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try with the one eyepiece you have already. during the day is best, to pick up any darkening around the edges. amongst the lower cost units, the yet-to-be-released BV24 binoviewers from Burgess should be able to handle the FOV of the 22mm lvw. clear aperture = size of aperture (cross section) of the unobstructed light path through the binoviewer.
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