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Hi all

I have just got an Evostar 120 refractor and when I look at Jupiter is has a purple tinge around it, I was told this is CA and you can get filters to filter this out, anybody know the best filter to use for this.

Cheers..

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The filter will reduce the CA by around 40-50% but it won't rid you of it completely.

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You may find you can improve the image (ie reduce the apparent CA) simply by increasing the magnification.  Theoretically all wrong but it works!

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