Large refractor and Herschel wedge

Forums Sun Large refractor and Herschel wedge

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  • #617884
    Lars Lindhard
    Participant

    I would like to observe the Sun through my 7″ f/9 refractor.

    Advice is to use a 2″ Herschel wedge, as the 1.25″ makes to small an image, but is my telescope to big for this kind of observation?

    2″ wedges are made by Baader, Lunt and Lacerta (maybe others too) Lunt says: “The 2″ model performs best on refractors with apertures of 6” or less”,

    Is there a limit? Will the heat be too much for larger telescopes?

    #617887
    Dr Paul Leyland
    Participant

    Full aperture filter over the objective?

    #617888
    Dr Paul Leyland
    Participant

    Perhaps the advice indicates that the brightness of the image may still be too bright. If that is the case, a ND filter should complete the task, especially as (7/6)^2 is only 1.4 and the increased IR load will be quite small.

    Maybe consider a full-aperture filter over the objective? I have used aluminized mylar film with great success, admittedly with smaller apertures.

    • This reply was modified 1 year, 4 months ago by Dr Paul Leyland. Reason: Fix lypo
    #617896
    Eric Watkins
    Participant

    The telescope aperture could also be stopped down i.e. 4″ with all the other safety measures suggested above.

    Eric

    #617900
    Dr Paul Leyland
    Participant

    Could, but with consequent loss of resolution.

    #617909
    Lars Lindhard
    Participant

    Thank you for your advice. I will find a full-aperture filter for the objective.

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