Quote:
Originally Posted by Dave882
Hi Martin, great to see your results from our run of good weather. I certainly wouldn't be upset with that result. - with some very nice detail revealed from your heavy LP location, especially in the brighter core. I agree, with 21hrs I would hope to see some more of the outer extents, but it's very very hard when the noise floor is so high. I'd love to see what the Ha b/w image looked like - perhaps that would show more faint detail without the noise from the Sii / Oiii affecting the signal?
On a side note - the jet stream has been running wild the last couple of weeks and that has really affected the seeing and stability.even at shorter fl.
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Thanks Dave,
Yeh really faint objects at my focal length and aperture under 88 skies is hard work but we do our best.
I imaged the Dolphin a while back with 5min subs ( around 8 to 10 hrs of data ) and it too was a struggle when trying to stretch and expose more detail. The noise gradient just hits you and puts the brakes on the stretch.
I might just process the Ha alone on the Helix and see how much I can pull out before it gets grainy.
I reckon 35 to 40 hours on these dim faint targets in Narrowband under B8 skies is about the limit where anything beyond that is diminishing returns. The trouble is we just don’t get a window of opportunity during new moon to gather that amount of data and generally after a few months the target moves out of range as well. We do what we can.
Cheers
Martin