I am using an i1d3 rev b retail version colorimeter.
With the sync mode on, my i1d3 can read very low light level until 0.002 nit, but when measuring 0% black, calman will say there is a read sync error and then force stopping all the measuring immediately, which makes it impossible to do an autocal with the sync mode on.
With the sync mode set to auto, my i1d3 cannot measure any level under 0.009 nit, it will only send back 0.333, 0.333, 0 in these levels.
And there is no way to change the sync mode when the autocal process is ongoing. I don't know but why not add a pause/resume function in autocal process? So that we can check or adjust some settings during autocal and don't need to start over when done; so that I can set the sync mode to auto at start and then change it to on when measuring near black levels.