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Old 31-05-2017, 02:37 PM
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multiweb (Marc)
ze frogginator

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Join Date: Oct 2007
Location: Sydney
Posts: 22,080
Rho Area from SPSP 2017

This is the main shot I went for at the SPSP. Got 20h on it across 4 nights from Wednesday to Saturday night and a bunch of other filler shots waiting for Antares to get high enough around 10pm each night.

Taken with my old argon purged and electrical tape driven QHY8 OSC, an FSQ106N at prime focus (absolutely love this scope) on a G11. Guided with PHD on a lodestar/OAG and captured with Nebulosity 2.5. I did 80x900s. Seeing was ranging from excellent to very good across the week. 20kt jetstream up to 40kt on Saturday so very still on average. Transparency was ok but we got a lot wetter Friday and Saturday nights.

I used CCD Stack to calibrate, PI to bayer drizzle and do a final drizzle integration as I had enough subs to "plug the holes" left behind the debayering process. It worked remarkably well. My image scale is 3.02asp because of the short FL and the 7.8um pixels of my camera. Bayer drizzling gives me the equivalent of 1.5asp which gets rid of square stars. As I kept dithering during data acquisition. Although CPU intensive it helped a lot at integration time. Dithering also does wonders with data rejection and noise control.

I didn't do any sharpening or deconvolution as the data was good to start with. It might look a little soft and the stars a bit tiny but that's how it came out of the raw fits. Still a little noisy in the darker areas. I used Goodlook for the color balance.

I have various versions online that are too big to upload here.

Original 2xdrz file [6080x4032 - 16MB]
1:1 version [3040x2016 - 4.5MB]
cropped HD version [2353x1627 -2MB ]
Full field HD version [1920x1273 - 2MB]

Enjoy the views.
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Click for full-size image (RhoOph_sf.jpg)
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Last edited by multiweb; 31-05-2017 at 03:15 PM.
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