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Haven't had much chance to use these but my 5,7 and 9mm Burgess/TMB's arrived recently and I looked for the flaring issue that has been talked about. Using a 80mm short tube refractor the field was milky as the Moon was shifted out of the field of view in all 3 eyepieces. A similar effect was seen in my Vixen 8-24 zoom and a 10mm generic plossl, though the zoom was probably the best of all these with regard to flaring - I don't have a Pentax to compare these with :-(
Similar but maybe a little less flaring was seen in a Stellarvue f/9.4 refractor using the 7 and 9mm. Conditions were not good enough to use the 5mm.
Having said that, I don't find the flaring really bothersome and the Moon looked quite good in the Burgess eyepieces, unlike a 6mm expanse I once owned that showed terrible ghosting.
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