Quote:
Originally Posted by FabrizioF
If an eyepiece has a superior optical correction with a very small number of optical surfaces like Clave' or Zeiss it means it transmits much more light then a five or eight elements eyepiece
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How much more light? Can you give us specific numbers measured in magnitudes... It shouldn't be hard to estimate and/or measure.
As far as optical correction goes... superior to
what exactly?
For example, which of the 5 Seidel aberrations does a Clave plossl correct better than an Ethos, Nagler or one of their derivatives?