M13, LRGB, Vixen 81s + Atik314E

A place to share images that you have taken with SharpCap.
Forum rules
Please upload large images to photo sharing sites (flickr, etc) rather than trying to upload them as forum attachments.

Please share the equipment used and if possible camera settings to help others.
Post Reply
User avatar
turfpit
Posts: 847
Joined: Mon Feb 13, 2017 8:13 pm
Location: UK
Contact:

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
M13-LRGB-Vixen81s-Atik314E.jpg (172.86 KiB) Viewed 345 times


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

SiriL-RGB-Compositing.PNG
SiriL-RGB-Compositing.PNG (33.56 KiB) Viewed 345 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

Dave

Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests