M94 is known as The Cat's Eye Galaxy or The Crocodile's Eye Galaxy.
(https://i.imgur.com/FQI5gvl.png)
FOV - 28' x 28' (Cropped from approximately 160' x 100')
Total imaging time 13 hours 27 minutes.
Processing: Pixinsight, GraXpert and Affinity Photo 2
This time I varied my processing slightly, Luminance is *just* Dual Band (Ha Oiii) - 5 hours 20 minutes.
Chrominance:
R - 1 hour 28 minutes
G - 1 hour 28.5 minutes
B - 1 hour 30 minutes
Ha - 3 hours 40 minutes
(Any disparity in totals due to rejected subframes)
Telescope - Sharpstar 15028 HNT
Camera - ZWO ASI1600MM Pro (monochrome -cooled to -10C)
Mount - iOptron CEM25P
Assorted ZWO gubbins - Electronic Focus, Filterwheel, Guide camera and telescope and ASIAir Pro.
Location: Bromley (Bortle 7)
I posted this image with an explanation of why I use a Dual Band filter for Luminance and how I use it on Astrobin. The general consensus from experts (Carole dissenting :D ) seems to be that I am totally wrong and that I will miss too much detail and too much of the spectrum and that I should use very short UV/IR filter images and remove the gradient from each one before integrating. For the moment I am happy to continue with what I am doing. As far as I am concerned it is a hybrid Broadband/Narrowband image (akin to using a Dual Band filter with an OSC camera) and goes a long way to defeating light pollution.
One thing I could, I suppose, is to create a "pseudo Luminance" from RGB and use that to create the star layer. That could give me better star colour.
I look forward to trying it out on nice big nebulae when the nights begin to get darker.
Regards,
John
It is certainly experimental but gets you reasonable results of targets otherwise likely imossible with conventional LRGB.
Carole