I have more to show from last night, just have not had time to convert them jpgs yet. One of the best nights I have had in months
Astro Video Image Gallery
Posted 25 July 2016 - 12:24 PM
Joe which skyglow filter did you use with the h-a filter?
I use the 2" Orion SkyGlow SC RC Broadband filter along with the 1.25" 7nm Orion Extra Narrowband HA Imaging filter on my C8. The SkyGlow filter came with my scope from the previous owner and is made in Japan. Not sure how old it is but the scope was made in the 80's.
Posted 25 July 2016 - 04:11 PM
Errol I am sure I have but can't find any examples in my picture folders. I don't keep very good notes if any at all. I have found 45 seconds for nebula's in Ha and 15 seconds for brighter objects like globs has been my sweet spot. I normally stack 4 to 5 frames. Occasionally I go to 60 seconds for the very faint objects.
Tonight I will try the Crescent in Ha stacking at 15 seconds and see how it compares. If you have a time you want me to use let me know and I will give it a try.
Here is the Crescent Nebula shot at 15 seconds and stacked 15 times. I get more detail in the 5 stack at 45 seconds from my earlier post.
Edited by TL2101, 25 July 2016 - 04:18 PM.
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Posted 25 July 2016 - 04:16 PM
Shot Pickering's Triangle from my 50mm Orion guide scope with a Ha filter using darks with the Lodestar X2. Cropped to eliminate stretched stars on the left side of the image.
Edited by TL2101, Yesterday, 01:05 AM.
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Posted 25 July 2016 - 05:19 PM
Joe, Thanks for doing the test stacking 15sec vs 45sec subs of the Crescent - definitely more detail and fainter stars visible in the 45sec subs. Very interesting.
Posted Yesterday, 08:39 AM
Here are a few more from Sunday night. Eagle, Trfid, Lagoon, Swan nebula. 15 second exposures stacked for 4 minutes
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Posted Yesterday, 08:50 AM
Okay, after seeing Joe's great H-alpha shots, I tried using the ASI224 with a 7nm H-alpha filter and the C8. I know that with the ASI224's RGGB color matrix at 656nm, the overall response will be about 35% of that of a mono sensor (ZWO gives relative responses at 656nm of: 95% for R, 19% for G, and 8% for B). So clearly this is not an efficient way to do H-alpha, but without a mono camera it's all I can do at the moment. Anyway, here is a 7 minute stack of 10sec subs of the Crescent. I didn't try longer subs, which might have been a good idea - I will try that next time.
NGC6888 (42x10s): ASI224 @350 gain + C8 @ f3.7 + 7nm H-alpha + SharpCap. Desaturated post SharpCap (too much red otherwise).
NGC6888_Stack_42x10s_350G_Ha_f3.7_GI_crp.jpg 95.19KB 4 downloads
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Posted Yesterday, 12:04 PM
Some shots from last night using my club's Atik Infinity color camera. Set it up in my observatory on the 8" SCT. Getting ready for an outreach event this weekend that I am hosting in my backyard.
All images on a C8 @ F3.7, CGEM mount and DGM GCE filter (no guiding). Exposure times are in the image name. Typically 5s-30s sub exposures.
There are some aberrations around the corners due to the fast focal ratio but for outreach I prioritize speed (as long as the image of the main object stays enjoyable no one notices)
M16 F3.7 5x30s GCE2.jpg 257.84KB 3 downloads
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Posted Yesterday, 12:10 PM
Details same as above
Looking towards M24 Sagittarius Star Cloud. My FoV is too narrow to get the whole cloud but captured the very interesting open cluster NGC6603 (center left)
M24 C8 f3.7 GCE 3x30s.jpg 325.37KB 2 downloads
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