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As always, this is only my opinion and not everyone will agree, but I rate the Tak LE 5, for example, very highly. I have other 5mm premium grade eyepieces, such as Pentax XW5, TMB Supermonocentric 5, and others, but not a Radian 5mm (sorry). I rate the Tak LE5 above the Pentax XW5, which is more expensive, though the XW series are superb eyepieces and wider field. It would be marginally bettered by the Supermonocentric and Zeiss Abbe II, but these are far more expensive and have their drawbacks too with regard to comfort of viewing. The Tak LE 5 and 7.5 both have moderate eye relief and reasonable comfort, unlike many of the dedicated planetary types.
I would pick a Tak LE 5 over a Nagler any time (except for wide field viewing), but against a Radian???? Never done the comparison. This based on using many different scopes from 4" to 16", both refractors (not the 16" unfortunately) and reflectors.
my 2 cents, fwiw
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