I have a set of Baader Hyperion EP's and find them a very usable EP... Some time back JohnG and I did a comparison of similar sized and fielded Nagler EP's and found the Baader EP's to be very comparable to the TV Ep's. The TV's showed slightly more contrast with the background being a little darker but all up we both felt the Baader Ep's were a very ecconomical alternative with great eye relief and a confortable EP to use.
I haven't used them for astrophotography and couldn't reccomend them for this purpose but for visual they are pretty good.
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