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I have a set of the 25x eps that are normally suplied with the BT100s. These are of the Erfle type and not great. I can supply set of 2 for $50.
Plossls 20-25mm work very well, and i have used 7mm radians, Panoptics etc with brilliant results. My best alround eps for the price would be 17mm Orion Strtus, beautiful, with 2 degrees field of view and 38x mag, Kendall
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