I don't believe you understand what I am saying. The filter offsets are just simply relating how the focus distance of each filter compares to the other, NOT how far to move it when going from one filter to the next in any particular sequence. So your filter offsets could be 0 L, +20 R, +15 G and +25 B, or they could be -20 L, 0 R, -5 G, +5 B and it would have exactly the same effect. Also it doesn't matter what numbers you use, as long as the relative distance between the offsets remains the same. For your example, +1000 L, +1020 R, +1015 G, and +1025 B would work exactly the same as well. Ekos will calculate how far to move it between each filter based upon difference between the offsets. So it doesn't matter how you order them in your imaging sequence or even if you switch filters in a different operation. The offsets are global. If you set the filter offsets relative to each other, then any operation Ekos does, when it changes the filter for any reason, it takes the filter offsets into account and adjusts the focus by the difference between the two offsets of the filters it switches between.