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Emission Line Filters & Deep Sky Observing

  • Telescope Reviews: Lumicon UHC filter - why 3 numbers on bottom?  (155k)  -  ..the views of emission nebulae. Oxygen III filters just transmit the two OIII lines, while an H-Beta filter only transmits.. ..let through. With emission nebulae (the objects the narrow-band, OIII-line and H-Beta line filters were designed for), they *only* emit.. ..emission in them with only weak emission lines, so narrow filters might tend to hurt them as.. ..the sets of emission lines that these filters pass. Clear skies to you. Post Extras: photiost.. - ndex12
    http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Board/te...

  • Telescope Reviews: Light pollution filter...  (91k)  -  ..pollution. Narrow-band and Line nebula filters are only for emission and planetary nebulae, so they should.. ..light pollution". On emission nebulae, narrow-band and line filters can offer the non-rural visual observer some.. ..that narrow-band and line filters *do* help emission and planetary nebulae even under light pollution. You.. ..that narrow-band and line filters *do* help emission and planetary nebulae even under light pollution." And.. - ndex11
    http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/4...

  • Imaging The Heavens - Narrow Band Imaging  (27k)  -  ..narrow band or emission line filters. All of the above apart from the weather are predominantly.. ..narrow band or emission line imaging. This relies on the use of very restrictive filters which only allow very specific wavelengths.. ..or light pollution filters, they are .. - ndex0
    http://www.imagingtheheavens.co.uk/page19.htm

  • Telescope Reviews: 4500 to spend on a CCD, filter wheel and filters  (185k)  -  ..filters? I know what Ha is, the hydrogen emission line, I just don't know what it.. ..just with RGB filters? I know what Ha is, the hydrogen emission line, I just.. - ndex17
    http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Board/cc...

  • narrowbandimaging : Narrowband Imaging  (35k)  -  ..with narrowband or emission line filters and is run by the person that pioneered the Narrowband.. ..emission line filters can help overcome the limitations of a bright sky allowing color images such.. ..just a single emission line filter such as Halpha. The discussion topics of the group include.. ..imaging with narrowband filters. Image postings.. - ndex0
    http://tech.groups.yahoo.com/group/narrowbandimaging/?tab=s

  • Telescope Reviews: Filters  (81k)  -  ..angstroms (sub-classes: OIII filters and H-Beta filters). Since both OIII emission lines have.. ..300 angstroms FWHM. Line "Nebula" filters : (passing only a single species of emission: ie:.. ..emission: ie: the Oxygen III doublet lines or the H-Beta line but not both species): bandwidths between.. ..common light pollution emission lines passing as much of the rest of the spectrum as possible):.. - ndex11
    http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/4...

  • New Forest Observatory » An introduction to narrowband Filters  (56k)  -  ..filters and line emission sources of light [as opposed to broadband emitters] For example from the.. ..there?  The main [line emission] filters used in narrowband imaging are: OIII – Doubly ionised Oxygen.. ..– Another Hydrogen line SII .. - ndex0
    http://www.newforestobservatory.com/2007/09/11/an-introduction-to-...

  • Telescope Reviews: Whats the difference?  (33k)  -  ..filter. These broadband filters are designed to "notch out" the common emission lines of Mercury and Sodium.. ..even narrower nebula filters known as "line" filters that let through only a specific emission line species like the OIII lines or the H-Beta.. ..a few narrow emission lines from nebulae like the Oxygen III lines (4959 and 5007 angstroms) and the.. ..bit different. Nebula filters are much narrower and are designed to only pass a few narrow.. - ndex14
    http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/4...

  • Telescope Reviews: Which OIII filter for 4 inch Apo?  (124k)  -  ..the Oxygen III emission lines with little attenuation, while some of the Baader filters hurt the 4959 angstrom line. The Tele .. ..the Oxygen III emission lines with little attenuation, while some of the Baader filters hurt the 4959 angstrom line. The Tele Vue simply is too.. - ndex11
    http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Board/te...

  • Telescope Reviews: Best Budget OIII/UHC Filters?  (124k)  -  ..less useful. For emission nebulae, the true narrowband and Oxygen III line filters need to be employed to gain.. ..filters clip one of the O-III emission lines. Nonetheless, they perform wonderfully in light polluted skies,.. ..emission line species. In my 10 inch f 5.6 Newtonian however, I am running 47x with.. ..47x with the filters, so then, I will definitely prefer the OIII filter over the NPB.. - ndex14
    http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Board/Ey...

  • Telescope Reviews: Why Do I Own a Baader Moon & Skyglow Filter?  (179k)  -  ..the narrow-band and line filters. In those cases, the transmission of the filters at the desired nebula emission line wavelengths usually exceeds.. ..light in the emission lines due to the insertion of these nebula interference filters is basically unnoticeable. The *stars*, of.. - ndex11
    http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Board/te...

  • Telescope Reviews: Best filters for big city light pollution  (77k)  -  ..that well. For emission nebulae however, narrow-band and line nebula filters can help boost the contrast, but.. ..In addition, on emission and planetary nebulae, the narrow-band and line filters do not significantly dim the nebular.. ..dim the nebular emission lines, as.. ..but *only* on emission nebulae (they don't work well on objects like.. - ndex16
    http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/5...

  • narrowbandimaging : Narrowband Imaging  (35k)  -  ..with narrowband or emission line filters and is run by the person that pioneered the Narrowband.. ..use of narrowband emission line filters can help overcome the limitations of a bright sky.. - ndex0
    http://groups.yahoo.com/group/narrowbandimaging/

  • Telescope Reviews: 3nm vs. 5nm vs. 7-8.5nm pros and cons?  (71k)  -  ..spectroscopic measurements on emission line filters for visual use. If you tilt the filter in respect.. ..very narrow Astrodon filters is not precisely on the emission line, but shifted toward the red by.. ..still covers the emission line. Here is a graph of a tilt series for one of.. ..one of these filters. Note that in an f.. - ndex5
    http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/4...

  • New Forest Observatory » An introduction to narrowband Filters  (56k)  -  ..there?  The main [line emission] filters used in narrowband imaging are: OIII – Doubly ionised Oxygen.. ..filters and line emission sources of light [as opposed to broadband emitters] For example from the.. ..– Another Hydrogen line SII .. - ndex0
    http://www.newforestobservatory.com/2007/09/11/an-introduction-to-...


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