Another question.. did this work for you before or is this the first time trying to calibrate at half resolution? if you request the full resolution, do you get the non-zoomed image? i know it will be slow to display in voxl-portal, but you could still check.
If you enable EIS with default camera calibration (no intrinsics cal file). does EIS and zoom work as expected? note that your version of voxl-portal may not have the browser support for zooming, but the config file zoom should still work. If you want to use the latest voxl-portal for EIS, please use this branch : https://gitlab.com/voxl-public/voxl-sdk/services/voxl-portal/-/tree/eis-integration . however the initial zoom of the image coming from the camera server is not dependent on the version of voxl-portal.
Alex