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Thank you everyone; the C.A. has just about entirely disappeared in the
subs I have now got at f3.5, so that is o.k. All I have now are the usual
colour halos from saturation.
Sorry to have wasted people's time. I do however, as I discussed with
another member in another thread, have almost perfect representations
of the lens' 5 leaf aperture diaphragm on the outer side of the brightest stars in my Orion image. The other member thinks it might be a reflection caused by the clear sensor cover, which is apparently very highly reflective. Has anyone else had this effect?
raymo
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