warped edges?

I was unpleasantly upset when I saw how IBIS works with a wide angle.

Many people are waiting for the new firmware, but some of specialists said that it is impossible for Fuji, because it normal situation for wide angle lenses.

Really, I will can't use wide angle lens handheld while walking? 

My example with 14mm F2.8

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Fuji Maine Senior Member • Posts: 1,126
Re: Can Fuji XT-4 IBIS correct stabilize wide lens without warped edges?

It does it with the 16mm 1.4 as well. Not quite as bad as your video shows the 14 to behave but still pretty rough.

Truman Prevatt
Truman Prevatt Forum Pro • Posts: 11,862
Re: Can Fuji XT-4 IBIS correct stabilize wide lens without warped edges?
5

If you draw a picture it becomes clear as the geometry is pretty simple. The wider the angle of view the more the image perspective changes and as the sensor is moved this motion is modulated onto the image. That is particularly true on the edges when the motion is in the row, pitch or yaw direction.

This distortion is a function not only on the offset of the sensor from the rest portion but also the distance of objects from the sensor. That is not something a F/W "fix" can address.

IBIS has a sweet spot for operation. For long lenses OIS gives better performance since the sensor is limited in how much it can move. That is the change from camera movement is magnified along with the image. In super wide angle lenses (focal length of 16 or less), the angular movement of the sensor is modulated onto the image.

IBIS is going to perform best in the 23 through about 56 mm focal lengths (on APSC).

For walking with a wide angle - one word: gimbal which maintains the camera at rest and the sensor perpendicular to the lens axis.

The underlying optical principle at play here is known as the Scheimpflug principle.

https://en.wikipedia.org/wiki/Scheimpflug_principle

https://www.optowiki.info/?encyclopedia=scheimpflug-principle

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OP ZOXEXIVO New Member • Posts: 2
Re: Can Fuji XT-4 IBIS correct stabilize wide lens without warped edges?

With 16-80 OIS I don't see any wobbles on 16mm. What difference?

Truman Prevatt
Truman Prevatt Forum Pro • Posts: 11,862
Re: Can Fuji XT-4 IBIS correct stabilize wide lens without warped edges?
1

ZOXEXIVO wrote:

With 16-80 OIS I don't see any wobbles on 16mm. What difference?

In lens stabilization operates differently than IBIS. OIS does not change the sensor relationship with the camera axis. IBIS does. The warped edges result for the image plane.  While the OIS changes the focal plane.  With OIS any offsets in off camera axis  the depth of field will compensate.

The downside of OIS is changes the optical path through the lens elements which can result in some gnarly bokeh.  Combine the two and you get the best of and also worse of both worlds.

https://www.lensrentals.com/blog/2019/01/how-image-stabilization-works-in-camera-and-in-lens/

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