Page 1 of 3 123 LastLast
Results 1 to 10 of 27
Like Tree38Likes

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

  1. #1
    j.gardavsky's Avatar
    j.gardavsky is offline Super Moderator
    Points: 109,346, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.6%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points365 Days+ Registered Achievement!
    Awards:
    3rd Most Active Award
    Join Date
    Feb 2011
    Location
    Germany
    Posts
    14,234
    Points
    109,346
    Level
    100
    Thanks
    14,241
    Thanked 8,662x 5,640 Posts

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



    Hello all,

    as the information on the nebular filters seems to be scattered through a mass of the former threads, please find below some links on the choice and use of the nebular filters for the observations of the emission diffuse and planetary nebulae.

    1. The main spectral emission lines of the diffuse and planetary nebulae, and of the spectral lines in the light pollution can be found here: Filtertransmission , Nebelfilter , Helium, argon, neutral oxygen and other bands in narrowband imaging

    2. The nebular filters are specified with their band-pass half-width, spectral filter curves, and maximum transmissivity: Astronomical filter curves , The ARO - Filter Research - DeepSky Intro The filter curves of the OIII filters are here OIII-Filter , of the UHC filters are here UHC-Filter, and of the H-Beta filters are here Hbeta-Filter . Note also the so called leakage = the unwanted transmission pass-bands which may pass some light pollution. The published filter curves date back, today's filter technologies may offer a better performance. A newer filter shootout is here, wpo-spectroscope tests deepsky/OIII filters .

    3. The quality variation from one filter batch to the other one has been documented here: Astrofilter Spektren im Vergleich - Zubehör / Okulare / Filter / sonstiges - Astrotreff-Deep-Sky - Das Astronomie Forum
    Some filter technologies, like the dichroic sandwich by Lumicon may suffer from aging. Check always carefully the warranty conditions.

    4. The filter performance on different nebulae is one of the most discussed subjects, and a popular read is here: Filter Performance Comparisons - Article . The H-Beta "objects" can be found here CN FORUMS ARCHIVE Telescope Reviews: List of objects to use H-beta filter on

    5. It is always helpful to read the opinions on the filter performance: Lumicon,Astronomik OIII,UHC filters Opinions sought. [Archive] - IceInSpace , Astrotreff - Astronomie Treffpunkt - OIII Filtervergleich , Baader OIII ,
    OIII filters - which is the best? ,
    Telescope Reviews: Astronomik OIII Filter Vs. Competitors?
    Baader H

    6. Some less known filters may offer a very good performance, CN Report: The DGM Optics NPB Nebula Filter - CN Report , Telescope Reviews: Denkmeier filters . The budget filters need a closer look, like here Lab Test and First Light Report of 2" Zhumell Filter Set - Review

    7. Some problems with the filters and filter making/delivery have been reported here, Lumicon Returns - News from Sky & Telescope - SkyandTelescope.com , Astrotreff - Astronomie Treffpunkt - Qualittsprobleme bei Thousand Oaks OIII?

    The necessary (but not sufficient) condition to use the nebular filters more efficiently is the dark adaptation of the eyes.

    When looking at a nebula, find out the range of the sweet magnifications, and of the sweet exit pupils. Small exit pupils at high magnifications may reveal finer details, large exit pupils at low magnifications may show the fainter outer regions surrounding the core of the nebula.

    Don’t hesitate to take different filters, like the UHC, OIII, and H-Beta, even if the published rankings would suggest just one filter. Different filters may show different details. This is quite important when sketching the nebulae.

    Contrary to the repeated educated opinion, you can use the nebular filters on the bright nebulae also with the binoculars. Some binoculars have 1.25" filter threads in the eyepiece barrels, or the filters can be fastened with some DIY help. Freaks hold a pair of the nebular filters close to their otherwise unaided eyes to see the North America Nebula (OIII), or the California Nebula and the Barnard's Loop (H-Beta).

    Enjoy the Universe of the nebulae through the filters,

    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
    Astronomy Forum Rules and Terms of Service
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  2. The Following 14 Users Say Thank You to j.gardavsky For This Useful Post:

    + Show/Hide list of the thanked

    arsene37 (08-26-2013),Asterion (12-25-2015),Astroboy999 (08-19-2013),Betelguese007 (12-07-2014),BobDob (10-25-2013),fido (08-18-2013),FWMac (08-28-2013),johnrfeeney (08-19-2013),khalid (03-10-2014),leebca (11-13-2013),njjmfm (08-28-2013),Peppy2 (01-04-2014),Rob357 (08-19-2013),_Dubhe (08-19-2013)

  3. #2
    fido's Avatar
    fido is offline Main Sequence
    Points: 2,157, Level: 29
    Level completed: 57%, Points required for next Level: 43
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!First 1000 Experience Points365 Days+ Registered Achievement!
    Join Date
    Jul 2013
    Location
    Minneapolis
    Posts
    75
    Points
    2,157
    Level
    29
    Thanks
    4
    Thanked 11x 11 Posts

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

    Last summer I picked up some filters (Orion Sky Glow and Jupiter) when these were on sale. I'll have to remember to try them out now. (^_^)

    The nebula related filters were pretty complex. I couldn't estimate if these would be useful at all. There wasn't any obvious cost/benefit curve to me either. So, I'm still waiting to figure that out later before ordering any.

  4. #3
    fogfire's Avatar
    fogfire is offline HYPER GIANT
    Points: 51,092, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience Points400+ Posts Achievement100+ Threads Achievement!
    Join Date
    Jun 2011
    Location
    Lynnwood WA, USA
    Posts
    3,200
    Points
    51,092
    Level
    100
    Thanks
    1,408
    Thanked 1,682x 1,047 Posts
    Blog Entries
    4

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

    Lots of good info here! Thanks

    I would add the Huetech LPS filters.. They are selective in removing key LP spectrum and trying to leave colors intact
    Hutech Astronomical Products - Light Pollution Suppression Filters
    j.gardavsky and khalid like this.
    Ken H. sharing the sky with my 9yr old daughter
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    ZEQ25GT - w/Meade 10" SN F4 1000MM "BIG Linda!" * w/Astro Tech AT65EDQ "Tiny Rosa"
    4SE & 6SE to be named *
    Meade Star Navigator 102 "Blue Bird" Daughter's
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Lynnwood Sky Guess
    Check out my most recent Blog "Ken's Personal Update - 4-2-2013"

  5. The Following User Says Thank You to fogfire For This Useful Post:

    khalid (03-10-2014)

  6. #4
    KT4HX's Avatar
    KT4HX is offline HYPER GIANT
    Points: 100,337, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 97.0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!1000 Days+ Registered Achievement!200+ Posts Achievement!
    Join Date
    Dec 2008
    Location
    Virginia
    Posts
    11,742
    Points
    100,337
    Level
    100
    Thanks
    1,413
    Thanked 8,061x 4,344 Posts
    Blog Entries
    200

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

    Excellent info JG. Thanks for bringing up the issue of using filters with smaller apertures. I have read a lot of people state that narrow-band filters are not useable with smaller apertures. That is just not true. But, they may not be effective on all objects using smaller apertures. Like yourself, I have used them effectively with binoculars, 4 and 5 inch scopes, on up to my Z10 and 17.5 inch dob. To be certain, the more light you can pull down the better, because of the filter's overall dimming effect. However, one should never hesitate to give them a try no matter what the aperture, with the understanding that your results will not be the same for every object. The observer needs to learn how and when to apply them to get the best results, and that is an experimentation process, which can be quite a fun and interesting endeavor.
    j.gardavsky, DB9, Lowjiber and 2 others like this.
    Alan || My DSO Blog:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    ---------------------------------------------------------------------------
    Astro Sky 17.5 f/4.5 Dob || Apertura AD12 f/5 Dob || Zhumell Z10 f/4.9 Dob
    ES AR127 f/6.5 and ES ED80 f/6 on Twilight-II Mount
    ES 82° 24mm thru 4.7mm
    ---------------------------------------------------------------------------
    Astronomers: We look into the past to see our future.

  7. The Following 3 Users Say Thank You to KT4HX For This Useful Post:

    Astroboy999 (08-19-2013),j.gardavsky (08-19-2013),khalid (03-10-2014)

  8. #5
    Rob357's Avatar
    Rob357 is offline Bright Giants
    Points: 7,969, Level: 62
    Level completed: 40%, Points required for next Level: 181
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!50 Posts Achievement!
    Join Date
    Nov 2012
    Location
    Daytona Beach Florida/Sterling Alaska
    Posts
    332
    Points
    7,969
    Level
    62
    Thanks
    77
    Thanked 97x 69 Posts

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

    Great Info, Thanks JG!

    Rob
    j.gardavsky likes this.
    USA COL Retired
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , HAM Radio W4RAA, Private Pilot, Amateur Astronomer, LX90 ACF 10", Meade LX 850 130mm Triplet APO Refractor, IOptron 90mm SCT/GoTo Mount, Orion SSAG/ST80mm, Canon T6i, Canon 60D, Orion ST80. Always on the lookout for something new.
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    If you don't believe the spinning thing on an Airplane or a Helicopter is not a fan just watch the pilot sweat when it stops suddenly!
    Old Helicopter Pilots never Die, They just Auto-Rotate Away.....

  9. #6
    johnrfeeney's Avatar
    johnrfeeney is offline Banned
    Points: 32,257, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Awards:
    Visitor Message Award
    Join Date
    Mar 2013
    Location
    Temecula, CA 33*31N 117*08W
    Posts
    6,298
    Points
    32,257
    Level
    100
    Thanks
    1,609
    Thanked 1,352x 1,320 Posts

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

    thank you JG - very informative
    j.gardavsky likes this.

  10. #7
    Starrancher's Avatar
    Starrancher is offline Banned
    Points: 262, Level: 5
    Level completed: 24%, Points required for next Level: 38
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!
    Join Date
    Aug 2013
    Location
    Northern Arizona
    Posts
    6
    Points
    262
    Level
    5
    Thanks
    1
    Thanked 4x 2 Posts

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

    I consider myself lucky to have gotten my LP , Nebula and Line filters from Meade before they became extinct .
    They are all great performing filters for sure .
    That said , I'm just partial to these , but that's not to say that the are superior .
    For visual use , I would start with a Narrowband aka UHC filter . IMHO , this filter will be best for the greatest variety of DSOs . The next filter to get would be the OIII or oxygen three line filter . This one some say is best for Planetary Nebulae and some prefer it on the Viel Nebula . I don't necessarily agree . A lot depends on sky conditions at any given time , so I'm always trying both to evaluate . I have logged all previous observations with what works best and at what magnification for a starting point reference , but even then may experiment a little and find on any given night another combo might work better providing a superior view .
    Then for a third filter I went with a Broadband or what would be considered an LP or light polution filter . This doesn't isolate the narrow spectrum of the Narrowband or the even more narrow spectrum of the OIII but does let more light through and can actually help out on Galaxies to a limited extent whereas the other two will only put a damper on such objects . Some DSOs will look better through the Broadband also , but then again under a pristine sky , I might opt for no filter at all after trying everything in the kit .
    It all really comes down to personal pref and the current sky conditions .
    khalid likes this.

  11. The Following 3 Users Say Thank You to Starrancher For This Useful Post:

    DB9 (10-29-2013),j.gardavsky (08-28-2013),khalid (03-10-2014)

  12. #8
    cherokee's Avatar
    cherokee is offline SUPER GIANT
    Points: 11,223, Level: 73
    Level completed: 25%, Points required for next Level: 227
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Dec 2012
    Location
    Natomas, Northern California.
    Posts
    1,096
    Points
    11,223
    Level
    73
    Thanks
    255
    Thanked 236x 203 Posts

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

    Hi JG. I just got to your thread tonight and thank you for the information you have provided. As you know I have become very interested in the use of filters while observing. Although I have the lowest cost starter filters and EP's at this time I have tried to take as much of a scientific approach to the use of them I can making notes in my logs as to their use and performance on the objects observed. Just starting out as I am this has been a very interesting and added aspect in astronomy other than just navigating and observing the sky at night.

    Cheers,
    Cherokee.
    j.gardavsky likes this.
    Randy:
    Skywatcher 10” Collapsible Dobsonian.
    CELESTRON NexStar 8SE with Fastar Secondary.
    MEADE
    NG-60SM 60mm Refractor.
    CELESTRON
    SkyMaster 15x70 Binoculars.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  13. The Following User Says Thank You to cherokee For This Useful Post:

    j.gardavsky (08-28-2013)

  14. #9
    Starrancher's Avatar
    Starrancher is offline Banned
    Points: 262, Level: 5
    Level completed: 24%, Points required for next Level: 38
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!
    Join Date
    Aug 2013
    Location
    Northern Arizona
    Posts
    6
    Points
    262
    Level
    5
    Thanks
    1
    Thanked 4x 2 Posts

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

    Theres nothing wrong with those Plossls Cherokee . That's what I use exclusively . Unless you going for a wider FOV , it's tough to beat a good Plossl . Keep in mind that exit pupil has everything to do with brightness making its way through the filter . The smaller the exit pupil , the less light . So typically those filters do best at lower powers .
    khalid likes this.

  15. #10
    j.gardavsky's Avatar
    j.gardavsky is offline Super Moderator
    Points: 109,346, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.6%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points365 Days+ Registered Achievement!
    Awards:
    3rd Most Active Award
    Join Date
    Feb 2011
    Location
    Germany
    Posts
    14,234
    Points
    109,346
    Level
    100
    Thanks
    14,241
    Thanked 8,662x 5,640 Posts

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

    Quote Originally Posted by Starrancher View Post
    I consider myself lucky to have gotten my LP , Nebula and Line filters from Meade before they became extinct .
    They are all great performing filters for sure .
    ...
    Hello Starrancher,

    I have also these old Meade nebular filters, both in 1.25" and 2", they have been sold with the transmission curves and test protocols.

    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
    Astronomy Forum Rules and Terms of Service
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  16. The Following User Says Thank You to j.gardavsky For This Useful Post:

    Starrancher (08-28-2013)

 

 
Page 1 of 3 123 LastLast

Similar Threads

  1. Nebular Filters for Binoculars - frequently asked Questions
    By j.gardavsky in forum Binoculars Forum
    Replies: 11
    Last Post: 01-17-2016, 07:16 PM
  2. Nebular Filters
    By chelseablue in forum Astronomy Beginners Forum
    Replies: 8
    Last Post: 06-19-2012, 01:17 AM
  3. Nebular Filters: Jim Thompson at ARO back onweb
    By j.gardavsky in forum Telescope Accessories Forum
    Replies: 4
    Last Post: 04-20-2012, 03:00 PM
  4. Baader Nebular Filters
    By thegaffer47 in forum Astronomy Beginners Forum
    Replies: 4
    Last Post: 03-09-2012, 09:02 PM
  5. Nebular filters and the Emission Lines
    By j.gardavsky in forum Telescope Accessories Forum
    Replies: 1
    Last Post: 11-08-2011, 01:42 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 11:37 PM.