Quote:
Originally Posted by Spookyer
Mark, appreciate you looking at this, I think I am in the ball park here. Agree the long NB may not always be practical. Just trying to get the theory correct.
Is the idea of going to the higher gain correct for NB targets? Is 150 about where I should be aiming?
If a target is quite high in NB signal should I be leaving the gain at 100?
cheers
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With the 1600MM the only advantage of higher gain is a slight reduction in read noise & shorter exposures. Unlike newer cameras there is no point where HCG mode kicks in to get back full well depth, dynamic range or a large drop in read noise. Maybe someone using a 1600MM can chip in here, but I see no real problem either way you go - the read noise reduction starts levelling out after 100 gain & the changes are insignificant compared to other factors. I use the same gain for both LRGB & NB, because of the camera I use, but I do know others that use 0 gain for LRGB & 120 gain (HGC) for narrowband with the same camera (294MM).
The 1600MM has a 'unity gain' of 139, so perhaps try that? I hope someone using a 1600MM does drop by as this is all based on calculations & real world results could be different.
Cheers,
Mark