Last nights shoot

[Striker]

Had a clear night to do the Bottom half of the Chicken nebula in narrowband.
4 minute exposure's total 4 hours exposure

I also had to have a go at Centaurus A Galaxy doing some LRGB from Brisbane.

I could only take 20 second exposures but am stoked with such short exposures in LRGB. total exposure time only 1 hour.
The Galaxy shot is severe crop as I am shooting with 1600mm-c on Esprit 120.

May look at getting a light polution filters to get longer exposures.

[lazjen]

Those look pretty good - I might have to try Centaurus A myself I think. What Gain/Offset are you using?

If you haven't seen it, you might like to read Ray's thread: http://www.iceinspace.com.au/forum/showthread.php?t=155908 on exposure times for the ASI1600. It might not be necessary to try for longer exposures, but perhaps more of them?

[Striker]

Thanks Chris, that's some interesting reading.
Looks like I am at my limit on exposure length in the red zone and can go shorter. Narrowband surprises me, 5.5 mins seemed too long for me specially in OIII, I tend to go for around Median 850ADU in SGP which is 4 mins subs in HA and SII but 3 mins on OIII.

I have only shot on Unity so far.....all this is very new to me.

[Atmos]

Just remember that the values you get in SGP contain the bias level whereas Ray's ADU values do not as they assume a calibrated image.

[Striker]

Ok cheers...thought they seemed a bit off but I am far to new to question.

[LostInSp_ce]

These look awesome Tony