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Hi Les, I have the Petersons eyeopener on my 12inch LX200 and have noticed that the only advantage is if you use wide field 2 inch eyepieces with a large field stop. My 41mm Panoptic and 26mm Nagler with the eyeopener show better views to the edge of field with no vignetting however the 17mm ethos shows no change in views over the standard visual back.
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