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  1. #1
    Moreflying's Avatar
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    Default Filter questions lrgb & narrowband



    There are so many lrgb sets to choose from. I'm Guessing you get what you pay for. I don't want filters that have to be replaced in a few years, have halos or other issues that I've read about. The bottom line is what is your choice for lrgb sets. I don't want to go bottom of the line here. On the other hand, I don't want to spend excessive $ if its not necessary.

    Also..as far as narrowband goes can you mix and match or should one stick with mached sets. For example some are 12nm while others are 6 to 7 nm. They also appear to have different looking coatings. For example, some Ha filters appear red while others are yellow. Does this make any difference? Thank you!

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    Moreflying's Avatar
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    Default Re: Filter questions lrgb & narrowband

    Okay... I'll rephrase. What are considered the top shelf filters out there. I don't know....maybe this question is like asking what kind of car you like.

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  3. #3
    Tim K's Avatar
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    Default Re: Filter questions lrgb & narrowband

    I'd avoid any mix-n-match buying because vendors use different thickness glass and it will affect the focus. For example Astronomik filters are fairly thin, 1mm thick, while IDAS two-piece filters are 4 mm. Astrodon is in between at 3 mm! Decide on one vendor and buy the entire set in the same thickness.

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  5. #4
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    Default Re: Filter questions lrgb & narrowband

    Astrodon are the best but they are super expensive so it's a choice between Baader & Astronomic.
    Look at the transmission graphs & see if that's what you want.
    Make sure you don't have gaps between the RGB curves.
    My flickr photos:
    See Allan's astro photos on flickr

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  7. #5
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    Default Re: Filter questions lrgb & narrowband

    Quote Originally Posted by alpal View Post
    Astrodon are the best but they are super expensive so it's a choice between Baader & Astronomic.
    Look at the transmission graphs & see if that's what you want.
    Make sure you don't have gaps between the RGB curves.
    Hello all,

    just to add a short comment.
    With the DSLR cameras, the Baader interferometric CCD RGB set is quite interesting, as the green and red filters do not overlap at the orange Hg and Na lines of the light pollution, making a very narrow, but still acceptable gap killing some of the light pollution. On the other hand, the blue and green filters overlap at the OIII lines, around 500nm, and this is the 'swimming pool color wavelength' at which some of the DSLR cameras are less sensitive. Hence the color rendition of the nebulas may come out slightly better. These Baader filters also have transmissions close to 98%.
    (One remark for the visual observers: The green and the blue interferometric CCD Baader filters can be stacked to obain an excellent medium pass-band visual OIII filter, which will win over most of the visual OIII filters on the market, if not over all of them. The blue interferometric CCD Baader filter can be stacked with the UHC Astronomik filter to get in fact again the best OIII & H-Beta pass-band filter, killing the red pass-band around H-Alpha - I am using this trick sometimes.)

    Regarding the narrow-band nebular filters, again a parfocal set is most practical. The narrow-band filters require long exposure times, which may add to several hours in total. The balanced sets of the filters, like SII, H-Alpha and OIII, are increasingly popular. Should I, then I'd save money for the extremely narrow-band nebular filters from Astrodon, and for a good CCD camera, of course.

    As with most of the accessories, you may spend on the filters as much as on your DSLR or CCD camera.

    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;
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  9. #6
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    Default Re: Filter questions lrgb & narrowband

    I'm running astronomik LRGB and baader Ha filters. I like the results so far, just wish I had clear skies. The astronomiks have the same LP gap as Baader, but you will still get ALL the LP using the L filter. I haven't had to resort to stacking a LP filter yet, but I can see it becoming a problem on longer subs, say past 10mins.
    ---Jeff---
    Explorer Scientific MN152 F4.8
    Celestron ASGT5 mount
    Starlight Xpress HX916 ccd
    Astronomiks LRGB filters
    Baader Ha 7nm filter

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  11. #7
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    Default Re: Filter questions lrgb & narrowband

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

    just to add a short comment.
    With the DSLR cameras, the Baader interferometric CCD RGB set is quite interesting,
    as the green and red filters do not overlap at the orange Hg and Na lines of the light pollution,
    making a very narrow, but still acceptable gap killing some of the light pollution.

    Best

    JG
    I agree.
    I got a free set of filters with my QHY9 mono purchase to get me up & running.
    A photo of the transmission curves is attached.
    Notice there is a gaping hole between Green & Red.
    That will be not much good from a dark site but from a city
    it will at least get rid of some sodium spectrum which is at 568 & 589 nm.
    It won't stop mercury emission.

    see graph here:
    Where the shadows lie

    I hope to post some test pics soon & we'll see.
    I also have a new Baader 7nm Ha filter & that will be interesting to try too.
    Attached Images Attached Images
    My flickr photos:
    See Allan's astro photos on flickr

  12. #8
    j.gardavsky's Avatar
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    Default Re: Filter questions lrgb & narrowband

    Hello Allan,

    thanks for the link to the 'shadows', very interesting and helpful.

    I have had a look at the spectral curves of your filters. What make are they?

    Just for the comparison, here are the Baaders:

    http://www.baader-planetarium.de/sek...urve_gross.gif

    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;
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  13. #9
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    Default Re: Filter questions lrgb & narrowband

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

    thanks for the link to the 'shadows', very interesting and helpful.

    I have had a look at the spectral curves of your filters. What make are they?

    Just for the comparison, here are the Baaders:

    http://www.baader-planetarium.de/sek...urve_gross.gif

    Best

    JG
    They are no name filters.

    I tried out my new CCD camera for the first time tonight.
    I got it to focus on all 5 filters & download pics.
    I didn't have any luck with guiding using Maxim DL & a Lodestar -
    so at the moment I am trying to learn Maxim DL but it
    is an extremely difficult program to use.
    PHD guiding is so simple to use in comparison.

    My problem is not filters - it's Maxim DL -
    the most difficult program to use that I've ever seen in my life.
    My flickr photos:
    See Allan's astro photos on flickr

  14. #10
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    Default Re: Filter questions lrgb & narrowband

    This is great info guys. Thank you! What do you guys think about these. Astrodon Tru-Balance Generation 2 I-Series - LRGB 1.25" Mounted Filter Set - OPT Telescopes

    I think I would need the "I" series for my equipment. Any thoughts?

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