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Thread: Non-Standard Visual Filters for Planetary Observing with Small Aperture Telescopes

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    Default Non-Standard Visual Filters for Planetary Observing with Small Aperture Telescopes



    An article on different filters that some may find interesting or helpful
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    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/Achro thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)
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  2. The Following 5 Users Say Thank You to Gabby76 For This Useful Post:

    j.gardavsky (05-11-2018),mstar74 (05-11-2018),not_Fritz_Argelander (05-11-2018),SpyderwerX (05-11-2018),TheFatKitty (05-21-2018)

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    Default Re: Non-Standard Visual Filters for Planetary Observing with Small Aperture Telescope

    Interesting article, thanks.
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    Default Re: Non-Standard Visual Filters for Planetary Observing with Small Aperture Telescope

    An interesting observer that I met while in Alberta, he is the person that got me using the FL-D as a Mars filter.
    He is also helped designed the original Stellarvue colour balanced MV/IR filter.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/Achro thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)
    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: Non-Standard Visual Filters for Planetary Observing with Small Aperture Telescope

    Very interesting and informative article, Gabby. Thanks for posting it. I have a Celestron eyepiece and filter kit, but haven't found any of the filters in it particularly helpful for the planets. I'll give his suggestions a try (hopefully with better results).
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    Gene

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    Default Re: Non-Standard Visual Filters for Planetary Observing with Small Aperture Telescope

    Great article! Thanks, Gabby!
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    Default Re: Non-Standard Visual Filters for Planetary Observing with Small Aperture Telescope

    Hello all,

    this is a very important article as linked by Gabby, especially regarding the use of the photographic filters for viewing the planets.
    I have all these listed filters from B+W Schneider (Kreuznach, Germany), which is using the Schott standard glass materials. Schneider makes the multicoatings and the filter threads, as the added value.

    Also very important is the recommendation of the magenta Fl-D filter for the coming opposition of Mars.
    Next to the Fl-D, I have also a set of other magenta filters, which have been manufactured upon my order in the past.
    There used to be good times when you have specified a filter you believe to need, and Schneider has made it.

    The rule of thumb says, take the complementary color filter to the colors of the planetary details to enhance the contrast. In case of the orange/red GRS on the Jupiter, it is the blue 470nm band-pass filter.

    Other bandpass filters and interference bandpass filters which are even better suited, can be found on the eBay in the accessories for the microscopes. However, their typical drawback is the low transmittance, so they find their use on the large apertures.

    Best,

    JG
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    Default Re: Non-Standard Visual Filters for Planetary Observing with Small Aperture Telescope

    So what about these filters in fast, large aperature reflectors?
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    Default Re: Non-Standard Visual Filters for Planetary Observing with Small Aperture Telescope

    I’d give them a try. Since they are colored filters rather than interference filters I don’t think the f ratio matters much.
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    Default Re: Non-Standard Visual Filters for Planetary Observing with Small Aperture Telescope

    Quote Originally Posted by not_Fritz_Argelander View Post
    I’d give them a try. Since they are colored filters rather than interference filters I don’t think the f ratio matters much.
    PS More aperture always helps. Filters using interference technology may have f ratio limitations since the angle of the light cone needs to be considered along with the thickness of the interfering layers. One of the things I like about these transmission curves is that the desired colors are enhanced w.r.t. the rejected colors which are only mildly suppressed. This should present a great advantage in smaller or larger scopes over the usual color filters.
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    Default Re: Non-Standard Visual Filters for Planetary Observing with Small Aperture Telescope

    Just found brand new 81A, 82A , FL-D 46mm Hoyt filters on eBay. .... They even arrive before my scope!
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