M13, LRGB, Vixen 81s + Atik314E

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M13, LRGB, Vixen 81s + Atik314E

Post by turfpit » Sat May 18, 2019 7:28 pm

Equipment: Vixen 81s, Celestron AVX mount, Atik 314E, Teleskop LRGB filters & filter tray. Unguided.
Software: SharpCap 3.2, Fits Liberator; SiriL, GIMP.
L: 60x60s bin 1x1, 100 bias, 60 darks, 60 flats.
RGB: 60x20s, bin 3x3, 100 bias, 60 darks, 60 flats.
See https://starizona.com/tutorial/color-imaging-3/ Binned-Color LRGB section. The bin 3x3 enables reduction of RGB exposures to 1/3 of the L exposure and maintain colour balance.

M13-LRGB-Vixen81s-Atik314E.jpg (172.86 KiB) Viewed 510 times

The image processing software Siril has an option for RGB Compositing.

SiriL-RGB-Compositing.PNG (33.56 KiB) Viewed 510 times

This was my first serious attempt at LRGB imaging. The information from the Starizona website seems to hold up. I think the effect of the filters will require longer exposures (and guiding) for best results.

I have some red fringing to the left hand side of some stars to the upper left, which will mean a reprocess of the data to find out what is happening and to learn how to use the RGB compositing tool. https://free-astro.org/siril_doc-en/#RGB_Compositing


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