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NGC 891 from last night
Posted: 13 Jan 2023, 16:45
by Dunmunro
NGC891 with an Orion SSpro APSC OSC (6MP, 7.8 micron pixels) camera through a 10in F6.3 OTA on a CEM60 using a Starizona .75x SCT reducer for F5 (~1250mm); 14 x 15min subs. I used a 2X drizzle stack, 15 iterations of LR deconvolution and a DDP pass. Acquired, OA guided, temp based focused, preprocessed and processed with Astroart 8 SP3. 5 DFs but no flats; the adaptive gradient removal worked very well.
Re: NGC 891 from last night - 2nd mount and camera
Posted: 13 Jan 2023, 21:37
by Dunmunro
This image stack was taken at the same time as the first image.
Another NGC 891 with an Orion SSpro APSC OSC (6mp 7.8m pixels) CCD camera through a 10in F10 OTA ,on a CEM120, using a Starizona .63x SCT reducer for F7 (~1750mm); guided off axis. I used a 2X drizzle stack, 20 x LR deconvolution and DDP with an adaptive gradient removal to remove some moon glow. Acquired, guided, temp based focused, preprocessed and processed with Astroart 8 SP3. 10 x 1200sec subs = 3.33 hrs. 2nd image is a close up of the image centre.
My ancient SSPro cameras perform best with long subs. Drizzle stacking also acts to supress background grain by smoothing out the pixel structure. ( I used 64bit AA8 SP3 for image acquisition)
