I have the 15mm version of the celestron widefield series.A 16 mm version did not exist. The widefield versions were apparently the predecessors of the Axiom series of celestron eyepieces. I find the 15 mm widefield ultima to yield a bright and contrasty image but with coma at the edges.
Celestron Ultimas
Started by Rod Kaufman, 12/08/2002 07:01PM
Posted 12/08/2002 07:01PM
Opening Post
Posted 12/08/2002 07:04PM
#1
"I find the 15 mm widefield ultima to yield a bright and contrasty image but with coma at the edges."
That would be astigmatism, not coma.
That would be astigmatism, not coma.
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