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Thanks folks.
yes after much experimenting 15 minute subs with the UHCS filter at ISO 400 seems to be best. 20 min. subs seem to mean more dark noise and brighter sky backgrounds, combining to see no real gain in depth of final image. Shorter subs mean not enough depth. I guess in winter time and with a darker sky 20 min or even 1/2 hour subs could be the go.
Thankgoodness the southerly has come through now. Cooling off, now cooler I think than at 5 am thismorning!
Scott
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