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Originally Posted by Sheap
frontier optics have a University optics 2.2X Klee barlow (the site only mentions a 2.8, but when i e-mailed them they also mentioned a 2.2). On claims for the 2.8X "simply put, there is no equal." Anyone know how this stacks up against others?
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It may be a very good barlow, but that claim you read on the website is of course just marketing hype from UO that you should ignore. (Televue and Meade make similar statements about their products on their websites.) From what I've read, the 2.8x klee has less clear aperture than many other 1.25" barlows, which means that it will vignette more easily (with long f.l. / large afov eps). But that won't affect its performance at high powers.
I haven't used one myself so I cannot comment on how good it is.