☉ Can DCC Filter be used with a zoom lens?

Yes. Please cover the front lens with DCC Filter after you zoom in zoom out and decide the scene at the last step to set up the manual white balance to finish the setting. There is no need to cover the whole lens with DCC Filter.

Due to the different visual angel from telescope to wide angle, the screen of CCD/CMOS is filled with various contents of the scenery.  It is a must to do another manual white balance action for the right color calibration as soon as the lens visual angel is changed.