Thanks Colin, I'll experiment with flats tonight after work. Might make an artificial (extreme) one first to see the effect in DSS. I made several under a cloudy sky the other day but clearly not suitable.
Honestly I don't mind the diffraction spikes but know what you mean. Yes I had a similar idea. Plenty of fast moderate FL newtonians around for very reasonable prices. I think I underspent on my tripod unfortunately as many will push me past the weight limit. Should have bought a NEQ6 for the added weight capacity!!
Tim
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