Quote:
Originally Posted by mental4astro
Martin,
This looks like chromatic aberration to me - blue on one side, red on the other. Were you using a barlow with your Newts?
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True, but not caused by optical errors in your telescope, but our atmosphere, although when 29º high it wouldn't be that bad. Even the best Newton or Takahashi will show these errors.
Yesterday morning at 3:30 I viewed Saturn (only 15º high) and saw clear blue on bottom and red on top.
An hour later (when is was 30º high) it was almost over.
For low objects (if you cannot see them higher in the sky)
a dispersion corrector can be an option.