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John,
I have the 5 and 8mm with the 28 and 14mm tuning rings. Very nice eyepieces. The 8 goes down to a 6mm with the 28mm ring and the 5 goes to 4mm and 3. something mm with both rings! Versatile in other words and the 20mm eyer relief is the best part. I use mine in a f8 6" refractor which has a 140mm focuser travel so I've not had any focus issues. Highly recommended as are the ES 82 degree series, actually I really like the ES eyepieces.
Matt
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