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knobby

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Posts posted by knobby

  1. Thanks gents, interesting replies, I've been stubborn in sticking with 300 sec / 139 gain ... might have a dabble ( and new darks library 🙂 ) going down to 180 seconds as @Blazar has done the maths from Robin Glovers video which implies 170 ish is optimal for my situation.

    Probably get less subs lost by wind  / satellites etc 

    • Like 1
  2. Hi all, I'm sure I've read this before somewhere but still unsure of the theory ...

     

    Am I correct in thinking that when stacking, 1 to 2 Half's the noise, then 2 to 4 Half's again, then 4 to 8 ... 8 to 16 etc.

     

    So going past 16 really needs a massive investment in time ?

     

    Also where does sub length come into this ? I use a ZWO 1600 pro and seem to get good results in my bortle 7 / 8 zone with 300 seconds at unity gain.

     

    Also, now sure that (as I've been told but wanted to see for myself 😉) that only Ha cuts through the Moon glow.

     

    Due to time restraints I've been aiming for an hour per filter but this equates to 12 subs so I guess I need to grab an extra 4 to see the benefit ?

     

    For completeness and a recap ...

     

    300 seconds / gain 139 / ZWO 1600 pro / f4.9 ZWO narrowband filters.

  3. Definitely the thought that counts 👍

    We did this last year for a friend we lost to Covids partner. 

    We did carefully research it and chose a random star near Cassiopeia ... that way they can look up most of the year and see roughly where it is.

    They were happy so money well spent. 

    • Like 2
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