I had a Seibert Ultra 15mm for a while, and found it to be one of the poorest backyard-job eyepieces I've ever used. It was brimming full with flares and reflections. Seriously, a $29 GSO is a better eyepiece. The build quality was also shocking.
TMB planetaries are ok for their price. They are average performers at an average price. I had a 5mm for a year or so and found it quite good. Not great, but quite good. I have a pair of the 6mm now, but haven't tried them.
I'll second the vote for a TV Radian, but will also throw in the idea of a University Wide Scan 10mm with a barlow. Anyone used a barlow on the Widescans?
Performance, eye relief, cheap price. Pick any two.
Cheers,
Jason.
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