|
The F Ratio * 2 and the 2mm exit pupil rule is a pretty good guideline to go for visual, as your main deep sky work-horse eyepiece.
In your scope that equals to a 10mm eyepiece and 125x magnification. This is a great magnification due to a number of reasons. First, its magnification is very useful on the lion-share of deep sky objects. Second, 125x will be usable on nights of even sub-average to bad atmospheric stability. 2mm of exit pupil is a great spot between object surface brightness and contrast of a darker sky back ground.
2 options with that concept. 10mm Ethos or Delos.
Now how deep is your wallet?
|