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Thread: Oak 2+ 8 inch solar filter: which filter to be combined with ?

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    Default Oak 2+ 8 inch solar filter: which filter to be combined with ?



    I have a Oak 2+ (visual + photographic) 8 inch solar filter to be mounted on my Celestron EdgeHD 800 OTA.

    To improved contrast and details I probably need a proper filter to be fitted on my Baader Hyperion eyepieces.

    Which one should I choose:

    Teleskop-Express: Baader 1.25' Solar Continuum contrast filter for the Sun

    (seems to turn the image greenish....)

    or:

    H-alpha 1.25" filter..but which one: 7, 12 nm or narroband ?

    Because H-alpha filters are very expensive I also looked at this special Lunt Solar eyepiece:

    Teleskop-Express: LUNT 8mm 1,25' Okular fr Sonnenbeobachtung H-Alpha optimiert - 60 Feld

    This eyepiece is supposed to be optimized in the H-alpha wave length range. Is this a valid substitute for an expensive H-alpha filter, taking into account the usage of an Oak 2+ glass filter attached on the front of my telescope ?

    Do H-alpha filter change the observation colour of the sun, as does the Baader Solar Continuum Contrast Filter ?

    Many thanks in advance.

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    Default Re: Oak 2+ 8 inch solar filter: which filter to be combined with ?

    Hello refillmaster
    I have read the 2 links you provided . I would suggest the Baader solar continuuim contrast filter but be aware that it MUST be used along with the Oak 2+ filter you all ready have .
    The Lunt eyepiece is not a filter but an eyepiece with inhanced coatings that are designed to work well with HA filtered solar scopes . You need to have the HA solar scope first , this EP can not be used in stead of an HA etalon filter .

    Unfortunately there is no in expensive way that I am aware of to view in HA without investing in a proper HA scope or HA etalon and blocking filters . They are not cheap but I have never heard of anyone that was dis appointed with purchasing one
    olddogg60 likes this.
    Mike
    For HA Light Coronado Solarmax 60 DS with Moonlight motorized focuser , Coronado MiniMax 102
    For White Light Williams Optic Megrez 110 / Lunt wedge
    For night time C 9.25 , C8 , Vintage Meade 10" Starfinder
    For images Canon Rebel XS , Neximage 5 , Imaging Source DMK 31 AU03 AS , DMK 21 AU04 AS
    Eyepieces .........yes

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    Default Re: Oak 2+ 8 inch solar filter: which filter to be combined with ?

    Hi MG877,

    Many thanks for your reply. Yes I know I will need the Oak 2+ solar filter. I was searching for an acceptible filter to enhance the contrast in viewing the solar structures (flares/protuberans). The only con of the Baader Solar continuum contrast filter is the colour change into green....but it is significantly cheaper (just a fraction of the price) than H-alpha filters.

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    Default Re: Oak 2+ 8 inch solar filter: which filter to be combined with ?

    Hello Refillmaster

    You may want to try something like this Orion 1.25" Variable Polarizing Filter

    It is suggested to use variable polarizing filters with Herschel wedges to tone down the brightness and improve contrast , it should do the same with your Oak +2 filter .
    Mike
    For HA Light Coronado Solarmax 60 DS with Moonlight motorized focuser , Coronado MiniMax 102
    For White Light Williams Optic Megrez 110 / Lunt wedge
    For night time C 9.25 , C8 , Vintage Meade 10" Starfinder
    For images Canon Rebel XS , Neximage 5 , Imaging Source DMK 31 AU03 AS , DMK 21 AU04 AS
    Eyepieces .........yes

 

 

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