Hi, I recently got the Daystar Quark chromosphere filter, and I ponder the eternal question: How do I know I am properly on-band? I do not see too much difference when turning the knob from right to left via the mid position. Perhaps I am just incapable of judging which is the best knob position to be on-band. Hence, I gamble and shoot when I think I have the best contrast. How do you guys do this properly?