Quote:
Originally Posted by Lester
I have enjoyed reading this thread. Not meaning to hijack the thread; if a barlow is used with the 82 or 100 degree FOV eyepieces do you still get the same FOV, or is it reduced?
Thanks.
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Apparent Field of View (AFOV) is the same although some very short Barlows can cause vignetting with some eyepieces. It's usually the fault of the Barlow not the eyepiece.
True field of View (TFOV) is reduced by the amplification factor of the Barlow or Powermate. ie. 2x = half TFOV.
A Powermate re-create the light cone exactly as the eyepiece was designed to see it. Eye relief is maintaned too.