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

  1. #11
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    Default Re: Nebular filters for visual observations: some useful links and infos



    Hello all,

    thanks to the very positive experience of Cindy (Warmwet) with the DGM NPB filter as posted in Nebula filter , here is one more link to the DGM versus Lumicon, CN FORUMS ARCHIVE Telescope Reviews: CN Report: The DGM Optics NPB Nebula Filter

    Best,

    JG
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    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

    JG, I know this thread is getting a little "long in the tooth", but it sure has convinced me that I want to go with the DGM NPB. Thanks for your contribution.

    Clear skies to you!

    Bob
    6 inch F/5 GEM mounted reflector

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    >)))))*>

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

    Hello all,

    as the Hutech IDAS filters have recently received more attention on this Forum, enclosed find please the filter curves,

    Teleskop-Express: Neu: Hutech IDAS 2' Nebelfilter LPS-V4 fr Deep Sky Fotografie This LPS V4 filter is a quite interesting middle-to-broadband UHC filter, and it can be certainly also used for the visual observations.

    Teleskop-Express: Hutech IDAS nebula filter LPS-P2 - for Canon DSLR The LPS P2 has been designed for the of the digital cameras, here Canon. In difference to the MoonSkyGlow and to the most light pollution multiband filters, which are made on a Neodymium substarte, this filter achieves the multiband characteristics with the interference dichroic layers.

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

    Hello all,

    here is a link to a free downloadable atlas of the spectral lines, http://www.ursusmajor.ch/downloads/s...-atlas-4.0.pdf , including also a very good coverage of the emission diffuse and planetary nebulae. Last but not least, it also covers the spectra of the light pollution. (I have posted this link also in the Books Forum, but it may be overseen there.)

    For anyone involved in teaching the astronomy and astrophysics, here Planetary Nebula is a nice tutorial on the planetary nebulae.

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

    Thanks JG and others for this wealth of information about filters!

    Has anyone here ever tried the DGM Optics GCE filter? "GCE" stands for "galaxy contrast enhancement." All my life (in this hobby anyway) I've been told that there is no good filter for galaxies because of their broad spectrum that includes intervals with sodium and mercury lines. My observations from urban areas supports this in that it always seems to me that galaxies suffer even more than nebulae under urban skies.

    I would appreciate anyone sharing their experience with this filter..

    Looking at the transmission plot, it compares to the Lumicon Deep Sky except the upper pass of the GCE extends more into the shorter red wavelengths, and may include the 617nm sodium transmission line.

    Here's the GCE plot:
    gce.jpg

    Ande her's the Lumicon deep sky plot (includes notations for sodium and mercury lines):
    lumicon-photo-chart-revsd.jpg

    Thanks in advance,

    Dave

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

    Hello Dave,

    I don't have my own experience with the GCE, DGM, or Lumicon Deep Sky filters.

    Regarding the galaxies, I am still experimenting with the filters.
    Galaxies with the bright star birth regions, like the M33, and galaxies with the cores surrounded by the ionized Hydrogen, like the NGC 278 in Cassiopeia, respond well to the UHC filters. Here, I a m also increasingly using the blue(RGB)CCD Baader filter, Teleskop-Express: CCD Filter blue 2' - Interference filter . This filter blocks about 2/3 of the light pollution,but it passes the OIII dublet, and the H-Beta, -Gamma, -Delta, increasing herewith the visibility of the ionized gas clouds. It also passes the bluish light of the OB star associations in the spiral arms. The applicability should hold also for the Seyfert galaxies, but I am still not through with my tests.
    Quite helpful is the yellow color filter, which increases the contrast of the cores, like in the NGC 2903 in Leo, and of the dark lanes, like in the Andromeda Galaxy M31.
    The Baader Moon SkyGlow (Neodymium) filter may pull some galaxies out of the sky background, like the fainter galaxies in the M81 group, and it slightly increases the contrast of the outer halo to the core, like on the M81.

    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

    Thanks JG!

    I went ahead and bough the GCE. I will report back first chance I get.. Probably on M31 from suburban skies, which could be a good test! I also ordered the Lumicon Deep Sky and hopefully will have it soon.

    I'm thinking the UHC is probably good enough for visual. It is transmission is similar to the Lumicon D.S., except the Lumicon also passes the deep red (good for H-alpha/H-2 regions). The GCE filter from DGM is similar to the Lumicon, except the transmission goes back up sooner in the lower red (about 90% @ 615nm).

    All the best,

    Dave

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

    Thanks JG!

    I went ahead and bough the GCE. I will report back first chance I get.. Probably on M31 from suburban skies, which could be a good test! I also ordered the Lumicon Deep Sky and hopefully will have it soon.

    I'm thinking the UHC is probably good enough for visual. It is transmission is similar to the Lumicon D.S., except the Lumicon also passes the deep red (good for H-alpha/H-2 regions). The GCE filter from DGM is similar to the Lumicon, except the transmission goes back up sooner in the lower red (about 90% @ 615nm).

    All the best,

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

    Hi All,

    After waiting patiently for the skies and Moon to clear to test the GCE, and I gave it a shot last night. If I learned anything, it is how difficult it would be to do a fair comparison of nebula filters from my home in Pinellas County, Florida.. I am going to get a pass for a near-by state park so I can make quick trips out to somewhat less light polluted skies. Honeymoon Island and is a barrier island that is by no means an escape from the urban light pollution; however, it should prove much better than from my own yard and yet, it should still prove to be a challenging test for nebula filters!

    At any rate, last night was clear, but the seeing was average to poor. The most power I could reasonably put on Jupiter was 140X. A look at Sirius at high power (530X) yielded airy disk with rings that were visible for short intervals and always very distorted, even after having the scope sit for almost an hour to equilibrate.

    I pressed on with two tests (actually, three if you count looking at a HP sodium streetlight through the filter ). The first was observing M42 both with, and without the GCE filter. The only difference I saw was that the background appeared darker; I could not see more of the nebula itself or more detail in it; however this may have been due to the seeing. I looked at it with the 18mm, 24mm, and 30mm oculars (noted at the end of this report).

    I also tried it on M46.. Yes, that's right, M46 the open cluster.. The reason being was that although I could see the cluster (without the filter) I could not see the little planetary nebula NGC 2438 that appears embedded within the cluster. This happens to be a favorite O.C. of mine, because it consists of a tight group of fine glittering stars that looks as if one of its own exploded (when you can see the P.N.). So, I thought, maybe the filter would pull it out.. nope. I blame the poor seeing.

    As far as the "sodium street light test" goes, we have a number of the high pressure sodium street lights in the area, including right down the street. Looking at it through the filter it appears a relatively deeper red. This make sense if you take a look at the transmission plot (attached to an earlier message in this thread) we're probably seeing a heavy influence from the 617nm sodium line. I am wondering how the Lumicon DS will compare being that according to its plot this line should be rejected.. we'll see.

    It looks like it may calm down a bit tonight so maybe I'll try again. Maybe if the seeing is better we can see a difference, and if the filter makes a difference in pulling NGC 2438 out of M46, well then we really have something!

    Equipment used:

    Telescope: Zhumell Z10 10" F5 Newtonian

    Filter: DGM Optics GCE 'galaxy' filter (2")

    Oculars:
    • TeleVue 2X Barlow (for star test)
    • Explore Scientific 82 WF 4.7mm (for star test)
    • Zhumell stock 9mm (Jupiter)
    • Explore Scientific 82 WF 18mm (filter test - M42, M46)
    • Explore Scientific 82 WF 24mm (filter test - M42, M46)
    • Zhumell stock 30mm (filter test - M42, M46)


    Clear Skies,

    Dave
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  13. #20
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    Default Re: Nebular filters for visual observations: some useful links and infos

    Hello Dave,

    thanks for the first light through the GCE filter.
    The gain on the nebulae through this filter won't be as high as through the nebular filters.
    However, where this filter may become helpful are the galaxies. As the Ursa Major and the Canes Venatici are rising, these constellations may offer a choice of the galaxies to test the GCE filter performance.

    Depending on your tests, I'll consider more seriously a purchase of the GCE filter.

    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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