This might mean that you have 7 for low power, 7.3 for medium, and maybe 7.6 for high, and 7.6 would not be so bad really for planets.Again, one of the problems I had though is that if I went with a 20mm ES (no vignetting in low power) I would get too much magnification for most nights with the high power arm in, so I was forced to change to a 25mm pair anyway, which kind of defeated the purpo