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I have wondered about the 3mm setting, i.e. I'm never quite sure if the drop in image quality between 4mm and 3mm is due to the seeing or the eyepiece itself (or both). I also find with my TV 8-24mm zoom (not the same quality of optics, admittedly) it also seems to get a bit muddy at the 8mm setting. Maybe this is true of most zooms?
I think its greatest advantage is its tiny size and weight, compared to Radians, for example. But for extended viewing of the planets, particularly with an undriven scope, the extra field of view and eye relief from other eyepieces makes observing a whole lot more comfortable.
Morton
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