- Welcome to Orpington Astronomical Society.
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#1
Astrophotography / Re: M94
Last post by Carole - Yesterday at 16:54:46It is certainly experimental but gets you reasonable results of targets otherwise likely imossible with conventional LRGB.
Carole
Carole
#2
Astrophotography / M94
Last post by JohnH - Yesterday at 13:04:44M94 is known as The Cat's Eye Galaxy or The Crocodile's Eye Galaxy.
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
) 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
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
) 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
#3
Astrophotography / Re: IC4592 (the Blue horsehead...
Last post by Carole - Yesterday at 10:16:36I've replaced with this new version on Members Images.
#4
Astrophotography / Re: IC4592 (the Blue horsehead...
Last post by RobertM - Yesterday at 10:08:12Thanks all
I've added a touch more saturation to this version to bring out the brown dust a bit more:
Larger
4k
Full Monte
I've added a touch more saturation to this version to bring out the brown dust a bit more:
Larger
4k
Full Monte
#5
Astrophotography / Re: More from Petts Wood - Lat...
Last post by Rick - May 08, 2025, 14:45:59Quote from: Roberto on May 08, 2025, 05:55:15I don't know why it doesn't work in this forum anymore.The image included in the post is a .jpg (which doesn't support animation) but the main image of AstroBin is a .gif (which does).
#6
Astrophotography / Re: IC4592 (the Blue horsehead...
Last post by The Thing - May 08, 2025, 13:13:25Very nice Robert. At least you got a pic!
#7
Astrophotography / Re: More from Petts Wood - Lat...
Last post by Roberto - May 08, 2025, 05:55:15Thank you both. The sun quadrant is an animation. I don't know why it doesn't work in this forum anymore.
#8
Astrophotography / Re: More from Petts Wood - Lat...
Last post by Carole - May 07, 2025, 22:25:49Another fine set of images Roberto.
Jacoby 1 -
Total integration: 55h 50m
Sheesh!!!!!
Jacoby 1 -
Total integration: 55h 50m
Sheesh!!!!!
#9
Astrophotography / Re: More from Petts Wood - Lat...
Last post by Dave A - May 07, 2025, 15:07:23Lovely image captures again Roberto
The full image of the Sun is superb
The full image of the Sun is superb
#10
Astrophotography / Re: IC4592 (the Blue horsehead...
Last post by Dave A - May 07, 2025, 15:04:04Great image Robert
well done
well done