I've got the Baader Hyperion 13mm, would be interesting to compare with yours Steve. I suspect that it's exactly the same EP as the Stratus despite claims that the EP is different. In my LX 90 (2000mm f/l) eye placement is sensitive, in the wrong place and you get blackout and kidney beaning. I've found that with the rubber eyecup folded up the eye falls naturally to the correct position. My experience with the 13mm is the same as Rod's, excellent contrast, noticeably more detail than my 14mm S5000 Meade Plossl and sharp almost to the edges. Image scale seems larger than the 1mm difference in f/l would indicate as well on the Baader. It's difficult for me to make a subjective judgement as I have no access to Panoptics and Naglers which seem to be the benchmark, but I am quite impressed with the 13mm.
