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I am the opposite to Phil above. I don't find eye placement critical in the 10mm or 7mm Pentax XW eyepieces, ( I own both), and I leave the eyecups all of the way in the down positions. I once owned a 6mm Delos and found it a bit more critical for eye placement than the XW's, so I set the eye cup on the Delos higher to avoid blackouts.
Cheers,
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