Quote:
Originally Posted by TrevorW
Thanks Martin gain offset setting currently 139 50 took very short subs of m42 same night 10s. I noticed there was not much noise if those Lum subs  |
Trev,
NGC 2035 brightness magnitude of 10.99
M42 brightness magnitude of 4.0
Huge difference in signal ( brightness) and size of object between the two
Moons ( 25 to 30% ) up early as well on your Lum subs with NGC 2035
Lum takes a lot imaging time to nail optimum SNR with sub length , Gain and quality/quantity of data
Lum is similar to Oiii NB where the moons glare plays havoc with SNR. For NB imaging I try to time my Oiii subs with minimal Moon glare ( if practicality possible)
There’s no rule on which order or on which night you capture your data. Lum ( Broadband ) and Oiii ( Narrowband) are the only exception to that rule.
Cheers
Martin