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  1. #1
    j.gardavsky's Avatar
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    Default Nebular Filters: Jim Thompson at ARO back onweb



    Hello all filter freaks,

    Jim Thompson's review at ARO is again available with those phantastic filter curves,

    The ARO - Filter Research - DeepSky Intro

    It seems to be updated,
    best

    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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  3. #2
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    Default

    Thanks for the heads up, JG !

    Those graphs are really good.


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    Default

    Good research paper, but I wish he would have itemized which filter was designated for which of his two scopes, the 8" SCT or 80mm refractor. I can make a good guess at it based on the supplied graphs. I would tend to think most of the filters will be used with the SCT since it has more aperture for DSO viewing.
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    j.gardavsky's Avatar
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    Default

    Hello John, hello all,

    a successful application of the filters depends on a careful matching the exit eye pupil, the magnification, and the field of view. This is even more important than the size of the scope, contrary to most reports.

    With the narrow band filters, the 5nm and 8.5nm transmission bands push out the typical suburban light pollution levels in a practical invisibility.

    Most of the large nebulas with at least 10 arcmin across show their best in the rich field scopes. The smaller planetary nebulas can be more easily observed in the long focus scopes, like the SCT, wher you'll need both the high magnification and a larger optics size.

    Best

    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

    Jim Thompson has a lot of filter info available on his website. Since he is a Mallincam fan I reviewed a lot of his video tests and used them to decide which filters to use for my Mallincam. Saved me some expensive trial and error. Using the right filters has really expanded and improved my Mallincam viewing. He frequently posts on the Mallincam forum on yahoo and often responds to specific filter questions relating to the Mallincam. Really good guy. Len
    Len
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