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  • ====Coma==== ...if you have a short [[focal ratio]] Newtonian reflector (which has strong coma), you will notice it more easily in wide angle eyepieces than eyepieces wit
    8 KB (1,285 words) - 22:07, 17 May 2019
  • ...x the coma as an F/10 mirror. Even an F/4 mirror produces nearly twice the coma as an F/5 mirror.
    7 KB (1,162 words) - 17:38, 20 May 2019