This is my largest project to date.... 11+ hours on the Sadr Region in Cygnus. This is also my first time using a filter (quadband narrow band). I got lucky to have 4 clear nights in a row to try out this filter.
I had been thinking of going narrowband and for a while now but was afraid of diving into it. But being to image from my Bortle 7 backyard with the moon out instead of waiting the new moon and driving 1h30 to my Bortle 2 site is great. I was afraid that 3min subs would not be enough with such an aggressive filter but that worked out well. Finding targets with such a strong filter and without a Goto mount or plate-solving is definitively challenging.... Doing it 4 nights in a row while trying to manually frame the target the same way is VERY challenging.
I did not guide. I just used a simple star tracker without autoguiding. I've just bought my first autoguiding system but still waiting for the guide cam and guide scope.
What do you all think?
Target: Sadr region
Dates: 2021-07-28; 2021-07-29; 2021-07-30; 2021-07-31
Location: San Antonio, TX (Bortle class 7)
Mount: IOptron SkyGuider Pro
Camera: Nikon D5300 astromod
Scope: William Optics Zenithstar 61II + Field Flattener FLAT61A
Focal/Aperture: 360 mm @ f/5.9
Filter: Radian Telescopes 2" Triad Ultra Quad-Band Narrowband Filter (H-beta:5nm, OIII:4nm, H-alpha:4nm, SII:4nm)
Lights: 225x180s (total exposure: 11h15)
Calibration frames: 4x30xdarks, 4x30xflats, 4x30xbiases
Stacked in DDS and Processed in GIMP, Denoise AI:
1- Histogram stretching / Levels adjustments
2- White balance adjustment & RGB channel alignment
3- Curve adjustments on starless image (obtained using starnet++)
4- HighPass filter
5- Slight noise reduction (DeNoise AI)
Edited by Nicolarge, 02 August 2021 - 10:10 PM.