These are tough objects to image under our light polluted skies. The contrast of the Horse head against the sky background is low that it is almost at the threshold of bringing out any details. My 1st attempt on 16 Nov ended without much success with a total imaging time of about 1 hour. Once after subtracting the background glow, what was left of the final image had so little data that it hardly formed a decent image.
A second imaging session was done on 21 Nov,and with the additional data from the earlier attempt, I was just able to obtain a more favourable signal to noise ratio.Even with the total imaging time of slightly more than 2 hour, I am still stretching the final image quite a fair bit to enhance the colours & details.
A total of 80 subframes were capture with TV Genesis SDF, Canon 350 and LPR filter.
The Flame & Horse
The Flame & Horse
You do not have the required permissions to view the files attached to this post.
"The universe is composed mainly of hydrogen and ignorance." 
Great to know that even in Singapore, you can get great deep sky images.
Looking at the effort you have put in to get the image, I think you should seriously think of getting your hand on the items below.
1) A used Canon 300D and remove the internal filter. The original filter blocks off 80% at Ha wavelength. It will save you a lot of imaging time to get the same result you are getting now. A used 300D probably costs less than SGD800.
2) A narrowband H-a filter. A 10nm bandpass would be best for your current setup.
Just my 2 cents.
Hope to see more images from you soon.
Looking at the effort you have put in to get the image, I think you should seriously think of getting your hand on the items below.
1) A used Canon 300D and remove the internal filter. The original filter blocks off 80% at Ha wavelength. It will save you a lot of imaging time to get the same result you are getting now. A used 300D probably costs less than SGD800.
2) A narrowband H-a filter. A 10nm bandpass would be best for your current setup.
Just my 2 cents.
Hope to see more images from you soon.
-
wucheeyiun
- Posts: 1758
- Joined: Tue Sep 07, 2004 5:57 pm
- Location: marine parade
- Contact:
Hi weixing, the subframes were not evenly timed. I was using standard remote switch without timer. So I aga aga la. Most of the exposures ranged between 120s to 200s at ISO800. I experimented, and realised that exposure beyond 200s have diminishing returns. The skyglow is so bad that longer exposure will only clouded over the entire picture. I am still trying out the right mix between exposure and ISO.BY the way, what is the exposure time of a sub frame??
Hi Perside, thanks for the info.used Canon 300D and remove the internal filter. The original filter blocks off 80% at Ha wavelength. It will save you a lot of imaging time to get the same result you are getting now. A used 300D probably costs less than SGD800.
2) A narrowband H-a filter. A 10nm bandpass would be best for your current setup
