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Old 15-05-2008, 05:07 AM
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iceman (Mike)
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iceman is offline
Join Date: Sep 2004
Location: Gosford, NSW, Australia
Posts: 36,734
Wow Arp, that is really, really good!
What scope did you use? Exposure times?

The powermate is the best of the barlows, but it still can require a slightly different focal point in each colour channel. It's not necessarily the powermate that causes it though - it's more likely the atmospheric dispertion. I've found it also depends on the seeing and the altitude.
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