Gast_480297
Guest
Aber bei 300mm scheint der IBIS wohl tatsächlich an seine physikalischen Grenzen zu stoßen, was die Kompensation der Handbewegungen betrifft. Da habe ich wohl zu viel vom Gyro-Sensor des neuen IBIS erwartet.
Gruß
Dirk
In ihrem nun kompletten G80/81 Review gehen die Autoren auch auf den IBIS/Dual-IS ein.
http://www.imaging-resource.com/PRODS/panasonic-g85/panasonic-g85A.HTM
Panasonic G85 introduces Dual I.S. 2 with up to 5-stops of stabilization
...This new stabilization system is said to provide up to 5-stops of correction all the way out to an equivalent focal length of about 280mm.
Going to longer focal lengths, you run into issues with the amount of compensation for which the sensor shift mechanism can account. For example, at 14mm a 0.5 degree of angular blur only accounts for 0.94% of the frame (or about a 1.3mm shift). However, when you increase the focal length into supertelephoto territory, say 300mm (600mm eq.), the same 1.5-degree angular blur accounts for a whopping 20% of the frame. In other words, the amount of shake and the effect of angular tilting of the camera and lens become magnified the longer the focal length grows. The longer the focal length, the more correction the sensor and lens stabilization systems need to correct for, and the sensor can only move so much (approximate 1mm). Plus, the image circle for the lenses would need to be larger to compensate more if the sensor was designed to shift around to a higher degree. For optical stabilization, the compensation angle is almost the same from wide angle to telephoto, at about 0.5 degrees. Body-based stabilization shifts the sensor very little at wide angle to about a maximum of 1mm at 100mm. In the end, the Dual I.S. 2 system coordinates the amount of shifting and correction between the optical I.S. system and sensor-shift system to produce the optimal amount of stabilization correction.
Möglicherweise eine ergänzende Erklärung für User mit Altglas im Telebereich.