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Thread: Nebular filters for visual observations: some useful links and infos

  1. #21
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    Default Re: Nebular filters for visual observations: some useful links and infos



    Hello all,

    here are some more links, as emerging in the course of time:

    An important update: The blackskynet has published precision spectra of the filters taken through the Perkin Elmer Lambda900 spektrometer with the 1nm resolution, bandpassfilter . These spectra replace the spectra at lower resolution, or spectra taken on older filter batches (ARO spectra), as manufactured in the past.

    Sven Wienstein has posted on the web results on the transmission of the light pollution through the nebular filters, Nebelfilter visuell The results have been published before in the Interstellarum.

    More opinions on the quality and applicability of the nebular filters are here, Astronomik or Lumicon OIII filter - Discussions - Eyepieces - Stargazers Lounge

    Happy reading under the clouds, or under the Moonlight,

    JG
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  3. #22
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    Default Re: Nebular filters for visual observations: some useful links and infos

    Re: 2nd hand nebular filters

    Hello all,

    here is an important lesson learned with an OIII nebular filter obtained on the 2nd hand market: thousand oaks oiii filter ?

    Hoping to have helped you,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS; Astrophotography: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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    Default Re: Nebular filters for visual observations: some useful links and infos

    Hi Everyone, J.G. has been helping me out when it comes to filters. One of his suggestions was contacting Astronomik concerning a trio of filters. Here is what the response to my inquiry was: "The Astronomik UHC is our 'jack of all trades' filter for Nebulae. The same task for all stellar objects is achieved by the CLS filter. The CLS filter 'only' keeps away emissions of sodium- and hydrogen vapour street lamps without influencing the white balance of the camera.

    All filters marked with 'CCD' have an additional blocker for UV and IR. A colour neutral filter is the Astronomik L(uminance). This filter has an defined UV and IR blocker and is necessary for IR and UV sensitive cameras in combination with refracting optical elements. With pure mirror optics this filter is needless."

    I hope this is useful.

    Caley
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    Default Re: Nebular filters for visual observations: some useful links and infos

    Hi All, I got a chance to try out my new acquisition, an Astronomik UHC 2" Filter. Here is what I wrote about it on another thread: "The last object I viewed was simply to try out my new Astronomik UHC 2" filter. I placed it just before the diagonal, and used my lowest power, a 21mm Orion Stratus eyepiece. The object was NGC6992, and the results were totally stunning. I could see the object without a filter, and it was quite visible, but with the filter, everything just jumped out and grabbed you. I could see so much detail. That is what astonished me. It is by far, better than the Orion UHC. I'm not putting down the Orion filter. It's just that this new filter I have brings so much more detail out. The Orion pretty much just enhanced what you could already see without a filter, not providing any appreciable detail.

    We then put the filter in the C14, and the Wow factor went from 10 on the 10 scale to about a 20 on the 10 scale. Yeah, I know that is stupid to say, but the view was incredible. Details seen in the C14 were putting what I had just seen with my 4 incher to shame. You could see so many wispy featherlike features. My friend then scanned over to 6960, and what a neat looking thing. I could only make out the bright star and the part that looks like the star is spewing something in a stream that looks like a very straight "S""

    I plan on purchasing another filter from Astronomik, an OIII filter in 2 inch format. I will report on the use of that filter also. I will be using my 4" APO refractor, and hopefully that C14 will also be available for comparison. I will probably acquire a few more filters to enhance my DSO viewing pleasure, and will provide my very unscientific view of how the filter worked. Since I have only used Orion UHC and Sky glow filters, I have basically no experience. So don't expect much other than yes, it helped, and how much, or it was a flop. Caley
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    Default Re: Nebular filters for visual observations: some useful links and infos

    Mi trovo Bene con un IDAS da 2" P2

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    Default Re: Nebular filters for visual observations: some useful links and infos

    Thought I would tack on a link to an interesting paper I found about filters. (JG please delete if this is already posted somewhere else here)

    http://www.karmalimbo.com/aro/report...20Thompson.pdf
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    Default Re: Nebular filters for visual observations: some useful links and infos

    Quote Originally Posted by MistrBadgr View Post
    Thought I would tack on a link to an interesting paper I found about filters. (JG please delete if this is already posted somewhere else here)

    http://www.karmalimbo.com/aro/report...20Thompson.pdf
    Hello Bill,

    Jim Thompson is one of the most comprehensive sources of information on the filters for the hobby astronomy.
    I appreciate very much that you have put the link to his *.pdf in the discussion.
    Been mit Jim in a short e-mail contact pretty long ago - during the time when Karmalimbo at Abbey Road has been dead on the web.

    Thanks,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS; Astrophotography: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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