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I believe you need something like a 2" 30mm, my 30mm is the EP I always start out with on my pushto dob and when you barlow it you have a 15mm equivalent. I believe Televue's eyepiece paper, that; s sent out with new EPs, suggests field stop selection. If you go by Al Nagler's advice there he suggests a field stop of 40mm which equates on their spec list to a 31 Nagler 5 or a 35 Panoptic. The 31 Nagler 5 will give you a wider field of view than the Panoptic.
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