I have a partially eclipsed Moon rising in 80 minutes. I'd like to do either a timelapse, ie a shot every 5 seconds or so, or a series of stacked images, maybe one every 20 minutes or something.

For the time lapse, how would I effectively adjust my exposure times so that the changing exposures would not cause sudden changes in brightness for the resulting time lapse video? I have downloaded the Lunar Eclipse Exposure Guide and have picked out a ISO400, f/6 series of exposures (regarding the chart, I am going to split the difference in exposure time between f/5 and f/8).

• Are there any websites where I can find a rough timeline of when the Moon is going to be certain magnitudes during the eclipse? The magnitudes represented on that chart seem to reflect how much of the Moon is covered in shadow. Maximum eclipse for tonight, for example, would be 0.90-0.95 if I am understanding it correctly.

• The problem is I can only estimate this visually. Does the Moon follow a linear progression of these magnitudes, ie progressing 10% in or out of shadow every X minutes? Or is it more like a bell curve in changing brightness? I am looking for something that can tell me "step down your exposure by ____ much every ____ minutes," or at least a way to calculate it. I know precisely how long the eclipse lasts, but I don't know any kind of interval as far as when it enters certain percentages of shadow.

Any prompt help would be greatly appreciated! Worst case I can just wing it