he's right - i have bought one of the andrews binoviewers & it works great on hte moon . jupiter, but it does cut out a lot of light..
I don't think you eye would be able to switch between very well - why don't you look around for a good zoom eyepiece, wiliam optics, long perng (avail at andrews coms) , baader & vixen all make reasonable units i believe. also on ebay you can get cheap seben zooms - about $60 - ot sure of the quality but i think erick may have one - or at lest tested it
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