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A zoom eyepiece is very useful with nebula filters - it lets you quickly find the best magnification/exit pupil for your particular observing conditions. I find contrast is best in a limited range from in town. Last night using a 6" f/5 achromat I found an exit pupil of 2.4 to 3.2 was giving the best result on the carina nebula. (12mm - 16mm setting on a hyperion zoom).
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