Anonymous
Unregistered
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I had a chance to try out a new OIII filter last night on emission nebula M-8, the Lagoon Nebula. I have observed this object before and had to really use averted imagination to really see the lagoon since the nebula material was pretty difficult to make out. I was using a nexstar 8 with a 40 MM eyepiece (50X) and an OIII filter at a reasonably dark site. The view was amazing.  I could clearly see the nebula material in all three sections with the "lagoon" standing out dark and black against the white material of the nebula. The detail was simular to photographs I have seen of this object. I was feeling a little guilty about buying this new filter but I can not wait to try it on other objects. The gain in detail was truly amazing.
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Oldfield
Postmaster
Reged: 03/20/02
Posts: 5218
Loc: Hong Kong
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nice to hear that.
I've similar feeling with my Ultrablock filter before as well, but after I used it, I keep it and feel happy with it.
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The Home Astronomer from a city where most people are proud of the light pollution
Toys: C5, Ranger, Borg 45ED II, SM40/BF10, Unistar Light, TG-SP II, LXD55, ToUCam Pro, DMK 31AF03, Canon 10x30 IS, Pentax PCF III 10x50...
My observation log and ideas My General Blog
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Ron B[ee]
Tyro
Reged: 04/27/03
Posts: 4719
Loc: CA
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Indeed, to me both the UHC and 0-III are "magical" filters. Now all I need for this winter would be the H-Beta to ride the Horsey  .
Ron B[ee]
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5-inch Tele Vue NP127 APO 
4-inch Tele Vue TV-102 APO 
8-inch f/6 Discovery PDHQ Dob 
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matt
Vendor (Scopemania)
Reged: 07/28/03
Posts: 10022
Loc: Chaville, France
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I don't get it. I've observed the Lagoon for years, first with an 8" SCT and now with a 16 Dob. I must admit I barely see the nebula, even with an 0III or DeepSky filter. I feel "blinded" by the open cluster in the middle, and have never had spectacular or satisfying views of M8. Am I wrong, or does the nebulosity itself have a low surface brightness, hence my disappointment?
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Matt
CI700 mount with various scopes on top.
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Ron B[ee]
Tyro
Reged: 04/27/03
Posts: 4719
Loc: CA
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Wow  , that's so wierd. I viewed M8 just this weekend with filter and without filter and the "lagoon" dark lanes were clear seen with or without filter with my 8-inch Discovery Dob. The UHC and O-III gave a better view however  . This nebula is quite bright and not overwhelmed by the embedded open clusters at all! My backyard has a fairly dark sky. Is your sky badly polluted  ?
Ron B[ee]
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5-inch Tele Vue NP127 APO
4-inch Tele Vue TV-102 APO
8-inch f/6 Discovery PDHQ Dob
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Tom Trusock
Reged: 02/26/02
Posts: 27427
Loc: Alternate Reality (TM)
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I'd have to agree with Ron, I find M-8 very noticable without the filter even with low aperture. Heck some of the nicest views I've had of that region have been with 15x70 binos.
Do you have a significant amount of light pollution or are your skies hazy?
What lattitude do you observe from?
Tom T.
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There are two theories to arguing with my wife. Neither one works.
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Anonymous
Unregistered
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I've had no trouble in my 6" achro. It's very clear and the dust lanes show up quite noticably.
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Diego
super member
Reged: 07/29/03
Posts: 179
Loc: Argentina South America
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To add to what the others guys said, when I view M8, I see the central cluster and some of the nubulosity, but no dark lanes, no way...I've used a Plössel @ 23X and a wide field Erfle @ 56X and none of these reveled any more detail.
I still haven't been able to find the Trifid, and I probably won't with such small aperture.
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Diego
Celestron 80 mm f11.4
Oberwerk 20x90
6" f7.8 Reflector
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Ron B[ee]
Tyro
Reged: 04/27/03
Posts: 4719
Loc: CA
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80mm refractor with O-III  ? I'd say it's way too dark. Try a LP or UHC filter instead. But the dark lane may be illusive unless you have a good 4" refractor or larger scope.
Ron B[ee]
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5-inch Tele Vue NP127 APO
4-inch Tele Vue TV-102 APO
8-inch f/6 Discovery PDHQ Dob
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Gary BEAL
professor emeritus
Reged: 05/10/03
Posts: 583
Loc: New Zealand
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Hi all,
an OIII for sure, but it needs aperture as well. The nebulosity is very visible from my spot, and overhead as well. I tried a 5 minute trial with the MN66 and a Nikon with PPF400 colour print film the other night. Bouyed by the result I have tried deeper exposures, 15 minutes. Attached is the unguided 5 minute trial.
Gary
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Visit my homepage: http://www.totalwebsolutionz.co.nz/zeissnut/
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rboe
Numbfinger
Reged: 03/16/02
Posts: 39760
Loc: Phx, AZ
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Gary;
Very nice & pretty picture. One sweet shot. With film no less. I am very impressed. Even more so after having tried my hand at this. Like doing a crossword puzzle in ink! 
Ron
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Ron
NS11GPS
Pronto
16" dob
15X70 Obies
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Gary BEAL
professor emeritus
Reged: 05/10/03
Posts: 583
Loc: New Zealand
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Ron,
I was impressed as well, given all I was doing was trying the old F2 at the film plane. Guessed about 5 minutes, and hoped like heck. Once I saw it could be done I built up a guide scope, and have since done it again, as well as a few others, all with about 15 minutes exposure. Feels good to use film, even with the fun I have been having with the ToUcam. Will post the new ones if they come out OK.
Gary
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Visit my homepage: http://www.totalwebsolutionz.co.nz/zeissnut/
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