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Not necessarily....you have a reasonable spread of EP's there but if you were going to get another EP, I'd look at acquiring something in the 15-20mm mark....then you'd have EP's with x46 (26mm), x80 (15mm), x120 (10mm) and x300 (4mm). Since your max magnification (under ideal conditions) is x480, I wouldn't look at getting anything smaller than the 4mm you already have. Too much trouble when the exit pupil gets so small. You should only use the 4mm when it's ideal seeing as anything will ruin your night more than using high power when it's not warranted or not really ideal to do so. You have an f/6 system (FL/Ap...i.e. Focal length divided by apeture), so your scope will be somewhat forgiving of poor seeing with a reasonably high powered EP in average conditions, but it's still fast enough to cause problems if you bump the mag up too far for the conditions you're in. You start to see things like tube currents, wind shivers, atmospheric turbulence etc, when you get too ambitious with the mag'.
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