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I am a relative newbie to this, the first ep I purchased was a zoom, 7-21 mm to go with an ETX90. Not sure this is the best way to go though as in my case I found the ep has a narrow useable viewing zone (that is your pupil must be in line with the centre of the ep to see anything at all at high magnification - not sure what the correct term is for this feature) this makes the ep hard to use for extended viewing vs fixed focal length eps.
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