Hi Profiler,
I can personally vouch for the quality of the Tak LE5 and I find that it has very good contrast and sharpness and very coulor neutral. The ER is 10mm and FOV of 52 deg. I have not compared it to a Variable Nagler so cant advise from that point of view.
However I would suggest if you need variable FL's then the Tak is not suitable no matter how good it compares, unless you want to buy multiple fixed FL eyepieces in the ranges you are looking at for the Nagler Zoom.
Cheers
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