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Old 15-09-2020, 03:36 PM
MarkInSpace (Mark)
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Iíve been wondering...

If I am doing narrow band imaging - is there any value in buying an APO? As long as I use very narrow narrow band filters and refocus between filters, does APO help me? If so, how?
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Old 15-09-2020, 03:43 PM
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DavidTrap (David)
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I contemplated the same thing when shooting LRGB with a doublet scope.

In my experience, you still get a bit of colour fringing.

Ultimately, an APO will usually be a higher quality scope, so there is an “overall” improvement in image quality.

DT
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Old 15-09-2020, 05:30 PM
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gregbradley
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APOs are usually corrected for other aberrations besides false colour.

Also higher quality APOs have a larger corrected circle so you can use large sensors.

Greg.
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