Help!
May 5, 2019 07:56:56 #
I mentioned in another post that I am planning on use a reflector, SCT to do some deep space galaxy imaging along with planetary - lunar stuff over the remaining spring and summer.
I do not know what I am doing with the SCT and deep space galaxy capturing and post processing....mostly the later. The SCT is an 8 inch EdgeHD with an Edge .70 reducer. I have collected two nights of M51......8 hours of LRGB (I opted to leave Ha out) using 120 second exposures for all 4 filters. I am using an ASI1600MM-C pro camera and Astronomik filters (I know this combination is capable of producing some decent images as I have seen those on Astrobin). While I was imaging M51 I was using the other OTA to image the Hercules Cluster, M13. Those are 15 second exposures about 100 each filter and I also used an identical camera and filters on a Widefield refractor, Stellarvue 70T with a .80 reducer.
Both images were processed in PixInsight - nothing else. Hercules is sharp and detailed - Whirlpool is flat, stars are bloated and have halos and galaxy is without detail. I suppose the only thing that is ok is the color.
I am seriously ready to take the SCT off and put the AT65EDQ back on and do nothing but widefield on both OTA's.
Frustrating! ...and suggestions using PixInsight and settings are appreciated. You will not hurt my feelings I really want to get this Edge working for me!
I do not know what I am doing with the SCT and deep space galaxy capturing and post processing....mostly the later. The SCT is an 8 inch EdgeHD with an Edge .70 reducer. I have collected two nights of M51......8 hours of LRGB (I opted to leave Ha out) using 120 second exposures for all 4 filters. I am using an ASI1600MM-C pro camera and Astronomik filters (I know this combination is capable of producing some decent images as I have seen those on Astrobin). While I was imaging M51 I was using the other OTA to image the Hercules Cluster, M13. Those are 15 second exposures about 100 each filter and I also used an identical camera and filters on a Widefield refractor, Stellarvue 70T with a .80 reducer.
Both images were processed in PixInsight - nothing else. Hercules is sharp and detailed - Whirlpool is flat, stars are bloated and have halos and galaxy is without detail. I suppose the only thing that is ok is the color.
I am seriously ready to take the SCT off and put the AT65EDQ back on and do nothing but widefield on both OTA's.
Frustrating! ...and suggestions using PixInsight and settings are appreciated. You will not hurt my feelings I really want to get this Edge working for me!
May 6, 2019 05:45:08 #
May 6, 2019 14:50:24 #
nikonshooter wrote:
I mentioned in another post that I am planning on ... (show quote)
In looking at the galaxy shot, it just doesn't seem to have a good focus, and looking real close, it is looking like possibly the green filter shot is worse in that the stars in that color seem larger than the stars using the red and blue filters. It also seems like the stacking is consistently stacking the green color lower than the other colors and this seems consistent all corners.
On the other hand, you nailed it on M13 and it is very nice and sharp.
May 7, 2019 07:33:03 #
i agree the focus on the galaxy looks a tad on the near side of perfect focus
M13 is super sharp
M13 is super sharp
May 8, 2019 02:29:01 #
I hate to ask you this question, but do you take flats for each filter? I only ask because I see some odd smudges in diff color. The next question would be how well collimated is the SCT. Sorry, not much help.
May 8, 2019 10:43:16 #
I've realign the planes of my color channels , my images were worse than these . I realign the color channels manually , I don't know if Pi has that tool Ed.
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