ICEINSPACE
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Moon Phase
CURRENT MOON
Waxing Gibbous 79.6%
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07-03-2005, 06:07 PM
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Registered User
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Join Date: Jan 2005
Location: Newcastle, NSW, Australia
Posts: 4,116
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Oxygen 3 filtered Eta Carina
Hi
I used my 6 inch Meade F6.3 Schmidt Newtonian "Cometracker" and EOS 300D. Two 5 min shots at ISO 1600 with Lumicon Oxygen 3 filter (also passes H Alpha light). Used Curves in Photoshop to neutralize excess red.
http://www.users.on.net/~josiah/temp/o3eta.jpg
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07-03-2005, 07:15 PM
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iceinspace
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Join Date: Sep 2004
Location: Melbourne
Posts: 1,665
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That is spectacular!
What's the yellow tinge in the bottom right hand corner?
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07-03-2005, 07:39 PM
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![[1ponders]'s Avatar](../vbiis/customavatars/avatar45_9.gif) |
Retired, damn no pension
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Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
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Now that's a great shot!!!  It looks almost 3D. Have you thought about cropping out the slight coma round the edge, particularly on the right above the "hot spot" (??? I'm assuming its amp heat. Its too localized to be skyglow. Unless of you have a light source in that direction  ) Terrific Tornado.
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07-03-2005, 07:52 PM
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Registered User
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Join Date: Oct 2004
Location: SE QLD
Posts: 381
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Great shot Tornado! Inspiring...cant wait to get my teeth into some DSO's...
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07-03-2005, 08:33 PM
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Sir Post a Lot!
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Join Date: Sep 2004
Location: Gosford, NSW, Australia
Posts: 36,799
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Fantastic, and also agree with Paul, cropping out the coma and amp glow it would look even better.
Come back more often!
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07-03-2005, 08:35 PM
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~Dust bunny breeder~
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Join Date: Nov 2004
Location: The town of campbells
Posts: 12,359
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*faints*
my god thats beautiful
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07-03-2005, 10:22 PM
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Cloud dodger
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Join Date: Dec 2004
Location: Hobart
Posts: 584
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Wow!
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07-03-2005, 11:07 PM
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1300 THESKY
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Join Date: Dec 2004
Location: Cairns Qld
Posts: 2,405
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Awesome 
How does it look visually with an 0III filter ?
I was spending some time looking at Eta Carina last night.
How much better with a 2" 0III filter ... 
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07-03-2005, 11:19 PM
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Who knows
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Join Date: Oct 2004
Location: Blackwood South Australia
Posts: 3,051
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This is a great shot, very impressive shot. Only criticism is that you need to up the contrast and drop the brightness out of the shot. Great stuff.
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08-03-2005, 11:11 AM
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Grey Nomad
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Join Date: Feb 2005
Location: "Where ever the wind blows".
Posts: 5,694
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Awsome shot tornado33
gaa_ian the wife has an Astronomiks OIII F/T it's worth it's weight in gold on some Nebulae as you can see by tornado33's shot.
Money well spent.
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08-03-2005, 02:52 PM
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Registered User
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Join Date: Jan 2005
Location: Newcastle, NSW, Australia
Posts: 4,116
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Thanks people
Yes that is Amp glow, that wasnt fully removed with flat fielding, as it was not a cold night and was a fair bit of dark noise and amp glow. Some more shots I took last night.
A shot of Eta Carina this time with a Lumicon Deep Sky filter, and better focus. http://www.users.on.net/~josiah/temp/etadeepsky.jpg
Also NGC 2467 http://www.users.on.net/~josiah/temp...67deepskys.jpg
Looking fowards to winter nights, less amp glow and thermal noise Normally I use either shorter exposures or lower ISO speeds, but the filter factor requires me to triple exposure times. The Cometracker 6 inch f3.6 Schmidt Newtonian was a very inexpensive scope when it was out, sold as tube assembly only. Sadly Meade discontinued them, though there is a 6 inch LXD model I believe, though sold as a complete scope and mount.
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08-03-2005, 03:12 PM
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Who knows
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Join Date: Oct 2004
Location: Blackwood South Australia
Posts: 3,051
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Very impressive latest shot. Very good work, must get one of those filters myself. Congratulations on a great shot.
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08-03-2005, 05:38 PM
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Registered User
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Join Date: Nov 2004
Location: Auckland, New Zealand
Posts: 1,079
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Very nice T33.. Have you tried doing dark frame subtraction. I find it works wonders on amp glow and general noise...
Basically I take 9 images at same ISO setting and exposure time with lens cap on. Then average the lot of them.
Subtract that from each raw image before stacking. I use photoshop to do everything, but the more dedicated astro imaging programs do it for you.
Cheers
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08-03-2005, 11:10 PM
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Retired, damn no pension
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Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
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That is a wicked second EC tornado.
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08-03-2005, 11:50 PM
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Sir Post a Lot!
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Join Date: Sep 2004
Location: Gosford, NSW, Australia
Posts: 36,799
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T33, can you please resize your images before posting them, or have a link to the images on your webspace, warning people how big they are. A couple of them are almost 200k and we still have quite a few dialup members.
The image guidelines are ~60k 800x600.
Thanks
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09-03-2005, 01:55 AM
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Cloud dodger
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Join Date: Dec 2004
Location: Hobart
Posts: 584
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I overlayed the images in Photoshop and aligned them so I could do a blink comparison between the two filters. The most obvious thing visible though was the improved focus of the second image, much sharper (and I'm not knocking the first one - I still think it's fabulous).
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11-03-2005, 12:07 AM
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Registered User
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Join Date: Jan 2005
Location: Newcastle, NSW, Australia
Posts: 4,116
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No worries, images now downsized.
Heres a deep shot taken without a filter, its a stack of four 200 second ISO 400 shots, stacked, dark subtracted and flatfielded with registax 3, and stretched with photoshop.
http://www.users.on.net/~josiah/temp...teredsmall.jpg
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12-03-2005, 08:43 PM
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<--- Comet Hale-Bopp
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Join Date: Jan 2005
Location: Cloudy Mackay
Posts: 6,542
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They're all good. I'm not sure which one I like best.
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