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this is really getting closer to the nub of the question I am curious about in terms of a side-by-side comparison in optical performance amongst a 5mm LE versus a 5mm Radian or 5mm Nagler - which would provide the better view (putting aside AFOV, eyerelief issues etc) of a planet (as an example)?
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Horses for courses - Naglers are highly corrected ultra wide-angles. That means they will be sub-optimum for a specialised application such as planetary observing, where that "spacewalk" view is unnecessary.
In planetary applications (Mars, Saturn, Jupiter), I notice that my 13mm Nagler Type VI falls down in two areas primarily - contrast and light scatter. My 10mm Radian has a considerably narrower field of view, but offers better contrast and less light scatter - it's in its element with planets, just as it was intended to be by its designer.
I used to have a 7.5mm Tak LE and rather regret selling it - eye relief wasn't great but for clarity and contrast on planets, I haven't tried anything that beats it. Cloudy Nights has some interesting and detailed planetary observing eyepiece comparisons:
5mm Planetary Eyepiece Shoot-out
6mm Lunar/Planetary Eyepiece Comparison
DETAILED COMPARISONS OF 7MM EYEPIECES
There's probably others there too, if you go looking.