Re: Orion 4.5" opinions

From: SaberScorpX (saberscorpx_at_aol.com)
Date: 11/25/04 

Date: 25 Nov 2004 01:08:53 GMT

>>F4 will be much more difficult to collimate and will have much more coma.
>>an F4 light cone will also cause serious aberrations in
>>most eyepieces.

>The StarBlast does a remarkably good job
>And it features that spectacularly wide field.

More personal preference.
How much coma/abberation will one tolerate for a
substantial gain in field?
Kinda like 'how much clarity will one sacrifice for extra
magnification?'

Relevant Pages

  • Re: Orion 4.5" opinions
    ... >F4 will be much more difficult to collimate and will have much more coma. ... >steep angle of the an F4 light cone will also cause serious aberrations in ...
    (sci.astro.amateur)
  • Re: Achromats w/ Matched chromacors YES/NO/MAYBE?
    ... who was not able to collimate Chromacor with their ... like in short focus eyepieces. ... > fall and aberrations of an eyepiece itself will exceed aberrations of ...
    (sci.astro.amateur)
  • Re: pupil dilation & halos on bright lights
    ... >> Know what is the aberrations called. ... >> I know about spherical abberations, coma, astigmatism, turned ...
    (sci.med.vision)
  • Re: 1.25" TV plossl vs other 2"
    ... I'm not Mark, but I do have experience with two of the eyepieces you ... I only pop in the ST80 ... Because the extra-wide field shows up the coma inherent in a short ...
    (sci.astro.amateur)
  • Re: pupil dilation & halos on bright lights
    ... > Know what is the aberrations called. ... > I know about spherical abberations, coma, astigmatism, turned ...
    (sci.med.vision)