Thomas A Davis
professor emeritus
Reged: 03/25/05
Posts: 738
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I had limited time with this due to early moonrise. I
finally got a chance to take an image of NGC6888 with the
AP180EDT. I used the Lumicon Deep Sky filter (due to light
pollution issues from my home where I imaged this), and it
really needs some OIII data to round out the image. The
Deep Sky filter has a strong HA component, and with the
modded Canon XS, you lose too much nebulosity trying to
get any OIII or HBeta data to show. The OIII filter is
likely to help with this.
Anyhow, 6x10 minutes and 5x15 minutes at ISO1600 with a
modded Canon XS. I cropped down to try to keep some degree
of scale to the image here on the group. AP180EDT at F/6.9
Tom
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Nils_Lars
Post Laureate
Reged: 01/04/08
Posts: 3447
Loc: Santa Cruz Mountains , CA
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Wow you really went for a deep one , excellent shot.
This shot does need the OIII with the outer shell , I need to do that too.
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Erik
Orion Atlas Self Hypertuned (EQMOD)
Orion ED 80
Williams Optics VII reducer
Celestron 8" SCT
Orion Starshoot Autoguider
PHD guide
Canon 400D Hap Griffin Mod w/Baader filter
Astronomik clip-in LP filter and 12nm Ha
Stilleto CVF and Bahtinov mask
Tamron 75-300mm&28-80mm lenses
NexImage webcam
http://www.flickr.com/photos/31986095@N05/
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justabob
Carpal Tunnel
Reged: 05/05/07
Posts: 1684
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Nice one Tom. Most people do not get much of the inner part of the nebula without using a ha filter.
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http://www.pbase.com/rkn/astro&page=all
Vixen Sphinx SXW
Meade sn6
Canon EF 200mm f/2.8L II USM Lens
Hutech 1000d
Self modded 350d
ST8300c on order
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Bob
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nickatnight
Carpal Tunnel
Reged: 04/14/08
Posts: 1751
Loc: Santa Clarita, CA (LA Suburbs)
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That looks great Tom. It inspired me to read up on the AP180 EDT. Nice BIG scope. Don't think I'll be piggybacking on the CPC.  What monster of a mount are you using?
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nickatnight
Celestron CPC 9.25" GPS
Lumicon 2" LumiBrite Diagonal
Meade s5000 18mm UWA, Meade 6.7mm UWA,
Parks G.S-5 10mm, Celestrom 40mm Plossl
Parks 2x Barlow, Meade Tele-Extender
Celestron f6.3 Focal Reducer
Lumicon UHC Filter and Deep Sky Filter
Canon Rebel XTi (prime)
Canon Powershot G9 (afocal)
Canon EOS T-Ring and Parks T-Adapter
Lumicon Univ DigiCam Adapter
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waassaabee
Carpal Tunnel
Reged: 11/26/07
Posts: 2710
Loc: Central California Coast
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Very nice image, the detail is killer!
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Gary
34N 120W
-My kingdom for blue squares!-
WO Megrez 90FD/TV 0.8x FR/FF
AT8RC
mini Borg 50/Q-Guide/PHD
CGEM
Canon 350D Hap Griffin Baader mod - o.o
My Friend Flickr
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David Pavlich
Postmaster
Reged: 05/18/05
Posts: 8682
Loc: Mandeville, LA USA 30.22 X 90....
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Very nice image, Tom!
David
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Proud Member; PAS NOLA,
"If we knew what we were doing, it wouldn't be called research..."
A. Einstein
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Thomas A Davis
professor emeritus
Reged: 03/25/05
Posts: 738
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Quote:
This shot does need the OIII with the outer shell , I need to do that too.
The Deep Sky filter does pass the OIII and H-Beta lines
according to the transmission chart, but I saw very little
when I split it to RGB channels. The red channel (which is
entirely HA on this filter, was overpowering.
I have a 2" Lumicon OIII, so I'll give it a try. Worse
that can happen is that it does not work.
Thanks, Tom
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Thomas A Davis
professor emeritus
Reged: 03/25/05
Posts: 738
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Quote:
Most people do not get much of the inner part of the nebula without using a ha filter
That's why the Lumicon Deep Sky filter works with this. The
HA band is fully transmitted with a sharp cutoff on either
end of it. It does pass some H-Beta and OIII, but has a
strong HA component. Add to that the strong red response
on the modded cameras, and you get quite a bit of the
nebulosity. Unfortunately, I need to add some OIII data
to get a more natural color balance with it.
Tom
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Thomas A Davis
professor emeritus
Reged: 03/25/05
Posts: 738
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Quote:
What monster of a mount are you using?
It came to me on an AP900GT mount. Unless there are winds
to contend with, it handles the scope well.
Tom
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Thomas A Davis
professor emeritus
Reged: 03/25/05
Posts: 738
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Thanks Gary and David.
Tom
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