Aber das Stabi sitzt doch in der Optik, oder? Nicht im Body. Und die ist ja nun bei den beiden Kameras unterschiedlich.
Ich habe jetzt nochmal genauer recherchiert und Du hast recht!
Bei der XL kommt ein VAP System zum Einsatz (Vari-Angle Prism), welches mehr Platz benötigt und deshalb nur in der 20x Optik der XL eingesetzt wird, wobei diese Technik seit 1992 existiert. Das VAP System wird aber immer noch als die Flaggschifftechnik von Canon angesehen.
Die XH verwendet das neuere OIS (Optischer Super Range-Bildstabilisator (Lensshift-System)), welches es seit 1998 gibt. Das OIS ist kompakter gebaut und wird daher auch in den kleineren Serien von Canon verbaut: HV30, HG10, HR10, HF100, HF10.
Der augenscheinliche Unterschied fällt in der höchsten Brennweite auf: die XL scheint leicht zu schwimmen und dämpft stärker, steuert aber auch mehr gegen, selbst wenn man ruhig hält. Die XH verhält sich unauffälliger, dämpft aber weniger im Extrembereich.
How the VAP-IS Works
Under perfect shooting conditions, light rays from a scene pass through the lens optical system in a tightly prescribed manner. Any vibration or jolt to the lens-camera system will deflect those light rays and produce image unsteadiness. The VAP-IS technology is incorporated within the lens optical system to intercept such light ray perturbations and correct their deviations in real-time. The technology to do this is based upon a flexible optical bellows that entails two flat glass elements separated by a special liquid forming a sealed mini-optical grouping within the overall lens element groupings. The bellow expands and contracts when the lens is physically disturbed and the very high refractive index of the liquid bends the disturbed light rays in the opposite direction. This imparts a high degree of real-time correction to the angle of the light rays, ensuring they arrive at the image plane devoid of any unsteadiness.
Quelle
How the Optical Shift Image Stabilizer Works
The Optical Shift Image Stabilizer (IS) shifts a lens group in parallel to the image plane. When the lens moves, the light rays from the subject are bent relative to the optical axis, resulting in a blurred image because the light rays are deflected. By shifting the IS lens group on a plane perpendicular to the optical axis to counter the degree of image shake, the light rays reaching the image plane can be steadied.
Figure shows what happens when the there is a downward movement with the lens. The center of the image moves downward on the image plane. When the IS lens group shifts on the vertical plane, the light rays are refracted so that the image center returns to the center of the image plane. Since image shake occurs in both horizontal and vertical directions, the IS lens group can shift horizontally and vertically on a plane perpendicular to the optical axis to counteract the image shake.
Two shake-detecting sensors, one each for yaw and pitch, are used to detect lens movement. The shake-detecting sensors detect the angle and speed of movement and send this information to a high-speed 32-bit microcomputer. The microcomputer then converts the detection signals into drive signals for the IS lens group. In accordance with the drive signals, the IS lens group actuator moves the IS lens group and thus counteracting the image shake and maintaining a stable picture.
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Mit den neuen XF30x Modellen hat Canon auf ein überarbeitets OIS gesetzt, welches in 3 verschiedenen Modi arbeitet:
Standard: Lens shift is controlled so that the maximum compensation angle is constant from wide angle through telephoto.
Dynamic: Stabilization changes throughout the zoom range to minimize more pronounced shaking. This is especially useful at wide-angle focal lengths when walking.
Powered: Vibration is suppressed at the telephoto end of the range, where shake is most apparent due to high magnification.
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