Quote:
Originally Posted by cometcatcher
I realise that a doublet will have "some" CA still, but my little Kson ED80 is a doublet at F5.5 also, like the Long Perng, and it's colour correction while not perfect is far better than the LP. That's why I went for the LP, I thought it would be in the same class as they are both F5.5. I believe the Kson uses a FPL51 glass element.
Kson ED80 pic for comparison.
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Hi Kevin,
For a given lens design/glass type, CA gets worse as you increase aperture.
Agree with the above suggestion to get one of the Skywatcher/Saxon ED80 scopes with FPL53 element. They are effectively colour-free and lots of people here are using them for photography.
Morton