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Thread: Sourcing Out Lumicon UHC & OIII 1.25" Filters

  1. #11
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    Default Re: Sourcing Out Lumicon UHC & OIII 1.25" Filters



    Hello Gib,

    I have somehow lost the trace.
    How did you manage it with the filters? Any first light report?

    Wishing you clear skies,

    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: Sourcing Out Lumicon UHC & OIII 1.25" Filters

    Quote Originally Posted by j.gardavsky View Post
    Hello Gib007,

    congratulations. The DGM filters are an excellent choice.

    As others may also read this thread, below find the transmission curves of the very narrow-band OIII filters, including the DGM


    http://www.karmalimbo.com/aro/pics/filters/o3b.jpg

    Clearly, the DGM OIII will beat the Lumicon OIII on the fast scopes (like f/5), due to the so called blue shift of the narrow pass-bands. The reason is, the Lumicon OIII is too close to the main OIII line at 500.7nm, and the long wavelength cutting edege of the Lumicon may easily touch the emission line, or even intersect it. The difference between the both filters will be less on the slow scopes (f/8 and larger).

    The DGM NPB vs Lumicon UHC is here,

    http://www.karmalimbo.com/aro/pics/filters/narrow.jpg

    The both UHC filters are not CCD filters, and they may transmit some unwanted light in red and in UV, and as it used to have been with Lumicon, one production batch may considerably differ from the other. However besides the perfectionists, hardly anybody will worry about it.

    Looking forward to your observational reports on the DGM filters,

    JG
    Since this is well over anything I know, what is a "Fast" scope and how does one determine how fast their scope is? I hope I haven't purchased any EP that won't perform well. Obviously I am mistaken to think that an any EP will work with any scope.
    As always thanks
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    Default Re: Sourcing Out Lumicon UHC & OIII 1.25" Filters

    Hello Cookie,

    'fast' or 'slow' scope is the same notion as used with the camera optics - simply the f- or F- number. It is calculated by dividing the focal length (F) with the aperture diameter (D). Historically it comes from the fact, that highly opened short focus lenses have allowed for a fast shutter speed in the classical photography.

    The fast astronomy scopes find their use in astrophotography of th DSOs, and in the richiest field visual observing of the deep sky objects, like the large open clusters and large diffuse emission nebulae.
    The slow scopes offer as a rule a very good views of the planets, small planetary nebulae, and they easily resolve the binary stars. But there is still a mass of the DSOs which can be comfortably seen even with the slow scopes.

    There is not a fixed line dividing the scopes into the fast and into the slow ones. The F/5 scopes and the F/4 astrographs are considered as fast, the F/8, F/11, etc., are considered as slow.

    Some of the nebular filters for imaging have the so called offset of their passband, designed for the fast scopes. these filters are preferable also for the visual observations with the fast scopes. Don Goldman offers a very detailed info here, Astrodon Astronomy Filters - Astrodon Narrowband FAQ .

    Best,

    JG
    Last edited by j.gardavsky; 12-07-2013 at 07:36 PM. Reason: added info
    cookie223 likes this.
    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: Sourcing Out Lumicon UHC & OIII 1.25" Filters

    Thanks guys,
    I just downloaded the FAQ JG suggested and will go over it.
    j.gardavsky likes this.
    Equipment:
    Explore Scientific ED-102, Celestron AVX mount, ES 2" Enhanced Diagonal, Celestron Ultimate LX 2" 22mm EP, , Pentax SMC FX 8.5, 2" ES 25mm 70*, ES 18mm 18*, ES 3-6mm zoom, Celestron UHC filter, DGM 1.25" OIII filter, DGM 2" NPB filter, 2" Orion Variable Polarizing filter, Canon 7D MK II.

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    Default Re: Sourcing Out Lumicon UHC & OIII 1.25" Filters

    Thanks guys,
    I just downloaded the FAQ JG suggested and will go over it.
    Equipment:
    Explore Scientific ED-102, Celestron AVX mount, ES 2" Enhanced Diagonal, Celestron Ultimate LX 2" 22mm EP, , Pentax SMC FX 8.5, 2" ES 25mm 70*, ES 18mm 18*, ES 3-6mm zoom, Celestron UHC filter, DGM 1.25" OIII filter, DGM 2" NPB filter, 2" Orion Variable Polarizing filter, Canon 7D MK II.

 

 
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